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тАО09-08-2009 09:29 PM
тАО09-08-2009 09:29 PM
I wanted to capture the disk writes (Kb/s) information in a system with multiple LUNs. The system utilities sar and iostat provides the read+write together and I am unable to find a way to capture the write data specifically.
Is there a way to do it? If I have glance can I collect such data over a period of 24hours? What is the command options using glance to capture only the disk writes.
As usual the relevant answers will get points.
With regards,
Mohan.
Solved! Go to Solution.
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тАО09-08-2009 09:59 PM
тАО09-08-2009 09:59 PM
Re: Capturing Disk write data
also check this out:
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1165546
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тАО09-08-2009 10:34 PM
тАО09-08-2009 10:34 PM
Re: Capturing Disk write data
To check if you have it installed, see if you get any meaningful output from:
ovpa status
or
mwa status
HTH
Duncan
I am an HPE Employee
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тАО09-08-2009 11:45 PM
тАО09-08-2009 11:45 PM
Re: Capturing Disk write data
I pretty much zeroed-in to Glanceplus as I understood the system tools were not giving this info.
I do not have measureware or performance agent, only glanceplus is available. Hence I was trying to find if there are command line options using glance to capture such data.
Again, the captured data is to be used by another team to do some analysis, probably using Excel.
I am aware that I could use glance -j but I am not sure if that will capture the disk writes as a seperate entity.
With regards,
Mohan.
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тАО09-09-2009 12:12 AM
тАО09-09-2009 12:12 AM
SolutionCreate a file (I called it /tmp/disk_rw) with the following contents:
print "-------- device wKB/s"
disk loop {
print GBL_STATTIME, " ",BYDSK_DISKNAME|15,
BYDSK_PHYS_WRITE_BYTE_RATE|8|0
}
Then reference this from glance with a suitable interval:
glance -aos /tmp/disk_rw -j 10
That samples every 10 seconds.
HTH
Duncan
I am an HPE Employee
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тАО09-09-2009 12:25 AM
тАО09-09-2009 12:25 AM
Re: Capturing Disk write data
That is what I was looking for.
One small clarification in this, The interval is for every 10 seconds but is there a parameter to specify the count, that is, how many times the reading will be recorded?
I am assuming the given syntax will capture the information for each disk in the system.
With regards,
Mohan.
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тАО09-09-2009 12:43 AM
тАО09-09-2009 12:43 AM
Re: Capturing Disk write data
Well you can read the glance man page as well as I can!
glance -aos /tmp/disk_rw -j 10 -iterations 3
Note minimum number of iterations is 2
HTH
Duncan
I am an HPE Employee
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тАО09-09-2009 12:50 AM
тАО09-09-2009 12:50 AM
Re: Capturing Disk write data
Thanks to Duncan and Hakki for their time. Duncan had provided the information I was seeking for.
While I looked at the man pages, I wanted to know from people who have really used glance to capture such information and their direct inputs.
With regards,
Mohan.