FWIW
I've got three pools on 3590E drives and a mix of J and K tapes (20/40GB raw)
One is for large backups from our SAP system (150GB raw each, about 55GB
compressed at the drives). Because of their size reclamation is unproductive
in this pool.
One is for log term (> 6 months) archives. Most of this is the monthly
archives that management insists we do and are kept for 400 days, but some of
it is "retain forever". The data on these tapes tends to expire all at once so
that reclamation is quite efficient when run infrequently - once a month or so.
One is for the rest. I try to let as much data expire as possible. I only run
reclaims on this pool once per week and set the reclaim percentage at 80%,
because the most efficient reclaim is the one you don't do. Average tape
utilization on full tapes in this pool is about 47% at the moment.
So, the best mix depends not on the source of your data, but on its expiry
characteristics. In general a single pool works well, but where there are
specific cases it can be wise to split them out.
HTH
Steve Harris
AIX and TSM Admin
Queensland Health, Brisbane Australia
>>> znoriega AT ADNOC DOT COM 04/08/2003 19:28:05 >>>
Hi to all,
What is the best practice of using copy storage pool for offsite tapes? In
our site, we used different copy storage pools for archive, backup and tdp
backups, but it too expensive in terms of media used. Space reclamation
also takes all the drives if they are running on the same. Can I use one
copy storage pool for all? Any help from you is really appreciated.
Thanks
Zosimo Noriega
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