[lustre-discuss] Quick ZFS pool question?

[Dilger, Andreas]

On Oct 13, 2016 19:02, Riccardo Veraldi <Riccardo.Veraldi at cnaf.infn.it> wrote:
> 
> Hello,
> will the lustre 2.9.0 rpm be released on the Intel site ?
> Also the latest rpm for zfsonlinux  available is 0.6.5.8

The Lustre 2.9.0 packages will be released, when the release is complete.
You are welcome to test the pre-release version from Git, if you are 
interested.

You are also correct that the ZoL 0.7.0 release is not yet available.
There are still improvements when using ZoL 0.6.5.8, but some of these
patches only made it into 0.7.0.

Cheers, Andreas

> On 13/10/16 11:16, Dilger, Andreas wrote:
>> On Oct 13, 2016, at 10:32, E.S. Rosenberg <esr+lustre at mail.hebrew.edu> wrote:
>>> On Fri, Oct 7, 2016 at 9:16 AM, Xiong, Jinshan <jinshan.xiong at intel.com> wrote:
>>> 
>>>>> On Oct 6, 2016, at 2:04 AM, Phill Harvey-Smith <p.harvey-smith at warwick.ac.uk> wrote:
>>>>> 
>>>>> Having tested a simple setup for lustre / zfs, I'd like to try and
>>>>> replicate on the test system what we currently have on the production
>>>>> system, which uses a much older version of lustre (2.0 IIRC).
>>>>> 
>>>>> Currently we have a combined mgs / mds node and a single oss node.
>>>>> we have 3 filesystems : home, storage and scratch.
>>>>> 
>>>>> The MGS/MDS node currently has the mgs on a seperate block device and
>>>>> the 3 mds on a combined lvm volume.
>>>>> 
>>>>> The OSS has an ost each (on a separate disks) for scratch and home
>>>>> and two ost for storage.
>>>>> 
>>>>> If we migrate this setup to a ZFS based one, will I need to create a
>>>>> separate zpool for each mdt / mgt / oss  or will I be able to create
>>>>> a single zpool and split it up between the individual mdt / oss blocks,
>>>>> if so how do I tell each filesystem how big it should be?
>>>> We strongly recommend to create separate ZFS pools for OSTs, otherwise grant, which is a Lustre internal space reserve algorithm, won’t work properly.
>>>> 
>>>> It’s possible to create a single zpool for MDTs and MGS, and you can use ‘zfs set reservation=<space> <target>’ to reserve spaces for different targets.
>>> I thought ZFS was only recommended for OSTs and not for MDTs/MGS?
>> The MGT/MDT can definitely be on ZFS.  The performance of ZFS has been
>> trailing behind that of ldiskfs, but we've made significant performance
>> improvements with Lustre 2.9 and ZFS 0.7.0.  Many people use ZFS for the
>> MDT backend because of the checksums and integrated JBOD management, as
>> well as the ability to create snapshots, data compression, etc.
>> 
>> Cheers, Andreas
>> 
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>> 
> 
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