|Subject:||Re: [zfs-discuss] ZFS Hard disk buffer at 100%|
|Date:||Fri, 7 May 2010 14:38:25 -0300|
On Fri, May 7, 2010 at 8:07 AM, Emily Grettel <emilygrettelisnow@xxxxxxxxxxx> wrote:
That's the percent of time the disk is busy (transactions in progress) - iostat(1M).
You might be maxing out your drives' I/O capacity. That could happen when ZFS is commting the transactions to disk every 30 seconds but if %b is constantly high you disks might not be keeping up with the performance requirements.
We've had some servers showing high asvc_t times but it turned out to be a firmware issue in the disk controller. It was very erratic (1-2 drives out of 24 would show that).
If you look in the archives, people have sent a few averaged I/O performance numbers that you could compare to your workload.
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