[xymon] iostat monitor
Vernon Everett
everett.vernon at gmail.com
Thu Sep 16 04:16:28 CEST 2010
Hi Daniel
This is significantly different to the Solaris output. Linux gives a few
extra fields, and leaves out a few that Solaris has.
We may need to play with this to find some common ground.
Alternatively, we just accept and embrace the differences, and add a few
extra graphs.
We then set a SUBTEST string within the case statement.
The loop will then be
for subtest in $SUBTEST
The output I used was as below.
Make yours look similar, and we have a winner.
The output then gets massaged a little with this set of commands (commented
for clarity)
cat $TEMPFILE.raw | awk "NR>$LINE" \ # take only the last set
| sed "s/,/ /g" \ # make it space seperated
| awk '{ print $NF" "$0 }' \ # move device name to front
| awk '{ $NF="";print }' > $TEMPFILE.data # Dump the
device name at the end
iostat -xrn 2 2
extended device statistics
r/s,w/s,kr/s,kw/s,wait,actv,wsvc_t,asvc_t,%w,%b,device
1.4,3.9,93.0,68.8,0.0,0.2,0.0,47.0,0,3,vdc0
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.2,0,0,vdc1
1.4,4.0,92.8,68.8,0.0,0.3,0.0,61.0,0,4,vdc2
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,blackbox:/data/scratch
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,infdomB1:/export/DRhome
0.0,0.0,0.0,0.0,0.0,0.0,0.0,1.7,0,0,infdomB1:/export/home
0.0,0.0,0.0,0.0,0.0,0.0,0.0,9.1,0,0,infdomD2:/data/software
extended device statistics
r/s,w/s,kr/s,kw/s,wait,actv,wsvc_t,asvc_t,%w,%b,device
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,vdc0
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,vdc1
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,vdc2
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,blackbox:/data/scratch
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,infdomB1:/export/DRhome
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,infdomB1:/export/home
0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0,0,infdomD2:/data/software
>From man iostat
-n Display names in descriptive format. For exam-
ple, cXtYdZ, rmt/N, server:/export/path.
-r Display data in a comma-separated format.
-x Report extended disk statistics.
Output
The output of the iostat utility includes the following
information.
device name of the disk
r/s reads per second
w/s writes per second
kr/s kilobytes read per second
The average I/O size during the interval can be
computed from kr/s divided by r/s.
kw/s kilobytes written per second
The average I/O size during the interval can be
computed from kw/s divided by w/s.
wait average number of transactions waiting for service
(queue length)
This is the number of I/O operations held in the
device driver queue waiting for acceptance by the
device.
actv average number of transactions actively being ser-
viced (removed from the queue but not yet com-
pleted)
This is the number of I/O operations accepted, but
not yet serviced, by the device.
svc_t average response time of transactions, in mil-
liseconds
The svc_t output reports the overall response
time, rather than the service time, of a device.
The overall time includes the time that transac-
tions are in queue and the time that transactions
are being serviced. The time spent in queue is
shown with the -x option in the wsvc_t output
column. The time spent servicing transactions is
the true service time. Service time is also shown
with the -x option and appears in the asvc_t out-
put column of the same report.
%w percent of time there are transactions waiting for
service (queue non-empty)
%b percent of time the disk is busy (transactions in
progress)
wsvc_t average service time in wait queue, in mil-
liseconds
asvc_t average service time of active transactions, in
milliseconds
wt the I/O wait time is no longer calculated as a
percentage of CPU time, and this statistic will
always return zero.
Cheers
Vernon
On Wed, Sep 15, 2010 at 10:27 PM, Daniel Bourque
<dbourque at weatherdata.com>wrote:
> here is a sample run.
> $ iostat -xd 5 2
> Linux 2.6.18-92.1.22.el5PAE (host.bla.com) 09/15/2010
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
> avgqu-sz await svctm %util
> sda 0.00 0.00 0.00 0.00 0.07 0.00 92.89
> 0.00 4.31 3.78 0.00
> sdb 23.63 8.98 21.65 27.30 14.39 120.96 2.77
> 0.10 1.95 1.55 7.59
> dm-0 0.00 0.00 0.11 3.01 2.27 24.08 8.44
> 0.04 11.50 1.04 0.32
> dm-1 0.00 0.00 0.34 1.80 6.38 14.38 9.71
> 0.02 10.15 1.59 0.34
> dm-2 0.00 0.00 0.00 0.33 0.01 2.62 8.00
> 0.00 7.70 3.09 0.10
> dm-3 0.00 0.00 0.47 28.77 33.15 90.77 4.24
> 0.06 2.03 0.17 0.51
> dm-4 0.00 0.00 0.00 0.00 0.00 0.00 8.00
> 0.00 18.27 2.54 0.00
> dm-5 0.00 0.00 44.45 2.42 111.93 123.38 5.02
> 0.02 0.37 1.59 7.45
> drbd0 0.00 0.00 44.45 128.36 111.89 51.42 4.88
> 0.10 3.45 3.94 13.17
>
> Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
> avgqu-sz await svctm %util
> sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00
> sdb 0.00 35.40 3.80 69.20 32.00 821.20 11.69
> 0.04 0.59 0.52 3.76
> dm-0 0.00 0.00 0.20 2.80 3.20 22.40 8.53
> 0.00 1.13 1.13 0.34
> dm-1 0.00 0.00 0.00 1.80 0.00 14.40 8.00
> 0.00 0.00 0.00 0.00
> dm-2 0.00 0.00 0.00 0.60 0.00 4.80 8.00
> 0.00 0.00 0.00 0.00
> dm-3 0.00 0.00 0.00 2.00 0.00 16.00 8.00
> 0.00 0.00 0.00 0.00
> dm-4 0.00 0.00 0.00 0.00 0.00 0.00 0.00
> 0.00 0.00 0.00 0.00
> dm-5 0.00 0.00 3.60 97.40 28.80 761.00 7.82
> 0.04 0.40 0.34 3.40
> drbd0 0.00 0.00 3.60 94.80 28.80 758.40 8.00
> 0.09 0.96 0.56 5.48
>
>
> I whish the maintainer of iostat would add a friendly name option, it would
> not be so hard to code a device-mapper -> LVM translation using "dmsetup ls"
> , problem is you can only run that command as root. ( guess you could add a
> sudo rule... )
>
> anyways, if you don't find the time to work on this, just just provide a
> sample output of solaris's /usr/bin/iostat -xrn and I'll post the changes
> needed to the list.
>
> Thank !
>
>
> Dan
>
>
>
> Vernon Everett wrote:
>
>> Could give it a go.
>> Send me the output of iostat -x 2 2 for your favourite OS(s)
>>
>> Where I am now, I only have Solaris, hence the bias.
>>
>> Cheers
>> V
>>
>>
>> On Wed, Sep 15, 2010 at 5:22 AM, Daniel Bourque <dbourque at weatherdata.com<mailto:
>> dbourque at weatherdata.com>> wrote:
>>
>> Sorry I can't reply to the thread for some reason i quit receiving
>> the emails, I checked the archive and noticed the replies to my
>> former thread. ( thanks ! )
>>
>> Vernon, since I don't run solaris here, only linux and some tru64,
>> the -r ( csv output ) and -n ( friendly names ) options makes it
>> hard to use your shell script since they either don't exists or
>> don't work the same. Can you perhaps provide a same output of
>> "iostat -xrn" and along with formated text you pass to hobbit in
>> your check.
>>
>> I can then provide a snippet of code for linux, which would
>> provide the equivalent output. So you could just add a case in the
>> shell script.
>>
>>
>> case `uname` in
>> Linux)
>> /usr/bin/iostat -x $DURATION 2 | wonderful stuff > $TEMPFILE.raw
>> ;;
>> SunOS)
>> /usr/bin/iostat -xrn $DURATION 2 > $TEMPFILE.raw
>> ;;
>> esac
>>
>>
>>
>> -- Dan
>>
>>
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>>
>>
>>
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