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mount_ufs(8)
System Administration Commands mount_ufs(8)
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 hierar‐
chy 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.
The ufs file system supports direct mounting of files containing the
file system as well as block devices. See mount(8) and lofiadm(8).
If mount is invoked with special or mount_point as the only arguments,
mount will search /etc/vfstab to fill in the missing arguments, includ‐
ing the specific_options. See mount(8).
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(8) 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 updating access times. nod‐
fratime disables this behavior.
If power management is enabled on the system, do not set nod‐
fratime unless noatime is also set. If you set nodfratime with‐
out 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 modified.
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 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(8)) 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 dura‐
tion of the mounted file system. Logging is the process of
storing transactions (changes that make up a complete UFS oper‐
ation) 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 gener‐
ally 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 256 Mbytes. The log size may be larger (up to a
maximum of 512 Mbytes) dependent upon the number of cylinder
groups present in the file system.
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 dis‐
played and file system is still mounted:
# 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 specified, 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.
nosec
By default, Access Control Lists (ACLs) are supported on a
mounted UFS file system. Use this option to disallow the set‐
ting or any modification of an ACL on a file within a mounted
UFS file system.
onerror = action
This option specifies the action that UFS should take to
recover from an internal inconsistency on a file system. Spec‐
ify 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,
respectively. The default is panic.
quota
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.
xattr | noxattr
Allow or disallow the creation and manipulation of extended
attributes. The default is xattr. See fsattr(7) for a description
of extended attributes.
-O
Overlay mount. Allow the file system to be mounted over an existing
mount point, making the underlying file system 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 sys‐
tem. The subsequent command restores logging.
# 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 necessary.
FILES
/etc/mnttab
table of mounted file systems
/etc/vfstab
list of default parameters for each file system
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
fcntl(2), mount(2), stat(2), mnttab(5), vfstab(5), attributes(7),
fsattr(7), fsck(8), fsck_ufs(8), lofiadm(8), mount(8), mountall(8)
NOTES
Since the root (/) file system is mounted read-only by the kernel dur‐
ing 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.
Oracle Solaris 11.4 4 Feb 2015 mount_ufs(8)