I am new to OSOL/ZFS but have just finished building my first system.
I detailed the system setup here:
http://opensolaris.org/jive/thread.jspa?threadID=128986&tstart=15
I ended up having to add an additional controller card as two ports on the
motherboard did not work as standard Sata port. Luckily I was able to salvage
an LSI SAS card from an old system.
Things seem to be working OK for the most part.. But I am trying to dig a bit
deeper into the performance. I have done some searching and it seems that the
iostat -x can help you better understand your performance.
I have 8 drives in the system. 2 are in a mirrored boot pool and the other 6
are in a single raidz2 pool. All 6 are the same. Samsung 1TB Spinpoints.
Here is what my output looks like from "iostat -x 30" during a scrub of the
raidz2 pool:
device r/s w/s kr/s kw/s wait actv svc_t %w %b
cmdk0 299.7 1.5 37080.9 1.6 7.7 2.0 32.3 98 99
cmdk1 300.2 1.3 37083.0 1.5 7.7 2.0 32.2 98 99
cmdk2 1018.6 1.6 37141.3 1.7 0.5 0.7 1.2 22 43
cmdk3 0.0 1.8 0.0 5.2 0.0 0.0 33.7 1 2
cmdk4 1045.6 2.1 37124.3 1.4 0.7 0.7 1.3 21 41
sd6 0.0 1.8 0.0 5.2 0.0 0.0 25.1 0 1
sd7 1033.4 2.5 37128.5 1.8 0.0 1.0 1.0 3 38
sd8 1044.5 2.5 37129.4 1.8 0.0 0.9 0.9 3 36
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
cmdk0 301.9 1.3 37339.0 1.7 7.8 2.0 32.1 99 99
cmdk1 302.1 1.4 37341.0 1.8 7.7 2.0 32.0 99 99
cmdk2 1048.1 1.5 37400.4 1.6 0.5 0.7 1.1 20 42
cmdk3 0.0 1.5 0.0 5.1 0.0 0.0 36.5 1 2
cmdk4 1054.4 1.6 37363.1 1.5 0.7 0.6 1.2 20 40
sd6 0.0 1.5 0.0 5.1 0.0 0.0 30.4 0 1
sd7 1044.4 2.1 37404.2 1.7 0.0 0.9 0.9 3 38
sd8 1050.5 2.1 37382.8 1.9 0.0 0.9 0.9 3 36
extended device statistics
device r/s w/s kr/s kw/s wait actv svc_t %w %b
cmdk0 296.3 1.5 36195.4 1.7 7.8 2.0 32.7 99 99
cmdk1 295.2 1.5 36230.1 1.8 7.7 2.0 32.5 98 98
cmdk2 987.5 2.0 36171.5 1.7 0.6 0.7 1.3 22 43
cmdk3 0.0 1.5 0.0 5.1 0.0 0.0 37.7 1 2
cmdk4 1018.3 2.0 36160.8 1.6 0.7 0.6 1.4 21 41
sd6 0.0 1.5 0.0 5.1 0.0 0.1 40.3 0 2
sd7 1005.3 2.6 36300.6 1.8 0.0 1.1 1.1 3 39
sd8 1016.0 2.5 36260.1 2.0 0.0 1.0 1.0 3 36
I think cmdk3 and sd6 are in my rpool. I tried to split the pools across the
controllers for better performance.
It seems to me that cmdk0 and cmdk1 are much slower than the others.. But I am
not sure why or what to check next... In fact I am not even sure how I can
trace back that device name to figure out which controller it is connected to.
Any ideas or next steps would be appreciated.
Thanks.
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