[lustre-discuss] hsm_restore

Mark Roper markroper at gmail.com
Tue Nov 13 09:56:59 PST 2018

Lustre Community,

I have a Lustre file system running 2.10.5 using ZFS 0.7.9 as the OST and
MDT file system.  Executing hsm_restore on hundreds of 2 byte files is
causing ~120 MDT writes per second per file. This is with default ZFS
configuration values.

The same hsm_restore on a similarly configured file system using LDISKFS
induces less than 1 write operation per file (presumably because of
batching). As with ZFS, this is using default LDISKFS settings.

Has anyone done ZFS performance tuning or analysis of MDT IOPS with

Many thanks!

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