> The best place to start looking at disk-related
> performance problems
> is iostat.
> Slow disks will show high service times. There are
> many options, but I
> usually use something like:
> iostat -zxcnPT d 1
>
> Ignore the first line. Look at the service times.
> They should be
> elow 10ms
> for good performance.
Thanks for the reply!
It seems that c2t4d0s0 is the one making trouble, as I suspected. Here is a
sample line from the output while copying a file from the DATA-pool to /tmp/:
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
17.0 6.0 896.5 8.5 0.7 27.6 31.8 1201.5 73 100 c2t4d0s0
The asvc_t is insanely high, while the other disks are from 0 to max 80, but
mostly around 0.
What does this mean? Is the disk defective? Could I get it replaced by the
warranty? If I want to exchange it in the pool with the hot spare, how do I go
around doing that? I want to make sure that the whole pool doesn't collapse on
me if I take out this disk, and then the problems isn't really this disk but
some other, and the whole pool is gone...
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