As other said, there were PHYSICAL disks mod-1, -3, -9. So called mod-27
and mod-54 never existed as real device, only as emulated volume inside
DASD array.
How big is non-existent disk?
A 3390 device can be custom-sized, that mean number of cylinders can be
any value you choose *within some limit*. That's the point.
Mod-27 is anything up to 32760 cyl
Mod-54 is anything up to 65520 cyl.
(see below ***)
However when you create emulated volume, you have to do with soma
disk-box (IBM, HDS, EMC, HP, STK), every box has its own features and
limitations. For example DS8k has smallest quant of disk space equal
1113 cyls. So when you define full 32760-cyl device you LOOSE some disk
space. So, sometimes disk box causes you to choose non-maximum values.
BTW: "the rest" of array group can be small, for example 1410 cyl - you
can create such custom sized volumes.
Also note, the variety of volume sizes is not the best idea, KISS. It's
easier to clone equal volumes.
(***)
EAV
Mod-54 is some architecture maximum. The limitation was relieved by
using EAV (Extended Addressability Volumes). Such EAV is good old mod-54
(with 65520 cylinders) PLUS some special space available to most
datasets but under slightly different rules. One of differences is
allocation chunk: under 65520 it is track, over 65520 it is 21-cylinders
cluster.
EAV volumes were limited to 223GB (again, some maximum number of
cylinders), now it is raised to 1TB.
HTH
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2015-11-18 o 17:59, Jasi Grewal pisze:
Greetings, I would like to know, if there are any standard sizes for 3390-27's
because I read different manuals and each of them refers as either 30015 Cyl or
32760Cyl for Mod 27's.
Would like to hear your setup of Mod 27's and if you are using 30015 or 32760
Cyl for Mod 27's.
Here's the two manuals that states two different settings for mod 27's:
http://www.scribd.com/doc/51615339/IBM-Mainframe-Disk-Capacity-Table#scribd
http://www.redbooks.ibm.com/redpapers/pdfs/redp4187.pdf
Model Cylinders Tracks Bytes/volume Bytes/track
3390-1 1113 16695 946 MB 56664
3390-2 2226 33390 1.89 GB 56664
3390-3 3339 50085 2.83 GB 56664
3390-9 10017 150255 8.51 GB 56664
3390-27 32760 491400 27.84 GB 56664
3390-54 65520 982800 55.68 GB 56664
Then this manual states 30015 Cylinders:
http://www-01.ibm.com/support/docview.wss?uid=tss1prs4558&aid=1
Thanks in advance,
Regards,
Jasi Grewal.
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