[lustre-discuss] Lustre and ZFS ZIL

[Andreas Dilger]

As the links say, Lustre cannot use ZFS ZIL because the ZIL is used up at the "filesystem" layer (ZPL), but Lustre interfaces to ZFS at a lower layer (DMU).  Lustre *can* work with L2ARC to *cache* data from the HDDs.  You could also use a "special flash VDEV" (Metadata Allocation Class) to store ZFS metadata/small blocks on flash, and only store larger data blocks on HDD.

Cheers, Andreas

On Sep 23, 2022, at 06:26, Taner KARAGÖL via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> wrote:

UNCLASSIFIED

Hi folks,

I wonder how ZFS ZIL increases my performance. Our lustre OST underlying FS is ZFS and all disks are HDDs. I am planing to add NVMe ZIL device.
Our Lustre version is 2.12

Some links says Lustre does not support ZIL. What does it mean by “support”? Cant ZFS use ZIL with Lustre?

Best Regards,

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Whamcloud







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