Re: Would anyone like ....
I like the idea that we are not limited to what was the physical size of the tapes. In an emulated world like Hercules, I would like to set the size of my backup file at just under what I can write to a real CD.
Especially when it comes time to separate one user's files from all the rest and deliver it to that user to take away. I had to do that manually when one of our users moved from one university to another.
Or separating one project from the rest for other to work on.
/Tom Kern
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On 10/24/2022 4:50 PM, Fish Fish wrote: Bertram Moshier wrote:
[...]
As it has been awhile and I'm new to VM/CE, one of the things
I need to know is how much data can I get on a 6250 reel of tape? With Hercules, this is user configurable and controlled by the optional "MAXSIZE=" and "EOTMARGIN=" tape drive device parameters:
*
If not specified, then basically there is no limit as far as Hercules is concerned. It will continue writing to your emulated tape drive device file until your hard drive fills up (or your job finishes, whichever comes first).
If you're just trying to refresh your memory regarding how much data one could typically fit on a REAL 6250 bpi reel of tape back in the day, the following are the values as documented by my HercGUI:
2048MB (typical 1370' 3490E cartridge)
170MB (typical 2400' 9-track @ 6250 BPI)
2048KB (~20 inches of 3490E cartridge)
128KB (~20 inches of 9-track @ 6250 BPI)
I no longer recall where I got those values from but I'm guessing they're reasonably accurate.
What other backup devices does VM/CE support beside a 6250 drive? VM/CE? I have no idea.
But Hercules supports emulation of 3410, 3420, 3422, 3430, 3480, 3490, 3590, 9347 and 8809 model tape drives.
Emulated tape drives can be defined as AWS or HET files, or OMA or TDF files, or even honest to goodness actual REAL SCSI attached tape drives. That is to say, if you have a REAL (as in an actual physical hardware device) tape drive physically connected to your system as a SCSI device, Hercules can use it. Otherwise the Hercules tape drive is emulated in the same way disk drives and card readers, etc, are emulated: by simply reading or writing to a disk file on your host [Windows/Linux/etc] filesystem.
Given there aren't real tapes, how does changing tapes work for Herc
and VM/CE? As explained above, the MAXSIZE= and EOTMARGIN= emulated tape drive device parameters control when the end-of-tape reflector is reached. As far as how the guest operating system deals with such things, I'm sure it varies from one operating system to the next. <shrug>
Hope that helps!
|
On the main Hercules page, if you scroll down about 1/2 way, you should see a section titled "PDF manuals":
*
PLEASE NOTE the disclaimer!
"The below PDF manuals are for the original 4.0 version
of Hercules Hyperion, not for this SoftDevLabs version.
At the moment however they should still be reasonably
accurate. Over time as more and more changes are made to
the SDL version however, they might not be. The official
web documentation however should always be accurate and
considered as authoritative."
Peter's PDF manuals are quite old (2015!):
*
and a LOT has changed in Hercules since the time his manuals were originally written, so there are probably "edge case" details that are incorrect/inaccurate in a few places here and there, but the BULK of how Hercules works and how to use it, etc, should still be reasonably accurate (although I admit to not having referenced them in such a long time I don't really know that for sure).
But for someone trying to learn Hercules, they should definitely be good enough I would think.
Hope that helps!
--
"Fish" (David B. Trout)
Software Development Laboratories
mail: fish@...
|
Re: Would anyone like ....
Bertram Moshier wrote: [...] As it has been awhile and I'm new to VM/CE, one of the things
I need to know is how much data can I get on a 6250 reel of tape? With Hercules, this is user configurable and controlled by the optional "MAXSIZE=" and "EOTMARGIN=" tape drive device parameters: * If not specified, then basically there is no limit as far as Hercules is concerned. It will continue writing to your emulated tape drive device file until your hard drive fills up (or your job finishes, whichever comes first). If you're just trying to refresh your memory regarding how much data one could typically fit on a REAL 6250 bpi reel of tape back in the day, the following are the values as documented by my HercGUI: 2048MB (typical 1370' 3490E cartridge) 170MB (typical 2400' 9-track @ 6250 BPI) 2048KB (~20 inches of 3490E cartridge) 128KB (~20 inches of 9-track @ 6250 BPI) I no longer recall where I got those values from but I'm guessing they're reasonably accurate. What other backup devices does VM/CE support beside a 6250 drive? VM/CE? I have no idea. But Hercules supports emulation of 3410, 3420, 3422, 3430, 3480, 3490, 3590, 9347 and 8809 model tape drives. Emulated tape drives can be defined as AWS or HET files, or OMA or TDF files, or even honest to goodness actual REAL SCSI attached tape drives. That is to say, if you have a REAL (as in an actual physical hardware device) tape drive physically connected to your system as a SCSI device, Hercules can use it. Otherwise the Hercules tape drive is emulated in the same way disk drives and card readers, etc, are emulated: by simply reading or writing to a disk file on your host [Windows/Linux/etc] filesystem. Given there aren't real tapes, how does changing tapes work for Herc
and VM/CE? As explained above, the MAXSIZE= and EOTMARGIN= emulated tape drive device parameters control when the end-of-tape reflector is reached. As far as how the guest operating system deals with such things, I'm sure it varies from one operating system to the next. <shrug> Hope that helps! -- "Fish" (David B. Trout) Software Development Laboratories mail: fish@...
|
On Sun, Oct 23, 2022 at 02:33 PM, Ren¨¦ Ferland wrote:
It might be useful to download the PDF of the Hercules User Reference Guide.
A version 4 Hercules manual can be found at: I'm sure there are other places. ?... Mark S.
|
Re: Would anyone like ....
On Sun, Oct 23, 2022 at 02:00 PM, Bertram Moshier wrote:
As it has been awhile and I'm new to VM/CE, one of the things I need to know is how much data can I get on a 6250 reel of tape?
Tape files are not limited to feet of tape, but to the size of the filesystem/available space.
What other backup devices does VM/CE support beside a 6250 drive?
You can, if you have it, attach real devices, like SCSI tape drives to Hercules, and use those. I don't so I don't know the details.
Given there aren't real tapes, how does changing tapes work for Herc and VM/CE?
To define a new tape, Use the hetinit command to create an uncompressed AWS, or a compressed HET tape file. For documentation https://hercdoc.glanzmann.org/V400/HerculesOperationsandUtilities.pdf Examples: Create a new nonlabelled uncompressed tape, on a Linux system. Create a new labelled compressed tape, on a Linux system. [xmas@vm370dev tapes]$ hetinit -?HHC02499I Hercules utility hetinit - HET IEHINITT - version 4.4.1.10647-SDL-gd0ccfbc9HHC01414I (C) Copyright 1999-2022 by Roger Bowler, Jan Jaeger, and othersHHC01417I ** The SoftDevLabs version of Hercules **HHC01415I Build date: May 29 2022 at 16:31:27hetinit: invalid option -- '?'HHC02729I Usage: hetinit [options] outfile [volser] [owner]HHC02728I?? outfile?? output fileHHC02729I Options:HHC02729I?? -d??????? disable compressionHHC02729I?? -h??????? display usage summaryHHC02729I?? -i??????? create an IEHINITT formatted tape (default: on)HHC02729I?? -n??????? create an NL tape[xmas@vm370dev tapes]$ hetinit -d -n `date +%F`.UNCOMPRESSED.NL.AWSHHC02499I Hercules utility hetinit - HET IEHINITT - version 4.4.1.10647-SDL-gd0ccfbc9HHC01414I (C) Copyright 1999-2022 by Roger Bowler, Jan Jaeger, and othersHHC01417I ** The SoftDevLabs version of Hercules **HHC01415I Build date: May 29 2022 at 16:31:27[xmas@vm370dev tapes]$ hetinit -d `date +%F`.COMPRESSED.NL.HET SL0001 XMASHHC02499I Hercules utility hetinit - HET IEHINITT - version 4.4.1.10647-SDL-gd0ccfbc9HHC01414I (C) Copyright 1999-2022 by Roger Bowler, Jan Jaeger, and othersHHC01417I ** The SoftDevLabs version of Hercules **HHC01415I Build date: May 29 2022 at 16:31:27[xmas@vm370dev tapes]$ In the Hercules/OPERATOR console, enter DEVINIT cuu path/to/file
HHC01603I DEVINIT 580 tapes/2022-10-24.UNCOMPRESSED.NL.AWS
HHC00221I 0:0580 Tape file tapes/2022-10-24.UNCOMPRESSED.NL.AWS, type AWS: format type AWS Format tape file
HHC02245I 0:0580 device initialized
Then attach the tape/file to a user.
/CP ATTACH 580 MAINT 181
/13:22:58
/13:22:58 TAPE 580 ATTACH TO MAINT 181
The tape is attached to MAINT on the VM370 system, and all the tape and vmfplc2 commands and parameters work. I Hope This Helps. ?... Mark S.
|
Re: Would anyone like ....
On Sun, Oct 23, 2022 at 02:19 PM, Thomas Kern wrote:
A tape management system might need to be written too. And maybe a data compression option?
Data compressions is already in place at the Hercules level, when you create a tape. See: ? Hercules Emulator V4.00 ¨C Operations and Utilities Guide 5.16 HETINIT (Initialize an AWS or HET tape file), page 80 ?... Mark S.
|
Re: Would anyone like ....
I have been thinking about this and why VM lacked some of the basic? subsystems needed for production work. Me and my company worked for many separate organisations over 30 years. We saw the same functionality but different versions of the VM software "stack".? I think the issue was that sharing was not enabled by companies for "not core business" reasons. We are a xxxx company not a software developer.
Practically, we would probably just have raced to the current unix situation if sharing could have been enabled; multiple software choices, many of which solve the same underlying problem, each supported by an army of elite fanatics who are certain theirs is the best way forward.?
At least we all agree that xedit was the best editor, except of course for Edgar :-)
On Mon, 24 Oct 2022, 15:42 Bob Bolch, < Bob@...> wrote: VM customers started sharing modifications and utilities decades before?there was any Internet. VM's ease of use, and the availability of?VM source code with a set of build tools, meant that? VM user code sharing and distribution of features written by customers was the order of the day. Bob Bolch ?
On Mon, Oct 24, 2022 at 10:22 AM Anthony Smith < anthony@...> wrote: I am sure there are many here that worked on many similar problems. A pity that Share wasn't as popular as GitHub seems to be and that everyone seemed more concerned about sharing IP.
OH!
Your story remnided me of a second change I did to VMFPLC2.? It was an important part of determining the differences / changes. I forget what I changed, but know I did change something.
Are the Share presentations from 1981 and 1982 still available?
I can appreciate the work you did for your company.
On Mon, Oct 24, 2022, 05:08 Anthony Smith < anthony@...> wrote: Fascinating that I built much the same thing. To make it work also built a job? scheduler and something to allow security to handle access, something to issue privileged commands etc etc.
This started off under VPS and then got converted to VM. As far as I remember the lot got replaced by the VMxxxxxxxx products (secure, tape, backup, restore etc). Something about auditability and split responsibilities.
The new stuff never did handle the database backups, that continued to need custom code to create static files that could then be backed up.
It used file modify dates to do it's delta processing. We did build something that did delta processing a la "diff" but the storage requirements got large real quick. Our code storage repository? (disconnected user) did use update for diff processing (which save loads of space) when file type allowed.
I guess I am just one of the many programmers that built such things.?
Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.?
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
VM customers started sharing modifications and utilities decades before?there was any Internet. VM's ease of use, and the availability of?VM source code with a set of build tools, meant that? VM user code sharing and distribution of features written by customers was the order of the day. Bob Bolch ?
On Mon, Oct 24, 2022 at 10:22 AM Anthony Smith < anthony@...> wrote: I am sure there are many here that worked on many similar problems. A pity that Share wasn't as popular as GitHub seems to be and that everyone seemed more concerned about sharing IP.
OH!
Your story remnided me of a second change I did to VMFPLC2.? It was an important part of determining the differences / changes. I forget what I changed, but know I did change something.
Are the Share presentations from 1981 and 1982 still available?
I can appreciate the work you did for your company.
On Mon, Oct 24, 2022, 05:08 Anthony Smith < anthony@...> wrote: Fascinating that I built much the same thing. To make it work also built a job? scheduler and something to allow security to handle access, something to issue privileged commands etc etc.
This started off under VPS and then got converted to VM. As far as I remember the lot got replaced by the VMxxxxxxxx products (secure, tape, backup, restore etc). Something about auditability and split responsibilities.
The new stuff never did handle the database backups, that continued to need custom code to create static files that could then be backed up.
It used file modify dates to do it's delta processing. We did build something that did delta processing a la "diff" but the storage requirements got large real quick. Our code storage repository? (disconnected user) did use update for diff processing (which save loads of space) when file type allowed.
I guess I am just one of the many programmers that built such things.?
Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.?
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
My system did full backups of each minidisk on Sunday and then deltas for Monday through Saturday. We already had a mechanism to ask the Operators to mount a tape. I don't remember if there was any Tape Label recording. But I did not do any database of files that were backed up. We did not do enough restores to really need to check. The Operators just started with the most current tape and worked back to Sunday's tape. They were all on a rack nearby.
If SQLite3 is available on VM/CE, it might be useful for tape management and file logging. Since then I have used databases more than I did then (never) and I like them for these kinds of things and for reporting on these kinds of things.
/Tom Kern
toggle quoted message
Show quoted text
On 10/24/2022 5:38 AM, Bertram Moshier wrote: Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.
|
Re: Would anyone like ....
I am sure there are many here that worked on many similar problems. A pity that Share wasn't as popular as GitHub seems to be and that everyone seemed more concerned about sharing IP.
OH!
Your story remnided me of a second change I did to VMFPLC2.? It was an important part of determining the differences / changes. I forget what I changed, but know I did change something.
Are the Share presentations from 1981 and 1982 still available?
I can appreciate the work you did for your company.
On Mon, Oct 24, 2022, 05:08 Anthony Smith < anthony@...> wrote: Fascinating that I built much the same thing. To make it work also built a job? scheduler and something to allow security to handle access, something to issue privileged commands etc etc.
This started off under VPS and then got converted to VM. As far as I remember the lot got replaced by the VMxxxxxxxx products (secure, tape, backup, restore etc). Something about auditability and split responsibilities.
The new stuff never did handle the database backups, that continued to need custom code to create static files that could then be backed up.
It used file modify dates to do it's delta processing. We did build something that did delta processing a la "diff" but the storage requirements got large real quick. Our code storage repository? (disconnected user) did use update for diff processing (which save loads of space) when file type allowed.
I guess I am just one of the many programmers that built such things.?
Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.?
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
OH!
Your story remnided me of a second change I did to VMFPLC2.? It was an important part of determining the differences / changes. I forget what I changed, but know I did change something.
Are the Share presentations from 1981 and 1982 still available?
I can appreciate the work you did for your company.
On Mon, Oct 24, 2022, 05:08 Anthony Smith < anthony@...> wrote: Fascinating that I built much the same thing. To make it work also built a job? scheduler and something to allow security to handle access, something to issue privileged commands etc etc.
This started off under VPS and then got converted to VM. As far as I remember the lot got replaced by the VMxxxxxxxx products (secure, tape, backup, restore etc). Something about auditability and split responsibilities.
The new stuff never did handle the database backups, that continued to need custom code to create static files that could then be backed up.
It used file modify dates to do it's delta processing. We did build something that did delta processing a la "diff" but the storage requirements got large real quick. Our code storage repository? (disconnected user) did use update for diff processing (which save loads of space) when file type allowed.
I guess I am just one of the many programmers that built such things.?
Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.?
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
Fascinating that I built much the same thing. To make it work also built a job? scheduler and something to allow security to handle access, something to issue privileged commands etc etc.
This started off under VPS and then got converted to VM. As far as I remember the lot got replaced by the VMxxxxxxxx products (secure, tape, backup, restore etc). Something about auditability and split responsibilities.
The new stuff never did handle the database backups, that continued to need custom code to create static files that could then be backed up.
It used file modify dates to do it's delta processing. We did build something that did delta processing a la "diff" but the storage requirements got large real quick. Our code storage repository? (disconnected user) did use update for diff processing (which save loads of space) when file type allowed.
I guess I am just one of the many programmers that built such things.?
Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.?
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
Hi,
The software included a very basic form of tape management.? It would tell the operator to mount a new tape and how to label the one just taken down.? The software would keep track of the contents of each reel.? This way one could do a restore of an individual file or entire mini-disk.
The base delta concept helped reduce the number of tapes and files proceed each night.? Only once a month did we do an entire system, then weekly (1, 2, 3, 4, or 5), and daily.?
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
Hi,
It would really be great if someone could help me find my Share presentation on my backup program.
Also it used a base, delta method.
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
On Sun, Oct 23, 2022 at 11:44 AM, Bertram Moshier wrote:
Dasdint comnand?? Where is it located (Windows, Herc, VM Exec, etc)?
On Windows, in the installation folder of Hercules. Start a command window, and type the command at the prompt. If the folder is in your path, you should get the syntax of the command displayed. It might be useful to download the PDF of the Hercules User Reference Guide. Cheers, Rene FERLAND, Montreal
|
Re: Would anyone like ....
A tape management system might need to be written too. And maybe
a data compression option?
/Tom Kern
On 10/23/2022 3:00 PM, Bertram Moshier
wrote:
toggle quoted message
Show quoted text
Hi,
As it has been awhile and
I'm new to VM/CE, one of the things I need to know is how
much data can I get on a 6250 reel of tape?
What other backup devices
does VM/CE support beside a 6250 drive?
Given there aren't real
tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming
back, but the details are missing from my memory.? I think I
let VMFPLC2 tell me when the tape was full.? But this time
around, I'd like to do preliminary estimates.
|
Re: Would anyone like ....
Hi,
As it has been awhile and I'm new to VM/CE, one of the things I need to know is how much data can I get on a 6250 reel of tape?
What other backup devices does VM/CE support beside a 6250 drive?
Given there aren't real tapes, how does changing tapes work for Herc and VM/CE?
How I did this is coming back, but the details are missing from my memory.? I think I let VMFPLC2 tell me when the tape was full.? But this time around, I'd like to do preliminary estimates.
|
You are correct about the 3330 and 3350.? I wasn't reading DMKRIO closely.? My mistake.
Dasdint comnand?? Where is it located (Windows, Herc, VM Exec, etc)?
On Sun, Oct 23, 2022 at 11:07 AM, Bertram Moshier wrote:
>> 3350 not 3330 model 11 an 1.
To my knowledge, there is no such thing as a 3350-1 and 3350-11 and you won't see any of these in DMKRIO.
>> How do you code the model number in the configuration file?? Is that I'm the filee?
In the Hercules configuration file, you don't need to code the model (that is 11 or 1), Hercules will recognize it.
But you need to specify it if you create a DASD with the dasdinit command.
Cheers,
Rene FERLAND, Montreal
|
On Sun, Oct 23, 2022 at 11:07 AM, Bertram Moshier wrote: >> 3350 not 3330 model 11 an 1.To my knowledge, there is no such thing as a 3350-1 and 3350-11 and you won't see any of these in DMKRIO.
>> How do you code the model number in the configuration file?? Is that I'm the filee?
In the Hercules configuration file, you don't need to code the model (that is 11 or 1), Hercules will recognize it.
But you need to specify it if you create a DASD with the dasdinit command.
Cheers,
Rene FERLAND, Montreal
|
Re: Would anyone like ....
Hello Tom,
You're correct.? OCF used DDR for each drive so both used and free space was going to tape.? Restores were equally messy and were at the mini-disk and not file level.
My program was at the file level for each individual user.? ?There were two advantages:? 1) Less tape and 2) Quicker backup.? Oh, also easier restores.
We still backed up reader files completely.? All had to be restored (only happened once, while I was there).? It worked, but wasn't pretty.
Yeah, it was fun and I think writing it again might help me get back into VM.
Thanks.
When I was first promoted to Systems Programming from Application
Programming, I played with lots of stuff from the Waterloo Mods
tapes. One of the utilities was a 'TAPE' replacement that
increased the speed and functionality. I was allowed to write a
file level backup program (restores were manual) IF I could only
use the 800BPI tape drives and small tapes. It was still running
nightly when I left, having been promoted to using 1600 then 6250
BPI tape drives.
It was a lot of work and equal fun. And I realized that there is
an important difference between System Backups and File-level
Backups. Lots of Data Center Managers have forgotten that
individual files are important to the people who use them. Even if
your users are not Program Developers, they do create multiple
versions of documents and spreadsheets, files that are important
to them.
I would hope that people using VM/CE would appreciate a usable
file-level backup utility.
/Tom Kern
On 10/23/2022 9:54 AM, Bertram Moshier
wrote:
+Hi,
In 1982 and 1983, I worked for Owens Corning Fiberglas at
their Research Center in Newark, Ohio.? I was the lead systems
programmer for the VM system.
My first assignment was to create a backup system that the
operators could run (manual restore was OK).? The issue was
they were using DDR to back up their system.? They would take
the system offline each night for hours to backup it up.?
People were complaining about how much downtime the system
required to operate properly.
I wrote a backup program in a couple of weeks.? It was good
enough that several people asked me to do a Share
presentation.
The program uses EXEC2 and a small (20 lines) modification
to VMFPLC2.
IBM approached Owens Corning Fiberglas about buying it (for
US$7M over 4 years).? My boss was proud and wanted to take IBM
up on the offer.? Unfortunately, there was this Senior VP
whose attitude was "we make fiberglass?not software."? He went
on to say there had been others who wrote software IBM wanted
to buy and always said NO, PERIOD!? This is part of the reason
I left Owens Corning Fiberglas.
He felt OCF would need to create a new division to handle
the influx of money, etc., and OCF would lose money.? I talked
to the Comptroller and he disagreed about needing a new
division.? He felt the IT division could handle it all and he
liked the idea, but it was out of his hands.
OK enough for background.? Obviously, I can't reuse the
code I wrote for OCF, but why not do it again?
I'm wondering if a VM Backup program would be useful for
people using VM/CE.? I can see both reasons being yes and no.?
Thus my question about a VM Backup program for VM/CE?
Thanks.
|
Thomas Kern
Mark A. Stevens
Anthony Smith
Ren¨¦ Ferland