Well, I have a 35 gbTSM database on Mod 9s, two volumes per physical device
and I have not noticed any worse performance since moving from mod 3s.
I would have preferred to have one logical volume per physical device but
TSM does not currently support extended vsam (over 4gb)
If/when TSM does support extended vsam then mod 27s will be quite feasible
for larger databases,
I do not agree with Christo's premise that TSM mainframe performance is
crap.
You are not comparing like with like.
What you see are dedicated unix or windows TSM servers, while the TSM
mainframe server is normally sharing
resources with many other applications.
Certainly in my experience poor TSM mainframe performance is down to
insufficient resources for the overall workload rather than anything
inherent in TSM.
thanks,
John
Christo Heuer
<christoh AT absa DOT co
.za> To
Sent by: "ADSM: ADSM-L AT vm.marist DOT edu
Dist Stor cc
Manager"
<[email protected] Subject
.edu> Re: Maximum database volumes?
08/07/2004 07:19
Please respond to
"ADSM: Dist Stor
Manager"
<[email protected]
.edu>
Performance and Tuning documentation states it should not be more than 13
Volumes - not
too sure how you achieve that in the mainframe world where you have 2.835
Gig
disks - (Mod3's).
Most shops don't really have access to mod9's, so then from a performance
guide point of view
you can not really go over 36.8 Gig database size - but on the mainframe
TSM
starts performing
crap before you even reach that size in anycase.
Anyhow - 13 is the recommended number of DB vols.
Cheers
Christo
> Before I upgrade our TSM server to v5.2 (seems to be taking forever to do
due to small outage windows) I want to reorganise our database volumes so
they are a little more efficient. Is there any recommended maximum number
of
database volumes a TSM database should have? Ours is spread across about 20
different volumes of varying sizes, not the best makeup I am sure, hence
why
I want to re-arrange it before hand.
>
> I've looked in the TSM Admin guide and searched IBM support, as well as
this list, but haven't really found anything of help.
>
> Thanks in advance,
>
> Gordon
>
>
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