Eliza:

At the Disk only Backups Technical Exchange, IBM recommended 2-4 GB volume
size. (This was stated by the presenter, it was not written on the PDF
presentation.)  We started with 25 GB volumes and have now switched to 4 GB
volumes.

Using smaller volume sizes allows a better utilization of space and
increases restore performance with multi-session restore. (Also helps
eliminate contention if multiple clients are restoring from the same volume)


Tim Rushforth
City of Winnipeg

-----Original Message-----
From: Eliza Lau [mailto:lau AT VTCAT.CC.VT DOT EDU]
Sent: Tuesday, September 21, 2004 11:20 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: D2D on AIX

Eric,

What is the recommended volume size.  I have seen someone mentioned 5G, but
then
the number of volumes will explode from about 800 (current # of 3590 primary
tapes) to thousands.

How about keeping the staging space so clients backup to staging then
migrate
to FILE volumes.  Then every volume will be filled up.

Eliza

>
> Hi Eliza!
> You do want several smaller files, rather than a few very large files
> because each client session will allocate a volume. File volumes cannot be
> used concurrently by more than one session.
> Kindest regards,
> Eric van Loon
> KLM Royal Dutch Airlines
>
>
> -----Original Message-----
> From: Eliza Lau [mailto:lau AT VTCAT.CC.VT DOT EDU]
> Sent: Monday, September 20, 2004 19:11
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: D2D on AIX
>
>
> Our 3494 with 3590K tapes in 3 frames is getting full.  Instead of adding
> another frame or upgrading to 3590H or 3592 tapes we are looking into
> setting
> up a bunch of cheap ATA disks as primary storage.
>
> The FILE devclass defines a directory as its destination and JFS2
> has a max file system size of 1TB.  Does it mean the largest stgpool
> I can define is 1TB?
>
> My Exchange stgpool alone has 8TB of data.  Do I have to split it up
> into 8 pieces?
>
> server: TSM 5.2.2.5 on AIX 5.2
> database 90GB at 70%
> Total backup data - 22TB
>
> Eliza Lau
> Virginia Tech Computing Center
> lau AT vt DOT edu
>
>
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