Hi Barton,
I not quite understand what you have wrote, but you mentioned that
you might decides to go for one storage pool instead of multiple.
Based on one storage pool, you might faces the problem we have currently
i.e. firstly, your migration will be slow if you have a staging disk
pool although you might triggle off multiple migration processes.
Second, your reclaimation will be slow as only one reclaimation process
is allow for one storage pool. ( This is based on what I know and there
might be
Barton, Pina wrote:
> Hi,
> We are considering redesigning our storage pools because of problems
>
> we've had and to simplify our environment. Here's our current
> environment (server is AIX 4.1.4 ADSM 2.5.1.12):
>
> SSA #1 SSA #2
> LVL1 LVL2
> DISK01 DISK02
> FILE01 FILE02
>
> TAPE01 TAPE02
>
> The 2 DISK01/02 pools are DEVTYPE=DISK (they are for files <5 MB).
> The FILE01/02 pools are DEVTYPE=FILE (they are for files >5 MB).
>
> This was originally set up with 2 objectives:
>
> 1. If an SSA adapter was lost, maintain access to 1/2 disks. We have
>
> since
> found out that all the disks are cabled through both adapters and
>
> if we lose
> 1 adapter, all our disk is still available. Therefore,
> 'splitting'
> our pools down
> the middle for availability purposes is not an issue.
>
> 2. The file pools are supposed to be better performing for large
> files
> (simulates
> streaming, i.e. writing to a tape drive). However, since we have
>
> only 2
> drives, our DISK01/DISK02 pools migrate to the FILE01/FILE02
> pools
> when
> they reach a threshold (FILE01/FILE02) migrate to TAPE01/TAPE02.
> Therefore it seems like we are potentially moving files a lot
> (first to write
> the small ones into the DISK pools, a second time to move these
> small
> files to the FILE pools, and finally a third time to tape when
> the
> FILE
> pools reach threshold).
>
> Also, we've experienced problems where a node points to a disk pool
> (such as
> disk02 pool) for backup and runs out of space so the backup fails, yet
>
> there is plenty of space on the other pools (i.e. disk01). It's also
> a
> manual balancing act for us to figure out when we add a new node which
>
> 'side' to put it on.
>
> So, I've convinced myself we want to switch to one pool. But, I'm
> curious on others out there.. Does anyone else run 'split' pools like
>
> we do, or file pools? And if so, what has been your experience? Has
> anyone ever attempted to combine a split environment into a single
> storage pool, like we are going to?
>
> Many thanks.
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