Now we get into religion. IBM did offer a figure of ~5GB during the
webinar, but there are a lot of factors that would affect this such as:

REUSE DELAY: you want to be able to use those TSM DB backups

RECLAMATION THRESHOLD: A lower threshold should lead to more efficient
usage of volumes except that it causes more frequent tape reclamation
leading to more pending volumes causing wasted space.  Of course the
exact opposite is true regarding higher reclamation thresholds.  What
yin yang is right for you? Experiment and find out.

AVG SIZE OF STORED OBJECTS?

EXPIRATION RATE OF STORED OBJECTS?

I'm sure others will bring up other factors.  How many volumes are too
many?  If TSM is keeping track of the volumes and you are not handling
the physical volumes (i.e. loading/unloading tapes), is 4,000 too many?
If so, why?

H. Milton Johnson
 
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Eliza Lau
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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