W dniu 2014-11-18 o 15:17, Hervey Martinez pisze:
Just wondering if any of you out there have converted your Mainframe's HSM ML2
from tape to disk? If so, what are the pitfalls? A quick search of Google did
not yield much; so, just wondering if anybody has done this.
Why on disk?
What is your goal?
Some thoughts:
* If you have enough disk space you can use ML1 and never migrate to
ML2. BTDT.
* Virtual tape is some kind of disk, so ML2 on virtual tape is actually
on disk. Depending on the solution it can be further migrated to real
tape, but it not need to.
* The pitfalls are always the same:
- disk has limited capacity, you cannot simply add some cartridges.
- disk used to be more expensive. For large capacities it is more
expensive. Over the years the "large" definition is growing up, as well
as capacities of tapes and disks.
- disk can be replicated using host-independent methods - goodfor DR.
- HSM tapes can also be replicated, so why disks?
- each HW solution has its EOL (end of live). You will have to migrate
the data to next HW.
HTH
--
Radoslaw Skorupka
Lodz, Poland
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