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[K12OSN] RAID5 so slow?



Hi!

I test 2 similar computers today. Almost similar except SCSI controllers and kernels.
I found RAID5 2x slower than disks separately in other computer. Is it normal or I have some misconfigutations in Intel controller or default FC3 kernel?


Computer 1- Intel HG2 MB, DualXeon 2,8GHz, Intel RAID U320 add-on controller with 3 disks RAID5 array.

array (sda) 3x73GB Atlas 10K3 Kernel 2.6.11-1.14_FC3smp #1 SMP

[root ts ~]# hdparm -t /dev/sda
/dev/sda: Timing buffered disk reads: 82 MB in 3.02 seconds = 27.18 MB/sec


Computer 2 - Intel VB2 DualXeon 2,4GHz, Adaptec U160.
Disk (sda) 36GB Atlas 10K4 Kernel 2.4.30-1.smp.dma #1 SMP (self compiled)

[root mail root]# hdparm -t /dev/sda
/dev/sda: Timing buffered disk reads: 64 MB in 0.95 seconds = 67.37 MB/sec
====
Why faster disk and controller give slower performance data with RAID?



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