Best mkfs.ext2 performance options on RAID5 in CentOS 4.2

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blockdev --setra 16384 /dev/sda

Sean Staats wrote:
> I can't seem to get the read and write performance better than
> approximately 40MB/s on an ext2 file system.  IMO, this is horrible
> performance for a 6-drive, hardware RAID 5 array.  Please have a look at
> what I'm doing and let me know if anybody has any suggestions on how to
> improve the performance...
> 
> System specs:
> -----------------
> 2 x 2.8GHz Xeons 
> 6GB RAM
> 1 3ware 9500S-12
> 2 x 6-drive, RAID 5 arrays with a stripe size of 256KB.  Each array is
> 2.3TB after formatting.
> ioscheduler set to use the deadline scheduler.
> 
> mkfs.ext2 options used:
> ------------------------
> mkfs.ext2 -b 4096 -L /d01 -m 1 -O sparse_super,dir_index -R stride=64 -T
> largefile /dev/sda1
> 
> I'm using a stride size of 64 since the ext2 block size is 4KB and the
> array stripe size is 256KB (256/4 = 64).
> 
> Output of using bonnie++:
> ---------------------------
> $ /usr/local/bonnie++/sbin/bonnie++ -d /d01/test -r 6144 -m
> anchor_ext2_4k_64s
> Version  1.03       ------Sequential Output------ --Sequential Input-
> --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
> --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP 
> /sec %CP
> anchor_ext2_4k_ 12G 41654  96 41937  11 30537   8 40676  88 233015  27
> 426.6   1
>                     ------Sequential Create------ --------Random
> Create--------
>                     -Create-- --Read--- -Delete-- -Create-- --Read---
> -Delete--
>               files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP 
> /sec %CP
>                  16  3369  83 +++++ +++ +++++ +++  4142 100 +++++ +++
> 11728 100
> 
> 
> Cheers!
> Sean
> 
> 
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-- 
Joseph Landman, Ph.D
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Scalable Informatics LLC,
email: landman@xxxxxxxxxxxxxxxxxxxxxxx
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