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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