[lustre-discuss] Changing OST servicenode

[Spitz, Cory James]

If you are only changing the nid then you do not need to follow the full writeconf procedure.

See https://doc.lustre.org/lustre_manual.xhtml#lustremaint.changingservernid :
If you need to change only the NID of the MDT or OST, the replace_nids command can simplify this process. The replace_nids command differs from tunefs.lustre --writeconf in that it does not erase the entire configuration log, precluding the need the need to execute the writeconf command on all servers and re-specify all permanent parameter settings. However, the writeconf command can still be used if desired.


Note that you still need to unmount per the replace_nids procedure.

-Cory

On 11/16/22, 6:20 AM, "lustre-discuss" <lustre-discuss-bounces at lists.lustre.org> wrote:

Hi,

We want to change the service node of an OST.  We think this involves:
1. umount the OST
2. tunefs.lustre --erase-param failover.node --servicenode=172.18.100.1 at o2ib,172.17.100.1 at tcp pool1/ost1

Is this all?  Unclear from the documentation whether a writeconf is
required (if it is, then we'd need to dismount the whole file system, and
take it all down, and writeconf every ost/mdt/mgt and then mount them in
order).

Thanks,
Alastair.
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