On Sat, 8 Aug 2009, Ed Spencer wrote:
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
11.9 43.0 528.9 1972.8 0.0 2.1 0.0 38.9 0 31
c4t60A98000433469764E4A2D456A644A74d0
17.0 19.6 496.9 1499.0 0.0 1.4 0.0 38.8 0 39
c4t60A98000433469764E4A2D456A696579d0
14.0 30.0 670.2 1971.3 0.0 1.7 0.0 38.0 0 34
c4t60A98000433469764E4A476D2F664E4Fd0
19.7 28.7 985.2 1647.6 0.0 1.6 0.0 32.5 0 37
c4t60A98000433469764E4A476D2F6B385Ad0
I have this in my /etc/system file:
* Set device I/O maximum concurrency
*
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Device_I.2FO_Queue_Size_.28I.2FO_Concurrency.29
set zfs:zfs_vdev_max_pending = 5
This parameter may be worthwhile to look at to reduce your asvc_t.
It seems that the default (35) is tuned for a true JBOD setup and not
a SAN-hosted LUN.
As I recall, you can use the kernel debugger to set it while the
system is running and immediately see differences in iostat output.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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