Messages in this thread | | | Date | Tue, 11 Oct 2011 22:59:18 -0400 | From | Wakko Warner <> | Subject | Re: Slow write performance with mpt2sas |
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Wakko Warner wrote: > I've noticed that my SAS9212-4i4e is having write issues. I have a raid5 of > 4 2tb seagate green drives and a raid5 of 3 300gb seagate 15k sas drives. > Write performance on the green drives is fairly poor. The riad4 of 4 disks > has a write performance of about 6-10mb/sec. My onboard sas controller > (1068e chip IT mode) does not have this issue (I'm using raid6 on 8 of the > same model green drives). > > Write performance on the 15k drives in raid 5 was 140mb/sec (4gb volume).
Sorry, this appears to be a KVM issue. I had forgotten that I was using this under KVM. Adding cache=writeback fixed my problems (Also note, my load before this went to >35 when writing, now it's no higher than about 9)
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