[lustre-discuss] lustre 2.10.* and zfs record size
robert.redl at lmu.de
Fri Sep 28 00:17:09 PDT 2018
I have a related question. The documentation says nothing about the
recommended recordsize for MDTs with ZFS backend. Are there any
recommendation? Or is data on MDTs stored in a way that the recordsize
does not matter?
On 09/28/2018 12:54 AM, Andreas Dilger wrote:
> 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>>
>> 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.
>> lustre-discuss mailing list
>> lustre-discuss at lists.lustre.org <mailto:lustre-discuss at lists.lustre.org>
> lustre-discuss mailing list
> lustre-discuss at lists.lustre.org
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