diff options
Diffstat (limited to 'mount/mount.8')
| -rw-r--r-- | mount/mount.8 | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/mount/mount.8 b/mount/mount.8 index e766d353..bb807167 100644 --- a/mount/mount.8 +++ b/mount/mount.8 @@ -1277,7 +1277,11 @@ in files after a crash and journal recovery. .TP .BR barrier=0 " / " barrier=1 " This enables/disables barriers. barrier=0 disables it, barrier=1 enables it. -The ext3 filesystem does not enable write barriers by default. +Write barriers enforce proper on-disk ordering of journal commits, making +volatile disk write caches safe to use, at some performance penalty. The ext3 +filesystem does not enable write barriers by default. Be sure to enable +barriers unless your disks are battery-backed one way or another. Otherwise +you risk filesystem corruption in case of power failure. .TP .BI commit= nrsec Sync all data and metadata every @@ -1942,6 +1946,15 @@ manual page. Enable POSIX Access Control Lists. See the .BR acl (5) manual page. +.TP +.BR barrier=none " / " barrier=flush " +This enables/disables the use of write barriers in the journaling code. +barrier=none disables it, barrier=flush enables it. Write barriers enforce +proper on-disk ordering of journal commits, making volatile disk write caches +safe to use, at some performance penalty. The reiserfs filesystem does not +enable write barriers by default. Be sure to enable barriers unless your disks +are battery-backed one way or another. Otherwise you risk filesystem +corruption in case of power failure. .SH "Mount options for romfs" None. |