On Thu, 27 Mar 2008, Neelakanth Nadgir wrote:
> This causes the sync to happen much faster, but as you say, suboptimal.
> Haven't had the time to go through the bug report, but probably
> CR 6429205 each zpool needs to monitor its throughput
> and throttle heavy writers
> will help.
I hope that this feature is implemented soon, and works well. :-)
I tested with my application outputting to a UFS filesystem on a
single 15K RPM SAS disk and saw that it writes about 50MB/second and
without the bursty behavior of ZFS. When writing to ZFS filesystem on
a RAID array, zpool I/O stat reports an average (over 10 seconds)
write rate of 54MB/second. Given that the throughput is not much
higher on the RAID array, I assume that the bottleneck is in my
>> Are the 'zpool iostat' statistics accurate?
> Yes. You could also look at regular iostat
> and correlate it.
Iostat shows that my RAID array disks are loafing with only 9MB/second
writes to each but with 82 writes/second.
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