If I was restoring just a single server from a small disaster onsite I'd
definatly restore individual base directories in the volume to get more
drives working on the problem.
I'll try benchmarking with some knownlarge files and see what I get
streaming those off as well.
The main problem with the DR restores is tape contention on the offsite
pool, the business needs 7 of the netware servers up and fully restored in
5days and with the throughput from offsite I'm getting of 4-7gb (and that
was with just 3 servers restore at the same time) I don't think I have a
hope in hell of doing it.
I'm about to upgrade to 7 LTO drives and fibre (so will have the same at the
dr site) but from what I can see what I'll gain with the faster drives I'll
lose from increased tape contention with the higher capacity tapes (35-70 >
100-200).
Collocating the offsite isn't an option as it would mean sending offsite
12ish tapes a day and with a retention of 30 days plus some stragglers thats
a hell of a lot of tapes to call abck from DR.
.........Rikk
-----Original Message-----
From: Remco Post [mailto:r.post AT SARA DOT NL]
Sent: 22 August 2002 18:00
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Restore Performance.
Hi,
you could try to manually do the restores per filespace. This would mean
al lot more work from you, but you get at least the performance of 8
tapedrives (maybe build a script to do so?) Alternatively, just start te
restore of all 7 servers at the same time, this will use only 7 of the 8
drives, allow for some overlap in mounting/unmounting actions.
10 GB/h is about 2.8 MB/s, meaning you probably have a lot of
reclaimable space on your tapes, or the tapedrives are not streaming
because of some botteneck. DLT7000 has a native transferrate of 5 MB/s,
meaning that with compression you should be able to get maybe 8 or
better....
On donderdag, augustus 22, 2002, at 04:22 , Cahill, Ricky wrote:
> I'm trying to find some figures to get an idea if the performance I'm
> getting on restores is correct or I have a problem.
>
> Config is:-
> Storagetek L180 Library with 8xDLT7000 drives
> Connected to the TSM server by cable to 3xAdaptec2940UWD controllers
>
> Doing restores from the collocated primay pools I'm getting 10gb an
> hour.
>
>> From a non collocated pool (offsite) I'm getting about 5-7gb an hour.
>
> Has anyone got any figures on restores using DLT7000's as we're going
> through the process of doing DR and having to
> restore 7 Netware servers with 1.4tb at the above speeds is going to be
> painful.
>
> PS...ANy hints and tips on doing large restores and how to speed them up
> greatly apreciated as well ;)
>
> Thanks in advance.
>
> ..........Rikk
>
>
>> iTNET
>> Rikk Cahill
>> 3rd Line Server Support
>> ricky.cahill AT itnet DOT com
>> Equitas London 0207-342-2358
>>
>>
>
>
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---
Met vriendelijke groeten,
Remco Post
SARA - Stichting Academisch Rekencentrum Amsterdam http://www.sara.nl
High Performance Computing Tel. +31 20 592 8008 Fax. +31 20 668 3167
"I really didn't foresee the Internet. But then, neither did the computer
industry. Not that that tells us very much of course - the computer
industry
didn't even foresee that the century was going to end." -- Douglas Adams
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please notify postmaster AT equitas.co DOT uk and delete the message and any
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