On 06/20/09 11:14, tester wrote:
Hi,
Does anyone know the difference between zpool iostat and iostat?
dd if=/dev/zero of=/test/test1/trash count=1 bs=1024k;sync
pool only shows 236K IO and 13 write ops. whereas iostat shows a correctly meg
of activity.
The zfs numbers are per second as well. So 236K * 5 = 1180K
"zpool iostat -v test 1" would make this clearer.
The iostat output below also shows 237K (88+37+112) being written per second.
I'm not sure why any reads occurred though. When I did a quick
experiment there were no reads.
Enabling compression gives much better numbers when writing zeros!
Neil.
zpool iostat -v test 5
capacity operations bandwidth
pool used avail read write read write
-------------------------------------- ----- ----- ----- ----- ----- -----
test 1.14M 100G 0 13 0 236K
c8t60060E800475F500000075F500000525d0 182K 25.0G 0 4 0
36.8K
c8t60060E800475F500000075F500000526d0 428K 25.0G 0 4 0
87.7K
c8t60060E800475F500000075F500000540d0 558K 50.0G 0 4 0
111K
-------------------------------------- ----- ----- ----- ----- ----- -----
iostat -xnz [devices] 5
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
2.4 6.0 6.8 88.2 0.0 0.0 0.0 1.0 0 0
c8t60060E800475F500000075F500000540d0
2.4 5.4 6.8 37.0 0.0 0.0 0.0 0.9 0 0
c8t60060E800475F500000075F500000526d0
2.4 5.0 6.8 112.0 0.0 0.0 0.0 0.9 0 0
c8t60060E800475F500000075F500000525d0
dtrace also concurs with iostat
device bytes IOPS
====== ==== ====
/devices/scsi_vhci/s...@g60060e800475f500000075f500000525:a 224416
35
/devices/scsi_vhci/s...@g60060e800475f500000075f500000526:a 486560
37
/devices/scsi_vhci/s...@g60060e800475f500000075f500000540:a 608416
33
Thanks
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
