[lustre-discuss] Permanently remove osts: tunefs writeconf on zfs osts

Stephane Thiell sthiell at stanford.edu
Sat Aug 13 20:23:14 PDT 2016

Hi Fernando,

To remove your old and empty OSTs during a maintenance: stop your filesystem, do the writeconf on all targets and remount your MGS/MDS and then all OSTs minus the old ones.

With shine, stop your filesystem, comment out the old OST lines in the fs model file and type “shine update”.

Doing so is _almost_ permanent, indeed care should be taken when reusing indexes of removed OSTs.

Good luck,

> On Aug 13, 2016, at 12:27 PM, Fernando Pérez <fperez at icm.csic.es> wrote:
> Dear all.
> I have a lustre filesystem with one combined mdt / mgs, some old ldiskfs osts and other new zfs osts.
> I need to remove some old ldiskfs osts. Currently these osts are empty (I deactivated these osts and then I migrated all the files before).
> What is the correct way to permanent deactivate and remove these osts? Deactivate them using lctl and then regenerate lustre configuration files logs using tunefs according to chapter 14 in the lustre documentation?
> My question is due to the zfs osts, Do I need to run tunefs.lustre —writeconf on these zfs osts?
> Regards.  
> =============================================
> Fernando Pérez
> Institut de Ciències del Mar (CMIMA-CSIC)
> Departament Oceanografía Física i Tecnològica
> Passeig Marítim de la Barceloneta,37-49
> 08003 Barcelona
> Phone:  (+34) 93 230 96 35
> =============================================
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