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alih0000

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19 years ago

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alih0000

14 Posts

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574

August 2nd, 2007 05:00

Celerra NDMP backup performance

Hello

I have recently enabled ndmp to backup a Celerra ns20 through Legato networker 7.3 and really concerned with the throughput i am getting we are backing to two
LTO2 drives in parallel and recieving around 20-25m MB/S.
The drives are connected to the celerra through the san

Can anyone advise how to improve the throughput

---- NASW STATS ----
nasw00 BACKUP (in progress)
Session Total Time: 00:24:45 (h:min:sec)
Session Idle Time: 00:06:15 (h:min:sec)
KB Tranferred: 28747920 Block Size: 61440 (60 KB)
Average Transfer Rate: 18 MB/Sec 66 GB/Hour
Average Burst Transfer: 25 MB/Sec 88 GB/Hour
__Point-in-Time__ (over the last 10 seconds):
Rate=16 MB/Sec Burst=16 MB/Sec Idle=0 msec/sec
Get Pool: 63 buffers Put Pool: 0 buffers

nasw01 BACKUP (in progress)
Session Total Time: 00:23:46 (h:min:sec)
Session Idle Time: 00:07:56 (h:min:sec)
KB Tranferred: 26110680 Block Size: 61440 (60 KB)
Average Transfer Rate: 17 MB/Sec 62 GB/Hour
Average Burst Transfer: 26 MB/Sec 94 GB/Hour
__Point-in-Time__ (over the last 10 seconds):
Rate=0 MB/Sec Burst=0 MB/Sec Idle=0 msec/sec
Get Pool: 63 buffers Put Pool: 0 buffers
  • dynamox

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    Posted August 2nd, 2007 05:00

    I have seen a very significant improvement in my backup once i enable this feature:

    https://forums.emc.com/forums/thread.jspa?threadID=56805&tstart=0
  • alih0000

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    Posted August 2nd, 2007 06:00

    yes but isnt this a snapshot backup what about if you had file system corruption and needed to restore the whole file system these backups would be no good.
  • dynamox

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    Posted August 2nd, 2007 06:00

    it's a snapshot, which is basically a point in time copy of your file system. Snapshot is a bunch of pointers to your file system. It will be a consistent backup with no open files.