diff options
Diffstat (limited to 'sbin/tunefs/tunefs.8')
| -rw-r--r-- | sbin/tunefs/tunefs.8 | 41 |
1 files changed, 17 insertions, 24 deletions
diff --git a/sbin/tunefs/tunefs.8 b/sbin/tunefs/tunefs.8 index 3480397..424e209 100644 --- a/sbin/tunefs/tunefs.8 +++ b/sbin/tunefs/tunefs.8 @@ -32,7 +32,7 @@ .\" @(#)tunefs.8 8.2 (Berkeley) 12/11/93 .\" $FreeBSD$ .\" -.Dd December 11, 1993 +.Dd May 18, 2002 .Dt TUNEFS 8 .Os .Sh NAME @@ -42,7 +42,6 @@ .Nm .Op Fl A .Op Fl a Ar maxcontig -.Op Fl d Ar rotdelay .Op Fl e Ar maxbpg .Op Fl f Ar avgfilesize .Op Fl m Ar minfree @@ -57,6 +56,13 @@ .Nm Tunefs is designed to change the dynamic parameters of a filesystem which affect the layout policies. +The +.Nm +program cannot be run on an active filesystem. +To change an active filesystem, +you must either downgrade the filesystem to read-only +or unmount it. +.Pp The parameters which are to be changed are indicated by the flags given below: .Bl -tag -width indent @@ -66,19 +72,8 @@ this option will cause all backups to be modified as well as the primary super-block. This is potentially dangerous - use with caution. .It Fl a Ar maxcontig Specify the maximum number of contiguous blocks that will -be laid out before forcing a rotational delay (see -.Fl d -below). -The default value is one, since most device drivers require -an interrupt per disk transfer. -Device drivers that can chain several buffers together in a single -transfer should set this to the maximum chain length. -.It Fl d Ar rotdelay -Specify the expected time (in milliseconds) -to service a transfer completion -interrupt and initiate a new transfer on the same disk. -It is used to decide how much rotational spacing to place between -successive blocks in a file. +be laid out before allowing a rotational delay. +The default value is 16. .It Fl e Ar maxbpg Indicate the maximum number of blocks any single file can allocate out of a cylinder group before it is forced to begin @@ -131,9 +126,11 @@ the percent fragmentation changes on the filesystem. .It Fl p Show a summary of what the current tunable settings are on the selected filesystem. More detailed information can be -obtained in the +obtained from the .Xr dumpfs 8 -manual page. +or +.Xr ffsinfo 8 +programs. .It Fl s Ar avgfpdir Specify the expected number of files per directory. .El @@ -148,6 +145,7 @@ specified mount point. .Sh SEE ALSO .Xr fs 5 , .Xr dumpfs 8 , +.Xr ffsinfo 8 , .Xr newfs 8 .Rs .%A M. McKusick @@ -162,13 +160,8 @@ specified mount point. .%O "(reprinted in the BSD System Manager's Manual, SMM:5)" .Re .Sh BUGS -This program should work on mounted and active filesystems. -Because the super-block is not kept in the buffer cache, -the changes will only take effect if the program -is run on dismounted filesystems. -To change the root filesystem, the system must be rebooted -after the filesystem is tuned. -.\" Take this out and a Unix Demon will dog your steps from now until +This program should work on active filesystems. +.\" Take this out and a Unix Daemon will dog your steps from now until .\" the time_t's wrap around. .Pp You can tune a filesystem, but you can't tune a fish. |
