True, assuming you have collocated your data by file space. If you
haven't, (perhaps it is collocated by server, or not at all) it is possible
to run into a situation where each instance of those DSM windows is
attempting to access files which exist on the same tape.
I did this once, and found the same tape moving back and forth between two
tape drives. I've since corrected my ways :)
Wilson Northrup
-----Original Message-----
From: Prather, Wanda [mailto:Wanda.Prather AT JHUAPL DOT EDU]
Sent: Wednesday, April 02, 2003 8:58 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: NEED HELP - Restore performance
Regardless of the client level, you can open as many dsm windows and start
as many restores at once as you want.
That's the best way to go if you have multiple filesystems to restore, up
until you bottleneck your networks.
-----Original Message-----
From: Zoltan Forray/AC/VCU [mailto:zforray AT VCU DOT EDU]
Sent: Tuesday, April 01, 2003 10:10 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: NEED HELP - Restore performance
FYI, FWIW, the option of multiple-restore streams was introduced with the
5.x client. While this machine is still using 4.2.3.0, we are going to
investigate upgrading to 5.1.5.x Not sure why this client wasn't
upgraded.
Any specifics on how to do the "no query" restore ? We checked the book
and from what it says, we are doing this (using wild-card/*, no -inact,
etc). Are we missing something or is this one of those features that
didn't really make it until the V5 client. Examples would be extremely
helpful !
Lloyd Dieter <dieter AT SNRGY DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
04/01/2003 06:11 PM
Please respond to "ADSM: Dist Stor Manager"
To: ADSM-L AT VM.MARIST DOT EDU
cc:
Subject: Re: NEED HELP - Restore performance
Zoltan,
You've probably tried this already, but just in case...have you cranked up
resourceutilization and maxnummp?
Maybe no-query restores?
Just a thought...
-Lloyd
On Tue, 1 Apr 2003 17:45:46 -0500
Zoltan Forray/AC/VCU <zforray AT VCU DOT EDU> wrote:
> This is a zOS TSM 4.2.3.2 server. The client server is AIX 4.3 with
> TSM client 4.2.3.0
>
> We had a recent hardware failure/disaster which resulted in a complete
> wipe of 250GB+ of storage on an AIX 4.3 system. To complicate matters,
> this is one of our email system, with 22-MILLION files comprising the
> 250GB.
>
> So, we start the *BIG* restore. To put it quaintly, restore performance
> sucks. We are averaging .5GB per hour. At this rate, it will take
> 15-20 DAYS !
>
> I have gone through the "TSM Performance Tuning" guide, to no avail. I
> had pretty much done everything the book suggests, long ago, with the
> exception of pagefixing storage for the VSAM/BSAM reads.
>
> Even checked its recommendations for the AIX system for things like
> TCPIP settings, etc.
>
> The AIX system is hardly breathing hard, when it comes to CPU
> utilization.
>
> What can I look at to do anything I can to speed things up ?
>
> Can I run multiple restores of different filesystems ?
>
--
-----------------------------------------------------------------
Lloyd Dieter - Senior Technology Consultant
Registered Linux User 285528
Synergy, Inc. http://www.synergyinc.cc ldieter AT snrgy DOT com
Main:585-389-1260 fax:585-389-1267
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