On Thu, 25 Feb 2010, Shane Cox wrote:
I'm new to ZFS and looking for some assistance with a performance problem:At the interval of zfs_txg_timeout (I'm using the default of 30), I observe 100-200ms pauses in my application. Based on my application log files, it appears that the write() system call is blocked. Digging deeper into the problem with DTrace, I
If you check the forum archives you will find quite a few long discussion threads about this issue. I initiated at least one of them.
When zfs writes a transaction group there will be a stall in an application which writes continuously. The main thing you can do is to adjust zfs tunables to limit the size of a transaction group, or to increase the frequency of transaction group commits. One such tunable is
zfs:zfs_write_limit_override set in /etc/system. Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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