svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
tunefs(8)
System Administration Commands tunefs(8)
NAME
tunefs - tune an existing UFS file system
SYNOPSIS
tunefs [-a maxcontig] [-d rotdelay] [-e maxbpg]
[-m minfree] [-o space | time] special | filesystem
DESCRIPTION
tunefs is designed to change the dynamic parameters of a file system
that affect the layout policies. When using tunefs with filesystem,
filesystem must be in /etc/vfstab. The parameters that can be changed
are indicated by the options given below.
OPTIONS
The following options are supported:
-a maxcontig The maximum number of logical blocks, belonging to
one file, that is allocated contiguously. The
default is calculated as follows:
maxcontig = disk drive maximum transfer size / disk block size
If the disk drive's maximum transfer size cannot be
determined, the default value for maxcontig is cal‐
culated from kernel parameters as follows:
If maxphys is less than ufs_maxmaxphys, which is 1
Mbyte, then maxcontig is set to maxphys. Otherwise,
maxcontig is set to ufs_maxmaxphys.
You can set maxcontig to any positive integer
value.
The actual value will be the lesser of what has
been specified and what the hardware supports.
-d rotdelay This parameter is obsolete as of the Solaris 10
release. The value is always set to 0, regardless
of the input value.
-e maxbpg Indicates the maximum number of contiguous logical
blocks any single file can allocate from a cylinder
group before it is forced to begin allocating
blocks from another cylinder group. Typically this
value is set to approximately one quarter of the
total contiguous logical blocks in a cylinder
group. The intent is to prevent any single file
from using up all the blocks in a single cylinder
group, thus degrading access times for all files
subsequently allocated in that cylinder group.
The effect of this limit is to cause big files to
do long seeks more frequently than if they were
allowed to allocate all the blocks in a cylinder
group before seeking elsewhere. For file systems
with exclusively large files, this parameter should
be set higher.
-m minfree Specifies the minimum free space threshold, or the
percentage of space held back from normal users.
This value can be set to 0. However, up to a factor
of three in throughput will be lost over the per‐
formance obtained at a 10% threshold. Note: If the
value is raised above the current usage level,
users will be unable to allocate files until enough
files have been deleted to get under the higher
threshold.
-ospace|time The file system can either be instructed to try to
minimize the time spent allocating blocks, or to
try to minimize the space fragmentation on the
disk. The default is time.
Generally, you should optimize for time unless the
file system is over 90% full.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/file-system/ufs
SEE ALSO
attributes(7), mkfs_ufs(8), newfs(8)
NOTES
You can tune a file-system, but you can't tune a fish.
Oracle Solaris 11.4 4 Feb 2015 tunefs(8)