W dniu 02.07.2020 o 23:51, Tony Thigpen pisze:
I am seeing some DS8000s where a mod-27 is defined as 30051 cylinders.
I am seeing other sites were the mod-27 is defined with 32760 cylinders.
I know the architectural limit of a mod-27 is 32760 cylinders, but if
you work with multiples of mod-1 units, the 30051 number make sense.
I also know that when you use the DSCLI, you can specify any number of
cylinders. What I don't know is what the old GUI did.
So, some questions:
1) What size is a mod-27 in your shop?
2) Was your DASD allocated using the DSCLI or the GUI?
As other said: mod-27 32760 cyl, mod-54 65520 cyl. What I missed:
this is *MAXIMUM*.
There is no real mod-27, so this is only concept. And in real world you
have to emulate such volume on some disk array. Disk arrays allow to
make smaller volumes - not 32760, but maybe 32001 cyl. Why? Maybe
because your RAID group will be used more effectively.
Regarding DS8k - this disk array use 1113 cyl (equivalent of 3390-1) as
the smallest chunk. As far as I know you can define volume with let's
say 300 cylinders but whole 1113 chunk will be used for that. And the
rest of the chunk will be unusable. What a waste...
So, it is good idea to use whole chunk multiplication whenever possible.
And usually you don't care whether your volume is 32760 or just 32277 cyl.
Oh, I focuse on mod-27 and we also have mod-54 ...and EAV. In EAV world
there are maximum values (actually three of them), but IMHO no one care
about it.
HTH
--
Radoslaw Skorupka
Lodz, Poland
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