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Hi Anna,
<div>Beyond the number and size of OSTs and MDTs there isn't much information about the underlying storage available on the client. </div>
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<div>The "lfs df -v" command will print a "f" at the end for flash (non-rotational) devices, if the storage is properly configured. The "osc*.imports " parameter file will contain some information about the grant_block_size that can be used to distinguish
ldiskfs (4096) vs. zfs backends (131072 or 1048576). </div>
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<div>The size of the disks can often be inferred from 1/8 of the total OST size for standard 8+2 RAID configs, but this may vary and no actual device-level metrics are available on the client. </div>
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<div>Even on the server, Lustre itself doesn't know or care much about the underlying storage devices beyond (non-)rotational state, so we don't track any of that. <br>
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<div dir="ltr">Cheers, Andreas</div>
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<blockquote type="cite">On Jan 21, 2023, at 01:16, Anna Fuchs via lustre-discuss <lustre-discuss@lists.lustre.org> wrote:<br>
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<blockquote type="cite">
<div dir="ltr"> Hi, <br>
<br>
is it possible for a user (no root, so ssh to server) to find out the configuration of an OST?<br>
How many devices are there in one OST 'pool' (for both ldiskfs and ZFS) and even which type of devices they are (nvme, ssd, hdd)? Maybe even speeds and raid-levels?<br>
<br>
Additionally, how can a user find out the mapping of all available OSTs to OSSs easily?<br>
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Thanks<font size="4"><font face="monospace"><br>
</font></font>Anna<font size="4"><font face="monospace"><br>
</font></font>
<pre class="moz-signature" cols="72">--
Anna Fuchs
Universität Hamburg
<a class="moz-txt-link-freetext" href="https://wr.informatik.uni-hamburg.de">https://wr.informatik.uni-hamburg.de</a>
<a class="moz-txt-link-abbreviated" href="mailto:anna.fuchs@informatik.uni-hamburg.de">anna.fuchs@informatik.uni-hamburg.de</a>
<a class="moz-txt-link-freetext" href="https://wr.informatik.uni-hamburg.de/people/anna_fuchs">https://wr.informatik.uni-hamburg.de/people/anna_fuchs</a></pre>
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