[lustre-discuss] ZFS w/Lustre problem

Faaland, Olaf P. faaland1 at llnl.gov
Wed Nov 18 10:04:52 PST 2020

Hi Steve,

You mentioned you may have a fix for zfs_send.c in ZFS.   Although Lustre tickles the bug, it's not likely that is the only way to tickle it.

Is there already a bug report for your issue at https://github.com/openzfs/zfs/issues?  If not, can you create one, even if your patch isn't successful?  That's the place to get your patch landed, and/or get help with the issue.


From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of Steve Thompson <smt at vgersoft.com>
Sent: Tuesday, November 10, 2020 5:06 AM
To: Hans Henrik Happe
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] ZFS w/Lustre problem

On Mon, 9 Nov 2020, Hans Henrik Happe wrote:

> I sounds like this issue, but I'm not sure what your dnodesize is:
> https://github.com/openzfs/zfs/issues/8458
> 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.

Hans Henrik,

Many thanks for your input. I had in fact known about the dnodesize issue,
and tested a workaround. Unfortunately, it turned out not to be this.
Instead, I have tested a patch to zfs_send.c, which does appear to have
solved the issue. The zfs send/recv is still running, however; if it
completes successfully, I will post again with details of the patch.

Steve Thompson                 E-mail:      smt AT vgersoft DOT com
Voyager Software LLC           Web:         http://www DOT vgersoft DOT com
3901 N Charles St              VSW Support: support AT vgersoft DOT com
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