HI there, Stephan this is Stephen from Australia,
Thanks for such as great newsgroup
I'm a relative "Newbie" to this so please be patient, We haven't got a system
admin or an ADSM guru in house. Just tend to leave ADSM to run by itself. When
it needs upgrading then we call IBM. Most of the time we figure things out
oursleves .... ususally into the weee small hours of the mornigs over here. We
are geographically isolated from the Eastern States of Australia.
Anyway, we had a very similar problem recently regarding slow restore times.
Our system is no where near the sizes what some of you guys have I'm sure.
Briefly, it now consists of the following:-
1 x ADSM Server - 1Tb of SSA with +200Gb for ADSM Disk storage pools
1 x 3494 ATL
8 x 3590 drives
This is becoming a bit of a sore point in our organisation fast backup vs a
slow restore. If that is what you are speaking of....
The conclusion I reached at the time was that it always a questions of
resources and time, and making the most from whatever resource you have.
Internally we only a have a few clients of various types NT - Solaris - SGI -
and AIX. It's the big Servers that are the big head aches. Especially over a
100BT Ethernet. (Think that is bad it was until recently 10BT).
We took the decision early not to collocate data to improve backup times (there
are other activities we do in our ATL). As we thought quite rightly, at that
time it would make better use of resources. Small restores of say 10 to 20Gb
were just fine. We estimated the chances of a 300 Gb restore on one server that
was fully RAID'ed and mirrored as being (1 zillion to one).. Guess what I won
the lottery !!! It crashed RAID, mirrors, the lot ......... So we were forced
at gun point to improve this.
36 hours later it was restored .... but with so many tape mounts I lost count
on fingers and toes and started counting the hairs being pulled out of my head.
Our internal client was unhappy with the time it took to restore. They had been
doing this manually onto a single 3590 drive ..... (Of course they had not
considered the labour overheads and waste of resources doing a conventional
Weekly then daily incremental backup)
So we went for collocation of filesystems, added four more 3590's, added more
(bigger disk pools).... and are now begging for a real network that offers
Quality of Service.
Cut a long story short .... We now also use filespace collocation now and use
lots of disk storage pools prior to migrating to tape
This is done for this cleint onto 2 Disk Pools of roughly 50 Gb a piece then
flush to 3590 either after 90% or one week which ever comes first. We still
have all the little pools for other stuff and assigned to other nodes. But if
I'm not mistaken it's really is the big nodes that will cause you grief. If you
don't sit down and educate the client and don't raise their expections to high
then your asking for trouble. This was one of the mistakes we made. Showed our
internal clients (management) just how fast we could "blow away" a filesystem
of say 2 - 3 Gb and magically make it reappear !!! .
Many seem to think that a full restore on any system is just a cut a paste
matter; And done as quickly as dropping something onto you Win95 desktop.....
We have a couple more (internal) cleints coming across to us soon with more
than 2Tb filesystems attached. With the delta (change), daily, being about
half of that... It will make intersting reading some of our experiences when we
implement these suckers.
It would be great to hear of anyone else's experiences in ADSM especially those
of you who have to back up 1-3 Tb every night.
Thanks for some really interesting and helpful reading thus far since our
joining.
IBM had been keeping us in the dark for so long ....... Sorry Charlotte !!
hehehe
Stephen
Stephen R Pole
Operations Manager
Petroleum Geo-Services Data Management Australia
Level 4, IBM Centre
1060 Hay Street
West Perth WA 6005
Australia
Phone +61 8 9320 9080
Direct +61 8 9320 9081
Fax +61 8 9320 9090
Mobile +61 41 239 4435 (041 239 4435)
e-mail stephenp AT prth.geobank.pgs DOT com
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