[lustre-discuss] Mistake while removing an OST

[Andreas Dilger]

You should just be able to run the "writeconf" process to regenerate the config logs. The removed OST will not re-register with the MGS, but all of the other servers will, so it should be fine.

Cheers, Andreas

On Feb 1, 2023, at 03:48, BALVERS Martin via lustre-discuss <lustre-discuss at lists.lustre.org> wrote:


Hi,

I have a defective OSS with a single OST that I was tying to remove from the lustre filesystem completely (2.15.1). I was following https://doc.lustre.org/lustre_manual.xhtml#lustremaint.remove_ost
I had drained the OST and was now using the commands with llog_cancel to remove the config. This is where it went wrong. I first deleted attach, setup, add_osc indexes for the ‘client’ and then needed to also delete those for MDT0000 and MDT0001, but I accidentally removed two more indexes from the ‘client’.
Now I have incomplete client llogs for one OST, I am missing the add_uuid and attach lines for OST0002.

[root at mds ~]# lctl --device MGS llog_print lustre-client
- { index: 34, event: add_uuid, nid: 192.168.2.3 at tcp(0x20000c0a80203), node: 192.168.2.3 at tcp }
- { index: 35, event: attach, device: lustre-OST0001-osc, type: osc, UUID: lustre-clilov_UUID }
- { index: 36, event: setup, device: lustre-OST0001-osc, UUID: lustre-OST0001_UUID, node: 192.168.2.3 at tcp }
- { index: 37, event: add_osc, device: lustre-clilov, ost: lustre-OST0001_UUID, index: 1, gen: 1 }

- { index: 42, event: setup, device: lustre-OST0002-osc, UUID: lustre-OST0002_UUID, node: 192.168.2.4 at tcp }
- { index: 43, event: add_osc, device: lustre-clilov, ost: lustre-OST0002_UUID, index: 2, gen: 1 }

Is there a way to recover from this ?

I hope someone can help.

Regards,
Martin Balvers
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