[Lustre-discuss] OSS and MDS resilience to power failures

Wojciech Turek wjt27 at cam.ac.uk
Fri Jan 13 03:13:08 PST 2012

Make sure that use use RAID controller's with cache protected by battery
backup and if you use redundant controllers that the cache mirroring
feature is enabled. The ldiskfs (ext4) should recover after power failures
with no problems as long as the back end storage recovers fine too.

Best regards,


On 13 January 2012 11:01, Alexander Oltu <Alexander.Oltu at uni.no> wrote:

> Hi,
> We are going to have a Lustre setup with around 1000 clients. Due to a
> power cable constraints we are not able to provide power to OSS and MDS
> servers from UPS.
> Therefore the question is how resilient is Lustre to OSS and/or MDS
> power failures?
> We have quite few thunderstorms here during summer with short power
> interruptions. I understand that ext4 is a journaling filesystem and
> should be more or less stable to power interruptions. But the real
> practice can be different. I believe that some of you have experience
> of running OSS and MDS without UPS and can shed some light on this
> topic.
> Thank you,
> Alex.
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