Just to share some information...
Here is a "bonnie -s 1024" on a P4 2.4 with 512MB RAM. The RAID5 is my weirdo way of doing multiple RAID5 devices so that I can move things around. All 4 RAID5 meta devices are on the same 5 disks... 300GB SATA and (4) 200GB PATA drives.
LVM2 over RAID5
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1024 16987 69.9 34777 7.4 16659 4.1 21532 86.4 49760 9.2 470.7 1.7
"Hot" SATA 300GB (Maxtor)
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1024 23553 96.2 62613 14.0 26123 5.1 22094 87.5 57233 6.9 200.9 0.4
Forgot to mention that the RAID5 devices are 1024k "chunk-size". Filesystem is reiserfs.
-Scott
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