W dniu 2018-05-23 o 17:39, Mike Baldwin pisze:
[...]
> Thanks for reading this far! Did I kill the thread?
No! Not at all.
> A couple of the largest VTL vendors only support 3490
Well, can we enumerate the VTL vendors? IMHO all of them would be happy
to see its name on the list, while it's still no advertisement.
Let me begin:
IBM TS7700 - does it support 3590 emulation? What volume sizes available?
VISARA Vi-5990 - according to Ken's informaton it does support 3590
emulation, any volume size.
STK/Oracle VSM - only 3490?
EMC DLm - ???
what else?
Another thread:
Assuming maximum virtual volume size does NOT depend on emulation type
(which is a case for VISARA) - what is an advantage of having 3590 over
3490? And the opposite - what's wrong with 3590 emulation?
Compatibility: since both emulated 3490 and emulated 3590 are VIRTUAL
and exist only inside VTL what problems could happen with "incompatible"
drives? IMHO VISARA 150GB virtual volume is incompatible with Oracle VSM
virtual volume despite of emulation type, however in any case it is
perfectly possible to move data from one tape system to another. The
largest (actual) volume size matter.
Optimal maximum volume size for HSM:
There are some limitations in HSM which do not allow to backup very
large datasets because maximum number of tapes used for dump is limited
to 254 (it was 40 in the past!). That clearly say the small volume size
could pain.
What about upper values? Is it good or bad to have huge volumes? I'm
using 4/12TB volumes (real TS1140) and see nothing wrong with it. Of
course I cannot make the volume smaller4 times (yes, I know there are
sport cartridges, but I have normal ones).
Getting back to VTLs - what would be wrong in using (potential) 12TB
virtual volumes for HSM?
I do not insist on 12TB, but I'm trying to understand what the optimal
value is and why.
Regards
--
Radoslaw Skorupka
Lodz, Poland
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