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тАО06-12-2009 04:52 AM
тАО06-12-2009 04:52 AM
I get some high % busy on the disk from time to time, with corresponding low % CPU idle. This usually lasts only for a few seconds. Does this mean that my system is very close to trouble, or is this normal?
sar -d
15:23:48
15:23:49
15:23:50
15:23:51 c2t6d0 25.00 0.50 94 1504 4.50 2.76
15:23:52 c2t6d0 98.00 158.35 555 8880 173.49 8.15
15:23:53 c2t6d0 94.00 0.50 334 5318 5.37 2.74
15:23:54 c2t6d0 97.00 0.50 380 6080 5.00 2.43
15:23:55 c2t6d0 91.00 0.50 363 5808 4.81 2.55
15:23:56 c2t6d0 13.00 0.50 51 816 5.16 2.74
15:23:57
15:23:58 c2t6d0 53.00 200.23 437 6992 214.96 9.62
sar -u
xxxxxxxx %usr %sys %wio %idle
15:23:48 0 0 0 100
15:23:49 0 0 0 100
15:23:50 0 0 0 100
15:23:51 9 3 31 57
15:23:52 8 8 84 0
15:23:53 5 5 90 0
15:23:54 1 2 97 0
15:23:55 7 2 91 0
15:23:56 1 1 4 94
15:23:57 0 0 0 100
15:23:58 0 0 0 100
Solved! Go to Solution.
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тАО06-12-2009 05:04 AM
тАО06-12-2009 05:04 AM
Re: Interpret sar -d sar -u readings, disk % busy
You don't offer enough information to other than comment about possibilities.
I presume that this disk is your boot disk (vg00).
Are you swapping? Look at:
# swapinfo -tam
# vmstat
For 'vmstat' look at the page-out activity. Low numbers are good. Values > 10 indicate memory pressure.
Is your dynamic buffer cache 'dbc_max_pct' too high such that too many file buffers are in memory and when 'syncer' runs (every 30-seconds) your CPU is taxed?
If you have 'glance' that would offer an easy insight.
Regards!
...JRF...
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тАО06-12-2009 05:09 AM
тАО06-12-2009 05:09 AM
SolutionWhat you should pay attention to is avserv and avque numbers - avserv of over 10ms might indicate a problem, and of over 20ms is certainly a problem. You have a fairly heft avque number for 1 second as well, which in turn leads to a fairly large avwait for 1 second as well.
Whether this spells trouble for your server depends what it is doing - what application is running on the system and writing to this disk?
HTH
Duncan
I am an HPE Employee
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тАО06-12-2009 05:14 AM
тАО06-12-2009 05:14 AM
Re: Interpret sar -d sar -u readings, disk % busy
Yes, this is the boot disk (only 1 disk in system)
Unfortunately I do not have the Glance Sw, it says "license expired"
The vmstat readings and swapinfo looks good as far as I can see. (Page pi and po usually 0)
I have not looked at the dynamic buffer cache, where is this setting?
swapinfo
Kb Kb Kb PCT START/ Kb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 524288 0 524288 0% 0 - 1 /dev/vg00/lvol2
reserve - 204376 -204376
vmstat:
procs memory page faults cpu
r b w avm free re at pi po fr de sr in sy cs us sy id
1 1 0 11206 43173 0 0 0 0 0 0 0 163 1191 67 0 1 99
1 1 0 11206 43173 0 0 0 0 0 0 0 170 2382 72 11 2 87
1 1 0 11206 43173 0 0 0 0 0 0 0 169 1983 65 1 1 98
1 1 0 11206 43173 0 0 0 0 0 0 0 182 2680 76 1 2 97
1 1 0 11206 43173 0 0 0 0 0 0 0 261 2739 186 5 5 90
2 1 0 11742 43173 0 0 0 0 0 0 0 354 3183 317 2 5 93
2 1 0 11742 43173 0 0 0 0 0 0 0 418 3551 420 4 7 89
2 1 0 11742 43173 0 0 0 0 0 0 0 466 3617 494 1 5 94
regards,
D
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тАО06-12-2009 05:20 AM
тАО06-12-2009 05:20 AM
Re: Interpret sar -d sar -u readings, disk % busy
these are kernel parameters. Please run this command to see what they are set to
kmtune | grep ^dbc
UNIX because I majored in cryptology...
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тАО06-12-2009 05:34 AM
тАО06-12-2009 05:34 AM
Re: Interpret sar -d sar -u readings, disk % busy
Could not find the kmtune on my system, is this not included in HP-UX?
The application that is running is a logging application. It is supposed to spread its disk writing out over time, but from these results it seems not to work well.
(A more readable swapinfo:
# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 512 0 512 0% 0 - 1 /dev/vg00/lvol2
reserve - 199 -199
total 512 199 313 39% - 0 -
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тАО06-12-2009 05:36 AM
тАО06-12-2009 05:36 AM
Re: Interpret sar -d sar -u readings, disk % busy
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тАО06-12-2009 05:39 AM
тАО06-12-2009 05:39 AM
Re: Interpret sar -d sar -u readings, disk % busy
Regards,
D
# sysdef
NAME VALUE BOOT MIN-MAX UNITS FLAGS
acctresume 4 - -100-100 -
acctsuspend 2 - -100-100 -
allocate_fs_swapmap 0 - - -
bufpages 13107 - 0- Pages -
create_fastlinks 1 - - -
dbc_max_pct 10 - - -
dbc_min_pct 10 - - -
default_disk_ir 1 - - -
dskless_node 0 - 0-1 -
eisa_io_estimate 1536 - - -
eqmemsize 17 - - -
file_pad 10 - 0- -
fs_async 0 - 0-1 -
hpux_aes_override 0 - - -
maxdsiz 503866 - 256-655360 Pages -
maxfiles 240 - 30-2048 -
maxfiles_lim 2048 - 30-2048 -
maxssiz 20396 - 256-655360 Pages -
maxswapchunks 1024 - 1-16384 -
maxtsiz 262144 - 256-655360 Pages -
maxuprc 150 - 3- -
maxvgs 10 - - -
msgmap 65470464 - 3- -
nbuf 7584 - 0- -
ncallout 1560 - 6- -
ncdnode 150 - - -
ndilbuffers 30 - 1- -
netisr_priority -1 - -1-127 -
netmemmax 43630592 - - -
nfile 17622 - 14- -
nflocks 200 - 2- -
ninode 5728 - 14- -
no_lvm_disks 0 - - -
nproc 1544 - 10- -
npty 160 - 1- -
nstrpty 200 - - -
nswapdev 10 - 1-25 -
nswapfs 10 - 1-25 -
public_shlibs 1 - - -
remote_nfs_swap 0 - - -
rtsched_numpri 32 - - -
sema 0 - 0-1 -
semmap 98238464 - 4- -
shmem 0 - 0-1 -
shmmni 200 - 3-1024 -
streampipes 0 - 0- -
swapmem_on 0 - - -
swchunk 2048 - 2048-16384 kBytes -
timeslice 10 - -1-2147483648 Ticks -
unlockable_mem 6547 - 0- Pages -
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тАО04-14-2010 06:40 AM
тАО04-14-2010 06:40 AM