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<p>rpc_stats on the clients may be helpful here, as a first step. They are found in /proc/fs/lustre/osc/[ost ]/rpc_stats on the client. Contents should be mostly self-explanatory. Look for lots of small RPCs.</p>
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<p>- Patrick</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Russell Dekema <dekemar@umich.edu><br>
<b>Sent:</b> Thursday, June 1, 2017 6:34:59 PM<br>
<b>To:</b> lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> [lustre-discuss] Per-client I/O Operation Counters</font>
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<div class="PlainText">Greetings,<br>
<br>
Is there a way, either on the Lustre clients or (preferably) OSSes, to<br>
determine how many I/O operations each Lustre client is performing<br>
against the filesystem?<br>
<br>
I know several ways of finding the number of *bytes* read or written<br>
by a client (or even on a per-job basis with job_stats), but we<br>
suspect we have some clients overwhelming our filesystem with large<br>
numbers of small I/O requests, and I don't know how to find per-client<br>
(or per-job) I/O operation counters.<br>
<br>
This is a Lustre 2.5 system.<br>
<br>
Sincerely,<br>
Rusty Dekema<br>
University of Michigan<br>
Advanced Research Computing - Technical Services<br>
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