On 23/02/2010 17:18, Richard Elling wrote:
On Feb 23, 2010, at 1:00 AM, v wrote:
Hi experts,
I am new to zfs and ask a question regarding zfs sequential peroformance: I read some
blogs saying that netapp's WAFL can suffer "sequential read after random
write(SRARW)" performance penalty, since zfs is also doing no update in place, can
zfs has such problem?
I know of only one study of this effect, by Allan Packer and Neel using MySQL.
http://www.youtube.com/watch?v=a31NhwzlAxs
slides at
http://blogs.sun.com/realneel/resource/MySQL_Conference_2009_ZFS_MySQL.pdf
from my own experience with mysql on top of zfs on solaris 10 - after a
fresh db restore backup times X amount of time. After couple of weeks of
the database in live the backup takes 2-3x the amount of X.
--
Robert Milkowski
http://milek.blogspot.com
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