10-19-04 10:45 PM
In article <c976cb73.0410190928.53bc2f3@posting.google.com>,
sl1433@hotmail.com (Beeblebrox) wrote:
> I'm using V480s with A1000s as storage using Veritas DB edition,
> solaris 8 running oracle.
>
> We're seeing poor IO performance and I'm having trouble pinpointing
> the problem. IO looks fine when it's mostly writes, but tanks the
> moment reads increase:
>
>
>
> Lookin' good:
>
> r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c2t5d0
> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c5t4d0
> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c0t0d0
> 5.1 124.5 52.0 1154.4 0.2 0.8 1.5 6.3 2 23 c2t5d1
> 5.7 120.7 54.3 1124.0 0.4 0.8 2.9 6.4 2 22 c2t5d2
> 5.0 131.9 51.2 1212.8 0.2 0.9 1.4 6.3 2 24 c2t5d3
> 5.1 128.8 52.0 1188.8 0.4 0.9 2.8 6.4 3 24 c2t5d4
> 6.2 127.4 65.6 1177.6 0.5 1.0 3.6 7.7 3 27 c5t4d1
> 4.9 128.0 44.9 1180.2 0.2 1.0 1.4 7.5 2 26 c5t4d2
> 5.9 122.8 52.8 1139.2 0.3 0.9 2.4 7.1 3 26 c5t4d3
> 4.9 124.1 44.8 1151.2 0.2 0.8 1.6 6.5 2 24 c5t4d4
>
>
> Crap-o-rific:
>
> r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
> 0.4 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0 0 c2t5d0
> 0.4 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0 0 c5t4d0
> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c0t0d0
> 47.8 5.4 531.3 172.8 0.9 4.9 17.6 92.5 16 51 c2t5d1
> 51.8 5.4 559.3 172.8 1.4 5.3 24.1 93.3 17 54 c2t5d2
> 48.1 5.8 532.9 176.0 0.9 4.7 16.1 87.0 16 52 c2t5d3
> 46.6 5.4 515.9 172.8 0.5 4.4 9.7 84.4 10 50 c2t5d4
> 51.3 6.0 545.7 182.4 2.5 8.3 43.2 144.8 32 84 c5t4d1
> 49.6 5.7 535.3 179.3 1.8 7.9 32.2 142.0 30 79 c5t4d2
> 52.5 6.2 560.9 183.2 1.9 6.9 32.2 117.1 26 74 c5t4d3
> 50.0 5.6 552.1 179.2 2.5 7.3 44.3 131.8 27 78 c5t4d4
>
>
> The examples above are from the standby, and we see the same IO
> profile on the primary.
>
> I've checked write-cache, prefetch, read-ahead. I've looked for HW
> problems, too.
>
> Neither of these hosts have been touched for months -- I'm very
> certain of that.
>
>
> Thoughts appreciated.
What are the volumes in Veritas? You've probably been told that RAID5
is a Bad Idea(tm) for write-heavy applications.
--
DeeDee, don't press that button! DeeDee! NO! Dee...
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