[lustre-discuss] lustre 2.10.* and zfs record size

[Andreas Dilger]

Firstly, we don't test anything larger than 1MB.

Secondly, the best recordsize is up to the apication IO pattern. If it is streaming writes, it might be OK. If it is random write then probably not.

Cheers, Andreas

On Sep 27, 2018, at 19:04, Riccardo Veraldi <Riccardo.Veraldi at cnaf.infn.it<mailto:Riccardo.Veraldi at cnaf.infn.it>> wrote:


Hello,

I have always been using ZFS record size to 1MB with Lustre on top of ZFS.  Anyway it is possible to set it to more than 1MB. May this have any benefit in performance and is it recommended to set for example:

echo 4194304 > /sys/module/zfs/parameters/zfs_max_recordsize

zfs set recordsize=4m zpool




Thank you.

Rick


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