[lustre-discuss] lustre 2.10.5 or 2.11.0

[Riccardo Veraldi]

On 10/17/18 1:20 PM, Kurt Strosahl wrote:
>
> Good Afternoon,
>
I believe 2.10.* is the long time support.

I am happy with 2.10.5 on my standard  performance cluster but for a 
very high performance cluster I built 5 months ago where 6GB/s per each OSS

where required in read and write transfers I had some problem with file 
locking using Lustre 2.10.3 when having many writers.

This issue did not show up with Lustre 2.11.0 so that I Went for it.

>
>     I'm in the early planning stages of a lustre upgrade.  We are 
> going to be moving from 2.5 to either 2.10 or 2.11, possibly by 
> standing up a new lustre file system alongside the existing one and 
> migrating the data over.  I'm wondering if anyone has had specific 
> experiences (either positive or negative) with either of these versions.
>
>
> I was also looking for, but couldn't seem to find, a mapping of zfs 
> versions to lustre versions.  Am I correct in my assumption that zfs 
> 0.7.9 will work with either version?
>
>
> Finally, does anyone have experience with zfs as the backing for the 
> MDS/MDT?
>
I have several MDS/MDT on ZFS and they are also virtual machines and I 
never had issues with them.


anyway especially regarding the OSSes you may eventually need some ZFS 
module parameters optimizations regarding vdev_write and vdev_read max 
to increase those values higher than default. You may also disable ZIL, 
change the redundant_metadata to "most" atime off.


I could send you a list of parameters that in my case work well.


>
> w/r,
>
> Kurt J. Strosahl
> System Administrator: HPC, Lustre
> Scientific Computing Group, Thomas Jefferson National Accelerator Facility
>
>
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