Re: HSM & storage pool limits.

Arshad,

The obvious thing to do in your case is to turn Caching ON on the
Diskpool.  This will then keep as much data as possible in the
diskpool, but have the added protection of having it on tape as well.
You could then do a daily migration to tape for added protection, and
you would then only be relying on the HIMIG threshold to start
migration if there was an enormous amount of data going to the diskpool
each day.

The policies for migration are not optimal for pools that contain data
from one file system as you point out.

Cheers,
Simon
----------
| From: ADSM-L AT VM.MARIST DOT EDU; arshadmunir AT HOTMAIL DOT COM
| From: ADSM-L AT VM.MARIST DOT EDU; arshadmunir AT HOTMAIL DOT COM
| To: ADSM-L AT VM.MARIST DOT EDU
| Subject: HSM & storage pool limits.
| Date: Wednesday, 27 January, 1999 4:50PM
|
| Hello ADSMers,
|
|   I had a wonderful experience once again I know it is suppose
| to work like this but my question is, is there a work around?
| or to ADSM developers that why it like this. Now this is what
| happend:
|
| I have a AIX filesystem of 70Gig which is HSM filesystem
| I have a storage pool (Space Management storage pool) of 600Gig
| which are disks then I have a Second level storage pool which
| is robot. The first storage pool has %High of 90% & %low of
| 70%. This weekend first time we crossed this 90% mark & the
| data started migrating to Robot BUT it moved all the 600Gig to
| robot i.e. not stopping at 70%. which is true because in this
| case we have only one filespace (filesystem) & all should be
| migrated at one time but now are disks are empty & we are accessing
| the data from robot which is ..... lets says not very amazing.
|
| My Questions are:
|
| 1) Is there a work around?
| 2) Why all the data on a single filespace has to migrate together
|   technically speaking?
| 3) Is there are a way to get some data back to disk pool. I do not
| want to recall the files to disks & then migrate again?
|
| To split the filesystem to small onces will be the last thing
| I want to do & practically impossible which so much data.
|
| Any suggestions.
|
| Thanks in advance
|
| Arshad Munir
|
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