[lustre-devel] RFC: Spill device for Lustre OSD

[Andreas Dilger]

On Nov 4, 2025, at 4:54 PM, Jinshan Xiong <jinshanx at google.com> wrote:
> On Tue, Nov 4, 2025 at 3:48 PM Andreas Dilger <adilger at dilger.ca> wrote:
>> 
>> If the overhead of a local Lustre mount on the OSS is problematic, that
>> seems like something which could/should be fixed?  The local mounts are
>> already "non-recoverable" so that they do not get an entry in last_rcvd
>> and their absence does not cause any recovery issues.
>> 
>> The main issue we've seen with local mountpoints is that this can confuse
>> HA and prevent Lustre module unloading if they are not taken into account
>> during cleanup.
> 
> You're right. That's actually why we didn't do it in the first place. If an OSS crashes, it will definitely lead to recovery timeout and client eviction.

If an OSS crash with a local mountpoint is causing recovery timeouts,
then that seems like a bug to be fixed.  This was changed by Alex Z.
in patch "LU-12722 target: disable recovery for local clients" back in
commit v2_13_52-45-g8bd04b4e57.

Cheers, Andreas





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