I have a HP P2000 G3 array with two 10Gbit iSCSI controllers in it that presents storage to my virtualisation cluster. It is soon to be expanded with two D2700 shelves each loaded with 25 10k RPM 300GB 6G SAS disks for added performance.
Currently, the two vDisks I have on the first shelf are 'scrubbed' every day, probably more than once, I haven't checked... But either way, it seems like one of the vDisks is being scrubbed at any hour of the day.
How much does disk scrubbing effect array performance? I know that its a disk consistency check and therefore is important, but should I tune this down so they array does not scrub so aggressively?