Adaptec 2010S raid5 low performance



Hi.

I've configured raid 5 ( 3 disks SCSI 10K 17GB ) on Adaptec 2010S.
Write performance is lower than single disk. When I restore DB2 backup,
tabelspace creation time on single disk is ~6min and on raid5 is ~16min.
Cache on this array is on. Why performance of this array is so poor ? Is it problem with this controller or this is some configuration problem ?
.



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