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Re: VM system disk arrangement
by sqrfolkdnc
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This (many volumes)has the advantage of making it easier to have a test
(clone of Disk 1) and a production system when making changes, and the
test system can even be run second level if there is a reason to do so
under Hercules, other than for demo purposes.
Having a lot of busy stuff on one volume can still be a performance
issue if CP has to queue up i/os because it knows it can't do two I/Os
to the same disk at the same time.
Thomas Kern wrote:
> I like the idea of a single iplable volume without any of the
> non-operations minidisks and then spreading out the non-operational
> minidisks across more non-filled compressed Hercules volumes.
>
> Disk 1: Iplable: MAINT(190,191,19E), OPERATOR, AUTOLOG1, CPWATCH,
> Some Temp, Tdisk
> Disk 2: Rest of MAINT's minidisk
> Disk 3: RSCS, RSCS1, CMSBATCH, Other SVMs, CMSUSER
> ALGOL, BREXX, COBOL, DOSVS, OSBASIC, PLI, PL360,
> RPG, SCRIPT, TAPEMAC, WATFIV
> Disk 4: GCCCMS
> Disk 5: ALGOL, BREXX, COBOL, DOSVS, OSBASIC, PLI, PL360,
> RPG, SCRIPT, TAPEMAC, WATFIV
> Disk 6: REGINA
> Disk 7: Temp
> Disk 8: Tdisk
> Disk 9: etc
>
> I also like putting the Waterloo Mods onto a separate volume.
>
> /Tom Kern
>
> Robert O'Hara wrote:
>
>> I am looking at reworking the arrangement of disks in the VM 5-pack system.
>>
>> I have looked at the current disk utilization of MAINT, and I believe
>> that all of his minidisks can comfortably fit on a single 3350. Also,
>> all of the VM system disks (PERM, TDSK, TEMP) can fit on a single 3350.
>>
>> Now of course on a real mainframe we would want these disks spread out
>> over several channels, but it seems to me that with Hercules it does not
>> matter. Is that a correct assumption?
>>
>> I propose:
>>
>> disk 1: PERM, TEMP, TDSK
>> disk 2: all of MAINT's disks
>> disk 3: OPERATOR, RSCS, RSCS1, CPWATCH, AUTOLOG1, CMSBATCH,
>> ALGOL, BREXX, COBOL, DOSVS, OSBASIC, PLI, PL360, RPG,
>> SCRIPT, TAPEMAC, WATFIV
>> disk 4: GCCCMS
>> disk 5: REGINA, CMSUSER
>>
>> Comments on this layout?
>>
>> Thanks, Bob
>
(clone of Disk 1) and a production system when making changes, and the
test system can even be run second level if there is a reason to do so
under Hercules, other than for demo purposes.
Having a lot of busy stuff on one volume can still be a performance
issue if CP has to queue up i/os because it knows it can't do two I/Os
to the same disk at the same time.
Thomas Kern wrote:
> I like the idea of a single iplable volume without any of the
> non-operations minidisks and then spreading out the non-operational
> minidisks across more non-filled compressed Hercules volumes.
>
> Disk 1: Iplable: MAINT(190,191,19E), OPERATOR, AUTOLOG1, CPWATCH,
> Some Temp, Tdisk
> Disk 2: Rest of MAINT's minidisk
> Disk 3: RSCS, RSCS1, CMSBATCH, Other SVMs, CMSUSER
> ALGOL, BREXX, COBOL, DOSVS, OSBASIC, PLI, PL360,
> RPG, SCRIPT, TAPEMAC, WATFIV
> Disk 4: GCCCMS
> Disk 5: ALGOL, BREXX, COBOL, DOSVS, OSBASIC, PLI, PL360,
> RPG, SCRIPT, TAPEMAC, WATFIV
> Disk 6: REGINA
> Disk 7: Temp
> Disk 8: Tdisk
> Disk 9: etc
>
> I also like putting the Waterloo Mods onto a separate volume.
>
> /Tom Kern
>
> Robert O'Hara wrote:
>
>> I am looking at reworking the arrangement of disks in the VM 5-pack system.
>>
>> I have looked at the current disk utilization of MAINT, and I believe
>> that all of his minidisks can comfortably fit on a single 3350. Also,
>> all of the VM system disks (PERM, TDSK, TEMP) can fit on a single 3350.
>>
>> Now of course on a real mainframe we would want these disks spread out
>> over several channels, but it seems to me that with Hercules it does not
>> matter. Is that a correct assumption?
>>
>> I propose:
>>
>> disk 1: PERM, TEMP, TDSK
>> disk 2: all of MAINT's disks
>> disk 3: OPERATOR, RSCS, RSCS1, CPWATCH, AUTOLOG1, CMSBATCH,
>> ALGOL, BREXX, COBOL, DOSVS, OSBASIC, PLI, PL360, RPG,
>> SCRIPT, TAPEMAC, WATFIV
>> disk 4: GCCCMS
>> disk 5: REGINA, CMSUSER
>>
>> Comments on this layout?
>>
>> Thanks, Bob
>
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