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<p>I realize I didn't answer all the questions, so:</p>
<p>1) For a file-system-level view, we use ltop, a handy utility
that's in the LMT package (<a class="moz-txt-link-freetext" href="https://github.com/LLNL/lmt">https://github.com/LLNL/lmt</a>). If you
want to pinpoint OST or MDT tests, you could lock a file/dir to a
particular OST/MDT and then use 'zpool iostat ...' to monitor I/O
for that device</p>
<p>2) Again, I'd recommend getting ltop. 'zpool iostat' can give you
numerous performance statistics as well.<br>
</p>
<br>
<div class="moz-cite-prefix">On 09/12/2018 04:11 PM, Cameron Harr
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:70009567-aecc-96b9-9c16-eb5e7e280141@llnl.gov">
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<p>Use 'zpool iostat -v ...'. You can review the man page for lots
of options, including latency statistics.</p>
<p>Cameron<br>
</p>
<br>
<div class="moz-cite-prefix">On 09/10/2018 11:21 AM, Zeeshan Ali
Shah wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJSm=nvrzrRN21n+=oCKgksrEX8qB=OaQAKw0b9eq-p6ZuwPhQ@mail.gmail.com">
<div dir="ltr">Dear All,
<div><br>
</div>
<div>Suddenly our lustre installation become dead slow,
copying data from local source to lustre result around
20MB/sec before it was above 600 MB.</div>
<div><br>
</div>
<div>i checked zfs status -xv and (all pool healths are ok)</div>
<div><br>
</div>
<div>1) How to check which OSTs are involved during data write
operation ?</div>
<div>2) How to check Meta data (read and write) stats ?</div>
<div>3) any other advice to drill down the reason ..</div>
<div><br>
</div>
<div><br>
</div>
<div>/Zeeshan</div>
</div>
<br>
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