Hello Robert,
Monday, April 23, 2007, 1:20:28 AM, you wrote:
RM> Hello zfs-discuss,
RM> bash-3.00# uname -a
RM> SunOS nfs-10-1.srv 5.10 Generic_125100-04 sun4u sparc SUNW,Sun-Fire-V440
RM> zil_disable set to 1
RM> Disks are over FCAL from 3510.
RM> bash-3.00# dtrace -n
RM> fbt::*SYNCHRONIZE*:entry'{printf("%Y",walltimestamp);}'
RM> dtrace: description 'fbt::*SYNCHRONIZE*:entry' matched 4 probes
RM> [no output]
RM> Why?
RM> ps. of course there're writes to the pool
Thanks to Roch for suggesting uscsi_strategy.
bash-3.00# dtrace -n
fbt::*sd_uscsi_strategy:entry,fbt::*SYNCHRONIZE*:entry'{printf("%Y",walltimestamp);}'
dtrace: description 'fbt::*sd_uscsi_strategy:entry,fbt::*SYNCHRONIZE*:entry'
matched 6 probes
CPU ID FUNCTION:NAME
2 83446 ssd_uscsi_strategy:entry 2007 Apr 23 16:07:39
1 83446 ssd_uscsi_strategy:entry 2007 Apr 23 16:10:26
0 43849 sd_uscsi_strategy:entry 2007 Apr 23 16:10:55
2 43849 sd_uscsi_strategy:entry 2007 Apr 23 16:11:46
3 83446 ssd_uscsi_strategy:entry 2007 Apr 23 16:12:24
3 43849 sd_uscsi_strategy:entry 2007 Apr 23 16:12:54
0 43849 sd_uscsi_strategy:entry 2007 Apr 23 16:13:30
2 83446 ssd_uscsi_strategy:entry 2007 Apr 23 16:14:07
0 83446 ssd_uscsi_strategy:entry 2007 Apr 23 16:14:16
0 83446 ssd_uscsi_strategy:entry 2007 Apr 23 16:14:19
^C
I should be getting those cache flushes every 5s - right?
The question is why I observer different behavior?
There're definitely both reads and writes all the time.
And on that hosts we're observing performance problems so maybe it's
somehow related?
Also sync() can take several minutes to complete...
Do you have any idea?
bash-3.00#
bash-3.00# zpool iostat 1
capacity operations bandwidth
pool used avail read write read write
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 1.22K 405 5.04M 5.07M
misc 20.6M 52.0G 0 0 21 0
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 2.14K 11 8.05M 1.49M
misc 20.6M 52.0G 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 2.03K 6 11.9M 888K
misc 20.6M 52.0G 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 2.19K 10 11.6M 1.36M
misc 20.6M 52.0G 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 2.03K 1 7.47M 253K
misc 20.6M 52.0G 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 1.89K 13 11.8M 1.73M
misc 20.6M 52.0G 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
f3-1 494G 730G 2.30K 8 22.6M 1.11M
misc 20.6M 52.0G 0 0 0 0
---------- ----- ----- ----- ----- ----- -----
^C
bash-3.00#
--
Best regards,
Robert mailto:[EMAIL PROTECTED]
http://milek.blogspot.com
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