Customer benchmarked an X4600 using UFS on top of VxVM a while back
and got consistent performance under heavy load. Now they have put the
system into system test, but in the process moved from UFS/VxVM to
ZFS. This is 6/06
The are running at approximately 40% idle most of the time, with 10+%
system time, and 40+% user time. However, every 4 minutes or so, the
system time goes up to 60%, leaving no idle time. This is under steady
load, and the customer is concerned that it will not be able to ride
out peaks higher than this.
Is there any known processing that would be done every 4 minutes last
10 to 15 seconds that might be introduced by ZFS?
I don't have sufficient data yet to verify that the I/O is going to
ZFS volumes, but I do see a pair of disk with
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
sd21 0.1 129.3 8.5 9396.0 0.0 0.9 6.7 0 7
sd22 0.1 138.7 8.5 9872.0 0.0 0.9 6.7 0 7
going to:
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
sd21 0.0 59.0 0.0 1383.4 0.0 0.0 0.8 0 1
sd22 0.0 61.5 0.0 1455.2 0.0 0.1 0.9 0 1
or to:
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
sd21 0.0 180.2 2.1 16513.5 0.0 2.5 14.0 0 11
sd22 0.0 195.2 2.1 17485.1 0.0 3.0 15.5 0 11
Don't know yet which is 'normal' and which is not.
Thanks for any insights!
Steffen
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