From: L (leed@CHELE.CAIS.NET)
Date: Mon Jul 22 2002 - 15:46:35 EDT
we have IBM P660 and AIX 4.3.3 O.S. on it. The P660 have 2498 Ultra SCSI3
RAID adapter card and connect seperate cables to 2104 disk array. We
configure 6 disks hardware RAID5 through "PDAM". while I load data from
LTO tape driver (high speed tape driver 15~30MB/sec) to this RAID5. the
performance is very very slow. Load 2Gb data toke 2hours to finish. I
use "topas" to check and found this RAID5 wrte speed is "550KByte/sec". I
called IBM support and support engineer told me nothing he can help.
Does anyone have expereince on it and can give me suggestion?
The configuration on 2498 RAID5 are:
6 disks raid 5
stripe size: 16K
command Queue Depth: 16
Thanks.
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