On 06/08/2011 04:05 PM, Tomas Ögren wrote:
On 08 June, 2011 - Donald Stahl sent me these 0,6K bytes:
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.
And if pool usage is>90%, then there's another problem (change of
finding free space algorithm).
/Tomas
Tomas,
Thanks for your suggestion.
You are right.
I have tune parameter metaslab_df_free_pct from 35 to 4 to reduce this
problem some days ago.
The performance keep good for about 1 week and performance degrade again.
And I still not sure how many operation run into best fit block allocate
policy
and how many run into fist fit block allocate policy in current situation.
It's very appreciate if you can help.
Regards,
Ding
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