diff options
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 7 | ||||
| -rw-r--r-- | module/zfs/vdev_queue.c | 2 |
2 files changed, 7 insertions, 2 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index 72ff0686c..ec07cda76 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -1052,7 +1052,12 @@ Default value: \fB10\fR. Minimum asynchronous write I/Os active to each device. See the section "ZFS I/O SCHEDULER". .sp -Default value: \fB1\fR. +Lower values are associated with better latency on rotational media but poorer +resilver performance. The default value of 2 was chosen as a compromise. A +value of 3 has been shown to improve resilver performance further at a cost of +further increasing latency. +.sp +Default value: \fB2\fR. .RE .sp diff --git a/module/zfs/vdev_queue.c b/module/zfs/vdev_queue.c index d969cfeed..2439f2951 100644 --- a/module/zfs/vdev_queue.c +++ b/module/zfs/vdev_queue.c @@ -148,7 +148,7 @@ uint32_t zfs_vdev_sync_write_min_active = 10; uint32_t zfs_vdev_sync_write_max_active = 10; uint32_t zfs_vdev_async_read_min_active = 1; uint32_t zfs_vdev_async_read_max_active = 3; -uint32_t zfs_vdev_async_write_min_active = 1; +uint32_t zfs_vdev_async_write_min_active = 2; uint32_t zfs_vdev_async_write_max_active = 10; uint32_t zfs_vdev_scrub_min_active = 1; uint32_t zfs_vdev_scrub_max_active = 2; |