<div dir="ltr">you can have a better understanding of the gap from this presentation: <a href="http://www.eofs.eu/_media/events/lad16/02_zfs_md_performance_improvements_zhuravlev.pdf">ZFS metadata performance improvements</a></div><div class="gmail_extra"><br><div class="gmail_quote">On 14 October 2016 at 08:42, Dilger, Andreas <span dir="ltr"><<a href="mailto:andreas.dilger@intel.com" target="_blank">andreas.dilger@intel.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Oct 13, 2016 19:02, Riccardo Veraldi <<a href="mailto:Riccardo.Veraldi@cnaf.infn.it">Riccardo.Veraldi@cnaf.infn.it</a><wbr>> wrote:<br>
><br>
> Hello,<br>
> will the lustre 2.9.0 rpm be released on the Intel site ?<br>
> Also the latest rpm for zfsonlinux available is 0.6.5.8<br>
<br>
</span>The Lustre 2.9.0 packages will be released, when the release is complete.<br>
You are welcome to test the pre-release version from Git, if you are<br>
interested.<br>
<br>
You are also correct that the ZoL 0.7.0 release is not yet available.<br>
There are still improvements when using ZoL 0.6.5.8, but some of these<br>
patches only made it into 0.7.0.<br>
<br>
Cheers, Andreas<br>
<div class="HOEnZb"><div class="h5"><br>
> On 13/10/16 11:16, Dilger, Andreas wrote:<br>
>> On Oct 13, 2016, at 10:32, E.S. Rosenberg <<a href="mailto:esr%2Blustre@mail.hebrew.edu">esr+lustre@mail.hebrew.edu</a>> wrote:<br>
>>> On Fri, Oct 7, 2016 at 9:16 AM, Xiong, Jinshan <<a href="mailto:jinshan.xiong@intel.com">jinshan.xiong@intel.com</a>> wrote:<br>
>>><br>
>>>>> On Oct 6, 2016, at 2:04 AM, Phill Harvey-Smith <<a href="mailto:p.harvey-smith@warwick.ac.uk">p.harvey-smith@warwick.ac.uk</a>> wrote:<br>
>>>>><br>
>>>>> Having tested a simple setup for lustre / zfs, I'd like to try and<br>
>>>>> replicate on the test system what we currently have on the production<br>
>>>>> system, which uses a much older version of lustre (2.0 IIRC).<br>
>>>>><br>
>>>>> Currently we have a combined mgs / mds node and a single oss node.<br>
>>>>> we have 3 filesystems : home, storage and scratch.<br>
>>>>><br>
>>>>> The MGS/MDS node currently has the mgs on a seperate block device and<br>
>>>>> the 3 mds on a combined lvm volume.<br>
>>>>><br>
>>>>> The OSS has an ost each (on a separate disks) for scratch and home<br>
>>>>> and two ost for storage.<br>
>>>>><br>
>>>>> If we migrate this setup to a ZFS based one, will I need to create a<br>
>>>>> separate zpool for each mdt / mgt / oss or will I be able to create<br>
>>>>> a single zpool and split it up between the individual mdt / oss blocks,<br>
>>>>> if so how do I tell each filesystem how big it should be?<br>
>>>> We strongly recommend to create separate ZFS pools for OSTs, otherwise grant, which is a Lustre internal space reserve algorithm, won\u2019t work properly.<br>
>>>><br>
>>>> It\u2019s possible to create a single zpool for MDTs and MGS, and you can use \u2018zfs set reservation=<space> <target>\u2019 to reserve spaces for different targets.<br>
>>> I thought ZFS was only recommended for OSTs and not for MDTs/MGS?<br>
>> The MGT/MDT can definitely be on ZFS. The performance of ZFS has been<br>
>> trailing behind that of ldiskfs, but we've made significant performance<br>
>> improvements with Lustre 2.9 and ZFS 0.7.0. Many people use ZFS for the<br>
>> MDT backend because of the checksums and integrated JBOD management, as<br>
>> well as the ability to create snapshots, data compression, etc.<br>
>><br>
>> Cheers, Andreas<br>
>><br>
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