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added when-to-use case for l2arc_noprefetch

Richard Elling 2019-11-27 13:56:58 -08:00
parent 7a59c91d17
commit 1917d4ad47
1 changed files with 1 additions and 1 deletions
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ZFS-on-Linux-Module-Parameters.md

@ -695,7 +695,7 @@ Disables writing prefetched, but unused, buffers to cache devices.
| l2arc_noprefetch | Notes
|---|---
| Tags | [ARC](#arc), [L2ARC](#l2arc), [prefetch](#prefetch)
| When to change | Setting to 0 can increase L2ARC hit rates for workloads where the ARC is too small for a read workload that benefits from prefetching.
| When to change | Setting to 0 can increase L2ARC hit rates for workloads where the ARC is too small for a read workload that benefits from prefetching. Also, if the main pool devices are very slow, setting to 0 can improve some workloads such as backups.
| Data Type | boolean
| Range | 0=write prefetched but unused buffers to cache devices, 1=do not write prefetched but unused buffers to cache devices
| Default | 1