[lustre-discuss] Mixing ZFS and LDISKFS

[Andreas Dilger]

All of the OSTs and MDTs are "independently managed" (have their own connection state between each client and target) so this should be possible, though I don't know of sites that are doing this.  Possibly this makes sense to put NVMe flash OSTs on ldiskfs, and HDD OSTs on ZFS, and then put them in OST pools so that they are managed separately.

On Jan 12, 2024, at 10:38, Backer <backer.kolo at gmail.com<mailto:backer.kolo at gmail.com>> wrote:

Thank you Andreas! How about mixing OSTs?  The requirement is to do RAID with small volumes using ZFS and have a large OST. This is to reduce the number of OSTs overall as the cluster being extended.

On Fri, 12 Jan 2024 at 11:26, Andreas Dilger <adilger at whamcloud.com<mailto:adilger at whamcloud.com>> wrote:
Yes, some systems use ldiskfs for the MDT (for performance) and ZFS for the OSTs (for low-cost RAID).  The IOPS performance of ZFS is low vs. ldiskfs, but the streaming bandwidth is fine.

Cheers, Andreas

> On Jan 12, 2024, at 08:40, Backer via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> wrote:
>
> 
> Hi,
>
> Could we mix ZFS and LDISKFS together in a cluster?
>
> Thank you,
>
>
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Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Whamcloud







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