ADSM-L

Re: [ADSM-L] Sizing virtual tapes

2007-12-04 22:19:55
Subject: Re: [ADSM-L] Sizing virtual tapes
From: "Loon, E.J. van - SPLXM" <Eric-van.Loon AT KLM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 29 Nov 2007 17:06:15 +0100
I agree with John. We are currently using 100Gb. volumes in out DL700,
but I'm frequently called by user who's restore seems to hang.
In most cases the tape is in use by another restore or in use by a
backup storagepool/reclamation which first has to finish the file it's
backing up or reclaiming.
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Schneider, John
Sent: donderdag 29 november 2007 15:55
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Sizing virtual tapes

David,
        Your question is a good one.  On our EMC Disk Libraries we
emulate LTO1 tape drives, with 50GB maximum tapes.  I believe this
improves overall disk utilization for just the reason you mention.  You
can reclaim the smaller tapes sooner.  TSM won't have to wait until
~250GB of data, which may have been written over a period of weeks,
expires before the virtual tape is ready to reclaim.

Best Regards,

John D. Schneider
Lead Systems Administrator - Storage
Sisters of Mercy Health Systems
Email:  John.Schneider AT Mercy DOT net


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
David E Ehresman
Sent: Thursday, November 29, 2007 8:01 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Sizing virtual tapes


How large are you making the max size of your virtual tapes?  Why?

I let my TS7520 emulating 3592E tapes default to a max size of 460GB but
I'm starting to think a smaller size would make more sense.  The median
size of occupancy for my nodes is around 40GB so I'm thinking that might
be a better max size to facilicate reclamination.

David
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