Re: [Networker] Large Volumes & Speed..
2004-04-01 08:32:30
Networker says my max parallelism on my server is 32, it won't allow
anything higher.
Another thought.. Quantum's website says the SDLT320 will write 16 mb/sec
uncompressed, thats about 1gb per minute roughly. That is almost 10 hours
to write 500gb of raw data, maybe my backups will just be that slow.. I
don't know the inner workings of Networker with compression and such though.
At 08:09 AM 4/1/2004, you wrote:
Client Parallelism is a hidden option in your client resource. So if you
want to use 3 devices parallel with that client, set it to a value of 12.
The other question is, can your server create enough IO to serve the
possible native writespeed of your DLTs.
Device parallelism is not a hard limit, it is just used for loadbalancing.
You should set your server parallelism general to a higher value. Better
set it to 256
regards
Klaus
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Von: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU] Im
Auftrag von Robert McCarthy
Gesendet: Donnerstag, 1. April 2004 14:53
An: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Betreff: Re: [Networker] AW: [Networker] Large Volumes & Speed..
Client Parallelism? Is there an option I don't see it in the client record.
Device parallelism is 4 per drive. (this was the default)
Server parallelism is 24 (I changed it by guessing 6 drives at 4 makes 24)
Thanks, Rob.
At 07:39 AM 4/1/2004, Grohal Klaus wrote:
>What's the value of your client parallelism, device parallelism and server
>parallelism?
>
>Regards
>Klaus
>
>-----Ursprüngliche Nachricht-----
>Von: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
Im
>Auftrag von Robert McCarthy
>Gesendet: Donnerstag, 1. April 2004 14:15
>An: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
>Betreff: [Networker] Large Volumes & Speed..
>
>
>I have some really large volumes that I need backed up on a regular basis,
>there are 6 volumes around 600Gb each. I added them to my normal cycle but
>when it hits a full volumes it takes days to backup. I currently run a
>Windows 2000 server with two Dell PV-136T (Dell branded Adic Scalar 100)
>with 3 SDLT320 drives per box. It seems Legato only writes to one tape at
>a time per volume, is this by design? It has six drives available to use,
>but only seems to write different clients to the six drives in
>parrallel. Any suggestions on speeding up large volume backups? I run
>Gigabit copper to my backup server, I feel the bottleneck is with Legato
>and possibly the SDLT drive write speed may be a factor. Any thoughts will
>be appriciated.
>
>-Rob.
>
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\ / /__________ /
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| | : .. .. : | | System Administrator
| | . ... . | | Group 34 - Intelligence, Test, and Evaluation
| | : .. .. : | | Lockheed Martin Systems Management
| | .. . .. | | MIT Lincoln Laboratory - Building S
| | . .. .. . | | 244 Wood Street
| | :. ... .: | | Lexington, MA. 02420-9185
| | . .. .. . | | Phone: (781) 981-3130
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