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 |
| spl_kmem_cache_slab_limit | Objects of spl_kmem_cache_slab_limit or smaller will be allocated using the Linux slab allocator, large objects use the SPL allocator. A cut-off of 16K was determined to be optimal for architectures using 4K pages. | 16384 | 16384 |
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.