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System Administration Commands mount_ufs(1M)
NAME
mount_ufs - mount ufs file systems
SYNOPSIS
mount -F ufs [generic_options] [-o specific_options] [-O]
special | mount_point
mount -F ufs [generic_options] [-o specific_options] [-O]
special mount_point
DESCRIPTION
The mount utility attaches a ufs file system to the file
system hierarchy at the mount_point, which is the pathname
of a directory. If mount_point has any contents prior to the
mount operation, these are hidden until the file system is
unmounted.
If mount is invoked with special or mount_point as the only
arguments, mount will search /etc/vfstab to fill in the
missing arguments, including the specific_options. See
mount(1M).
If special and mount_point are specified without any
specific_options, the default is rw.
If the directory on which a file system is to be mounted is
a symbolic link, the file system is mounted on the directory
to which the symbolic link refers, rather than on top of the
symbolic link itself.
OPTIONS
See mount(1M) for the list of supported generic_options.
The following options are supported:
-o specific_options
Specify ufs file system specific options in a comma-
separated list with no intervening spaces. If invalid
options are specified, a warning message is printed and
the invalid options are ignored. The following options
are available:
dfratime | nodfratime
By default, writing access time updates to the disk
may be deferred (dfratime) for the file system until
the disk is accessed for a reason other than updat-
ing access times. nodfratime disables this behavior.
If power management is enabled on the system, do not
set nodfratime unless noatime is also set. If you
SunOS 5.10 Last change: 3 May 2006 1
System Administration Commands mount_ufs(1M)
set nodfratime without setting noatime, the disk is
spun up every time a file within a file system on
the disk is accessed - even if the file is not modi-
fied.
forcedirectio | noforcedirectio
If forcedirectio is specified and supported by the
file system, then for the duration of the mount,
forced direct I/O will be used. If the filesystem is
mounted using forcedirectio, data is transferred
directly between user address space and the disk. If
the filesystem is mounted using noforcedirectio,
data is buffered in kernel address space when data
is transferred between user address space and the
disk. forcedirectio is a performance option that is
of benefit only in large sequential data transfers.
The default behavior is noforcedirectio.
global | noglobal
If global is specified and supported on the file
system, and the system in question is part of a
cluster, the file system will be globally visible on
all nodes of the cluster. If noglobal is specified,
the mount will not be globally visible. The default
behavior is noglobal.
intr | nointr
Allow (do not allow) keyboard interrupts to kill a
process that is waiting for an operation on a locked
file system. The default is intr.
largefiles | nolargefiles
If nolargefiles is specified and supported by the
file system, then for the duration of the mount it
is guaranteed that all regular files in the file
system have a size that will fit in the smallest
object of type off_t supported by the system per-
forming the mount. The mount will fail if there are
any files in the file system not meeting this
SunOS 5.10 Last change: 3 May 2006 2
System Administration Commands mount_ufs(1M)
criterion. If largefiles is specified, there is no
such guarantee. The default behavior is largefiles.
If nolargefiles is specified, mount will fail for
ufs if the file system to be mounted has contained a
large file (a file whose size is greater than or
equal to 2 Gbyte) since the last invocation of fsck
on the file system. The large file need not be
present in the file system at the time of the mount
for the mount to fail; it could have been created
previously and destroyed. Invoking fsck (see
fsck_ufs(1M)) on the file system will reset the file
system state if no large files are present. After
invoking fsck, a successful mount of the file system
with nolargefiles specified indicates the absence of
large files in the file system; an unsuccessful
mount attempt indicates the presence of at least one
large file.
logging | nologging
If logging is specified, then logging is enabled for
the duration of the mounted file system. Logging is
the process of storing transactions (changes that
make up a complete UFS operation) in a log before
the transactions are applied to the file system.
Once a transaction is stored, the transaction can be
applied to the file system later. This prevents
file systems from becoming inconsistent, therefore
reducing the possibility that fsck might run. And,
if fsck is bypassed, logging generally reduces the
time required to reboot a system.
The default behavior is logging for all UFS file
systems.
The log is allocated from free blocks in the file
system, and is sized approximately 1 Mbyte per 1
Gbyte of file system, up to a maximum of 64 Mbytes.
Logging is enabled on any UFS file system, including
root (/), except under the following conditions:
o When logging is specifically disabled.
o If there is insufficient file system space for
the log. In this case, the following message is
displayed and file system is still mounted:
SunOS 5.10 Last change: 3 May 2006 3
System Administration Commands mount_ufs(1M)
# mount /dev/dsk/c0t4d0s0 /mnt
/mnt: No space left on device
Could not enable logging for /mnt on /dev/dsk/c0t4d0s0.
The log created by UFS logging is continually
flushed as it fills up. The log is totally flushed
when the file system is unmounted or as a result of
the lockfs -f command.
m
Mount the file system without making an entry in
/etc/mnttab.
noatime
By default, the file system is mounted with normal
access time (atime) recording. If noatime is speci-
fied, the file system will ignore access time
updates on files, except when they coincide with
updates to the ctime or mtime. See stat(2). This
option reduces disk activity on file systems where
access times are unimportant (for example, a Usenet
news spool).
noatime turns off access time recording regardless
of dfratime or nodfratime.
The POSIX standard requires that access times be
marked on files. -noatime ignores them unless the
file is also modified.
onerror = action
This option specifies the action that UFS should
take to recover from an internal inconsistency on a
file system. Specify action as panic, lock, or
umount. These values cause a forced system shutdown,
a file system lock to be applied to the file system,
or the file system to be forcibly unmounted, respec-
tively. The default is panic.
quota
SunOS 5.10 Last change: 3 May 2006 4
System Administration Commands mount_ufs(1M)
Quotas are turned on for the file system.
remount
Remounts a file system with a new set of options.
All options not explicitly set with remount revert
to their default values.
rq
Read-write with quotas turned on. Equivalent to rw,
quota.
-O
Overlay mount. Allow the file system to be mounted over
an existing mount point, making the underlying file sys-
tem inaccessible. If a mount is attempted on a pre-
existing mount point without setting this flag, the
mount will fail, producing the error "device busy".
EXAMPLES
Example 1: Turning Off (and On) Logging
The following command turns off logging on an already
mounted file system. The subsequent command restores log-
ging.
# mount -F ufs -o remount,nologging /export
# (absence of message indicates success)
# mount -F ufs -o remount,logging /export
In the preceding commands, the -F ufs option is not neces-
sary.
FILES
/etc/mnttab table of mounted file systems
SunOS 5.10 Last change: 3 May 2006 5
System Administration Commands mount_ufs(1M)
/etc/vfstab list of default parameters for each file
system
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
fsck(1M), fsck_ufs(1M), mount(1M), mountall(1M), fcntl(2),
mount(2), stat(2), mnttab(4), vfstab(4), attributes(5),
fsattr(5), largefile(5)
NOTES
Since the root (/) file system is mounted read-only by the
kernel during the boot process, only the remount option (and
options that can be used in conjunction with remount) affect
the root (/) entry in the /etc/vfstab file.
SunOS 5.10 Last change: 3 May 2006 6
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This page was generated on Wed Sep 12 11:26:17 GMT 2007
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