We have several new DELL R900 servers which have 5 internal disks (PERC 6/i with 450GB SAS disks). we configured it as 0,1 mirror and 2,3 mirror and 4 single disk.
When we doing performance test and found "dump" very slow. The O.S. servers using are Centos 5.3 or 5.4.
1. we did setup "blockdev":
# blockdev --getra /dev/sdc3
4096
2. when we using dump for 16GB data (first logical volume to third logical volume) and it take 26 min to finish (10MB/sec).
#dump -0uf /u3/BKOS/root.dmp -B 40000000 /
DUMP: Date of this level 0 dump: Fri Dec 4 09:03:57 2009
DUMP: Dumping /dev/sdc2 (/) to /u3/BKOS/root.dmp
DUMP: Label: /
DUMP: Writing 10 Kilobyte records
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 15803002 blocks on 0.40 tape(s).
DUMP: Volume 1 started with block 1 at: Fri Dec 4 09:04:24 2009
DUMP: dumping (Pass III) [directories]
DUMP: dumping (Pass IV) [regular files]
DUMP: 16.69% done at 8453 kB/s, finished in 0:24
DUMP: 36.04% done at 9305 kB/s, finished in 0:17
DUMP: 57.06% done at 9887 kB/s, finished in 0:11
DUMP: 76.35% done at 9955 kB/s, finished in 0:06
DUMP: 99.68% done at 10418 kB/s, finished in 0:00
DUMP: Closing /u3/BKOS/root.dmp
DUMP: Volume 1 completed at: Fri Dec 4 09:31:23 2009
DUMP: Volume 1 16771020 blocks (16377.95MB)
DUMP: Volume 1 took 0:26:59
DUMP: Volume 1 transfer rate: 10358 kB/s
DUMP: 16771020 blocks (16377.95MB) on 1 volume(s)
DUMP: finished in 1607 seconds, throughput 10436 kBytes/sec
DUMP: Date of this level 0 dump: Fri Dec 4 09:03:57 2009
DUMP: Date this dump completed: Fri Dec 4 09:31:23 2009
DUMP: Average transfer rate: 10358 kB/s
DUMP: DUMP IS DONE
anyone have ideal?
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