[Lustre-discuss] Swap on Lustre (was: Client is not accesible when OSS/OST server is down)

[Serge Ryabchun]

Hi Robin,

2008/5/1, Robin Humble <rjh+lustre at cita.utoronto.ca>:
>
>  I tried that with o2ib last week and as pretty much as soon as I use
>  any swap the node deadlocks hard in the low memory situation and has to
>  be reset.
>  possibly it's more to do with how loop.c uses aops and alloc's mem than
>  it is to do with Lustre, but either way, sadly, it's not a solution.
>
>  swap to iSER (backed by a file on Lustre on another server) has worked
>  and survived harsh testing for me in the past, as has swap over iSCSI
>  (TCP) when the clients have Peter Zijlstra's VM deadlock prevention
>  patches applied. presumably swap to SRP would work too. there are now
>  software targets available for all of these protocols now which is
>  nice.

Khm, in one of our project X-terminals use swap on NFS with Peter's patch. But
in tests loop on file on NFS without VM patch was very stable. X-terminal has
16MB memory.

And yes, I use swap on Lustre as tmpfs.

mount -t tmpfs -o size=64G tmpfs /tmp

-- 
Serge Ryabchun <serge.ryabchun at gmail.com>