[lustre-discuss] OST mount issue

Degremont, Aurelien degremoa at amazon.com
Mon Apr 26 00:35:02 PDT 2021

Hello Steve,

This message appears when you are using Lustre modules built with only client support, with server support disabled.
This message is quite new and only appears in very recent Lustre releases. What Lustre version are you using, this error does not exist in 2.12.6 as far as I know.

Could you double check the Lustre version and RPMs you installed on that host, compare with the other and ensure they are the same?
Could you simply try: 'modprobe mdt' and see if that works?

Check also: 'lctl get_param version'


Le 25/04/2021 15:10, « lustre-discuss au nom de Steve Thompson » <lustre-discuss-bounces at lists.lustre.org au nom de smt at vgersoft.com> a écrit :

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    Two CentOS 7.9 hosts with kernel 3.10.0-1160.21.1.el7.x86_64, using ZFS
    0.8.5 with lustre 2.12.6. One system works perfectly, whereas the second
    host fails to mount the OST, with this message from the mount:

    mount.lustre: mount fs1/ost1 at /mnt/fs1/ost1 failed: Invalid argument

    and this confusing message in the log:

    Apr 25 08:56:18 fs1 kernel: LustreError: 27722:0:(obd_mount.c:1597:lustre_fill_super())
            This is client-side-only module, cannot handle server mount.

    Can someone please point me to the error? BTW, the two systems were both
    kickstarted from the same repo, so as far as I can tell, they are
    identical. The lustre RPMs were installed from the server repo.


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