diff options
Diffstat (limited to 'man/man4/zfs.4')
-rw-r--r-- | man/man4/zfs.4 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/man/man4/zfs.4 b/man/man4/zfs.4 index 346e83a9e..9a1dec3e6 100644 --- a/man/man4/zfs.4 +++ b/man/man4/zfs.4 @@ -1068,6 +1068,18 @@ Start syncing out a transaction group if there's at least this much dirty data This should be less than .Sy zfs_vdev_async_write_active_min_dirty_percent . . +.It Sy zfs_wrlog_data_max Ns = Pq int +The upper limit of write-transaction zil log data size in bytes. +Once it is reached, write operation is blocked, until log data is cleared out +after transaction group sync. Because of some overhead, it should be set +at least 2 times the size of +.Sy zfs_dirty_data_max +.No to prevent harming normal write throughput. +It also should be smaller than the size of the slog device if slog is present. +.Pp +Defaults to +.Sy zfs_dirty_data_max*2 +. .It Sy zfs_fallocate_reserve_percent Ns = Ns Sy 110 Ns % Pq uint Since ZFS is a copy-on-write filesystem with snapshots, blocks cannot be preallocated for a file in order to guarantee that later writes will not |