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I sounds like this issue, but I'm not sure what your dnodesize is:<br>
<br>
<a class="moz-txt-link-freetext" href="https://github.com/openzfs/zfs/issues/8458">https://github.com/openzfs/zfs/issues/8458</a><br>
<br>
ZFS 0.8.1+ on the receiving side should fix it. Then again ZFS 0.8
is not supported in Lustre 2.12, so it's a bit hard to restore,
without copying the underlying devices.<br>
<br>
Cheers,<br>
Hans Henrik<br>
<br>
<div class="moz-cite-prefix">On 06.11.2020 21.23, Steve Thompson
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:8f1f3013-7c2a-9d62-3542-79d9b2c3bf8@vgersoft.com">This
may be a question for the ZFS list...
<br>
<br>
I have Lustre 2.12.5 on Centos 7.8 with ZFS 0.7.13, 10GB network.
I make snapshots of the Lustre filesystem with 'lctl
snapshot_create' and at a later time transfer these snapshots to a
backup system with zfs send/recv. This works well for everything
but the MDT. For the MDT, I find that the zfs recv always fails
when a little less than 1GB has been transferred (this being an
incremental send/recv of snapshots taken a day apart):
<br>
<br>
# zfs send -v -c -i fs0pool/mdt0@03-nov-2020
fs0pool/mdt0@04-nov-2020 | \
<br>
zfs recv -F backups/fs0pool/mdt0
<br>
....
<br>
12:11:18 946M fs0pool/mdt0@04-nov-2020-01:00
<br>
12:11:19 946M fs0pool/mdt0@04-nov-2020-01:00
<br>
12:11:20 946M fs0pool/mdt0@04-nov-2020-01:00
<br>
cannot receive incremental stream: dataset does not exist
<br>
<br>
while if the data transfer is much smaller, the send/recv works.
Since once I get a failure it is not possible to complete a
send/recv for any subsequent day, I am doing a full snapshot send
to a file; this always works and takes about 5/6 minutes for my
MDT. When using zfs send/recv, the recv is always very very slow
(several hours to get to the above failure point, even when using
mbuffer). I am using custom zfs replication scripts, but it fails
also using the zrep package.
<br>
<br>
Does anyone know of a possible explanation? Is there any version
of ZFS 0.8 that works with Lustre 2.12.5?
<br>
<br>
Thanks,
<br>
Steve
<br>
</blockquote>
<br>
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