Date: Fri, 29 Nov 2013 02:00:31 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: freebsd-fs@freebsd.org Subject: zfs unneceary massive IO writing Message-ID: <20131128220031.GA77254@zxy.spb.ru>
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I have host with 8-STABLE and ZFS. ZFS setup is very simple: zfs_www 880G 665G 215G 75% 1.00x ONLINE - aacd0s3 880G 665G 215G - No L2ARC, no ZIL, copies=1 After creating small file (or append some bytes to file) I see very large write to disk (400 write ops, total up to 1MB). How I can discover this problem? dtrace on zio_create? How I can diagnose source of IO operation?
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