On 06/08/2011 12:12 PM, Donald Stahl wrote:
One day, the write performance of zfs degrade.
The write performance decrease from 60MB/s to about 6MB/s in sequence
write.
Command:
date;dd if=/dev/zero of=block bs=1024*128 count=10000;date
See this thread:
http://www.opensolaris.org/jive/thread.jspa?threadID=139317&tstart=45
And search in the page for:
"metaslab_min_alloc_size"
Try adjusting the metaslab size and see if it fixes your performance problem.
-Don
"metaslab_min_alloc_size" is not in use when block allocator isDynamic block
allocator[1].
So it is not tunable parameter in my case.
Thanks anyway.
[1]
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/fs/zfs/metaslab.c#496
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