[lustre-discuss] Quick ZFS pool question?

Xiong, Jinshan jinshan.xiong at intel.com
Thu Oct 6 23:16:54 PDT 2016

> On Oct 6, 2016, at 2:04 AM, Phill Harvey-Smith <p.harvey-smith at warwick.ac.uk> wrote:
> Hi all,
> Having tested a simple setup for lustre / zfs, I'd like to trey 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.


> Cheers.
> Phill.
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