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

[Robert Redl]

Dear All,

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?

Thanks,
Robert


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>>
> 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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>
>
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