>So, have you migrated to devclass FILE?
I have migrated most of primary pools to devc/stgpool FILE and found
them perfect (it was done as a preparation to use de-duplication in 6.x, by the
way am still 5.5.4). It is good from any point of view(backup, restore, making
tape copies, etc). There is only one big disadvantage - cost of solution. By
the way, with future de-duplication we are going to gain something in cost as
well.
> For folks that are using devclass FILE, what values did you use for MAXCAP
> and/or MOUNTLimit? How do you calculate/arrive at these numbers?
> Pro/con's for just letting the system determine MAXCAP?
I was trying to find some information about calculating correct MAXCAP
without any success. I think suitable MAXCAP is 32GB, 64GB, 128GB or 256 GB. I
formated all primary pools with 64GB volumes and found no problems. Using
bigger volumes can cause some problems. For example, it can limit number of
mounts (parallel operations) - for volumes 256GB in 2TB storage pool number of
mounts is limited to 8, because there is only 8 volumes in storage pool. I
think values for MAXCAP and MOUNTLIMIT totally depend on size of storage pool
and required number of parallel operations (backup and restores). KEEP IN MIND
- MOUNTLIMIT is working only if there is enough volumes with status FILLING or
EMPTY. FULL volumes can be mounted only for restore operations. Of course,
problem can be resolved by creating required number of empty volumes, if there
is no limit in storage pool size, but it is a dream of every admin.
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