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How to find the process details of a disk (in solaris)

Hello Experts,

We are having an issue like this. When we do 'iostat -x' on a solaris box, we see a particular metadevice is showing High Read cycle and %b column is more than 90% always.

root@maty1 # iostat -x 2
                  extended device statistics
device       r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
ssd19      555.0    8.5 4667.8   68.0  0.0  2.5    4.4    0      97.

This particular metadevice 'ssd19' is a part of metaset of a shared disk storage between a two node cluster. Since it is a part of metaset, there is no specific mount point available for this metadevice so that we can identify the process which is causing the high read cycles. So we tried to find out the actual disks which constitute the creation of this metadevice 'ssd19' and finally we found those.

Now my question is.....I have 4 disks which are part of a metaset, having this information how can I find the processes which are accessing it and which are causing high read cycles?  
(Please note that I have no mount point details).

Please get me a solution asap.

Thanks in advance !


 



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amandowara
Asked:
amandowara
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2 Solutions
 
peter991Commented:
iosnoop is a freeware program that uses DTrace to monitor disk events live. The default output prints
straightforward details such as PID, block address and size

More to read here:
http://www.brendangregg.com/Perf/paper_diskubyp1.pdf
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amandowaraAuthor Commented:
Hi Peter, will this tool works for Solaris 9 ?
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peter991Commented:
Hi!
Made a search on sunsolve and sunfreeware with no results :-/
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Brian UtterbackPrinciple Software EngineerCommented:
Unfortunately, dtrace is not available for Solaris 9.

Your best bet in this regard is to use a facility called "TNF".  See evelopers.sun.com/solaris/articles/tnf.html and
developers.sun.com/solaris/developer/support/driver/notes/iotracing.pdf  for info.
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amandowaraAuthor Commented:
Hi Peter, thanks for the excellent document.
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