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тАО02-03-2005 05:05 AM
тАО02-03-2005 05:05 AM
Problems with restore throughput
1x EVA 3000
1x MSL6030 with 2x LTO Ultrium drives and NSR
2x RP4440s
When we backup an area, it does so quite quickly but the problems start when restoring the data.
We started restoring a backup this morning at about 9am from the MLS to a directory on the EVA and so far it has restored about 12% of a 70gig backup. Thats 12% in around 9 hours.
Does anyone have any idea why its taking so long for the restore? (The data that is being restored is an Oracle environment and is crucial that it be back up and running as soon as possible)
Cheers
Dave
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тАО02-03-2005 05:17 AM
тАО02-03-2005 05:17 AM
Re: Problems with restore throughput
Note that if it takes an hour to create the backup, it will take longer to restore. This is because the backup is a read on disk, write to tape and the restore is a read on tape(slower) and write to disk(which can be interfered with by system activity, especially in a raid 5 environment).
Are you getting any progress at all?
Can you restore to an idle or raid 1 filesystem?
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
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тАО02-03-2005 07:26 AM
тАО02-03-2005 07:26 AM
Re: Problems with restore throughput
At present its done 14% in a 12 hour period.
Should the block size on the logical volme be the same on the tape or does that not matter?
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тАО02-03-2005 07:43 AM
тАО02-03-2005 07:43 AM
Re: Problems with restore throughput
You tell that "it is an Oracle enviroment". Dors it mean that it is a RMAN backup/restore. If so, it may be an RMAN problem.
If it is a filesystem backup/restore your backup performance (70GB/4h) seems slow to me, a rp4440/EVA/MSL6030 should perform better. Is there a very large number of small files ?
Which backup tool are you using, if Data Protector, you should not change any default settings (e.g. bloksize).
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тАО02-03-2005 07:53 AM
тАО02-03-2005 07:53 AM
Re: Problems with restore throughput
Sometimes there is a penalty for faster backups.
Are you using Legato? If so, there are two things to look at. One is the server parallelism (# of streams that can be processed by a client) and the other is the target sessions (# streams each tape drive can process).
If your client is backing up to multiple tapes, then you have to restore by multiple tapes as well. Also if you have it set so multiple clients are writing simultaneously to tape, then it takes longer for the system to browse for the files that are needed to restore because the tape is quite fragmented .
I hope that this helps some.
Andy
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тАО02-03-2005 12:09 PM
тАО02-03-2005 12:09 PM
Re: Problems with restore throughput
The oracle environment does contain lots of small files, but surely this still should have finished by now - 1am and still at work :( with 14% complete
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тАО08-15-2006 10:18 PM
тАО08-15-2006 10:18 PM
Re: Problems with restore throughput
It turned out to be a faulty Gbic on the fibre switch