atom feed2 messages in org.freebsd.freebsd-fszfs on 4k sector disks
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S MJul 12, 2010 5:24 am 
Jeremy ChadwickJul 12, 2010 5:47 am 
Subject:zfs on 4k sector disks
From:S M (zw_@hotmail.com)
Date:Jul 12, 2010 5:24:39 am
List:org.freebsd.freebsd-fs

I found that playing with either:

(sysctl) vfs.zfs.txg.write_limit_override

or

(boot/loader.conf) vfs.zfs.txg.timeout=5 (boot/loader.conf) vfs.zfs.txg.synctime=5

Helped with the write problem. What seems to happen is that zfs' calculations go
slightly wrong if you have a lot of RAM and therefore zfs buffers too much,
forcing so many writes that you lose all read IO for a few seconds....

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