ZFS Tunables for Lustre Metadata Servers (MDS)

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Parameter Notes Default Suggested
zfs_arc_max Maximum size of the ARC. 50% RAM 75% RAM
zfs_arc_meta_limit Increasing this value will improve performance if the workload involves operations on a large number of files and directories, or frequent metadata operations, at the cost of less file data fitting in the ARC. 25% ARC 75% ARC
zfs_vdev_scheduler VDEV scheduler noop Deadline
metaslab_debug_unload This option prevents ZFS from unloading the spacemaps from a metaslab once it is read in. 0 1

For a comprehensive description of all available ZFS and SPL module parameters, refer to the zfs-module-parameters(5) and spl-module-parameters(5) man pages.