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advfs(4)
NAME
advfs - A local file system and utilities
DESCRIPTION
The File System (AdvFS), a file system option on the Tru64 UNIX operating
system, features rapid crash recovery, high performance, and a flexible
structure that enables you to manage your file system while it is on line.
The AdvFS component is licensed with the Tru64 UNIX operating system and is
available as file system option during installation.
A set of utilities that expands the capabilities of the AdvFS file system
is available: The Advanced File System Utilities. These utilities include
capabilities such as adding volumes without reconfiguring the directory
hierarchy of the file system, cloning filesets to enable online backup, and
improving system performance with domain balancing, and file striping.
Additionally, a graphical user interface (GUI) that simplifies file system
management is available with the utilities. The Advanced File System Utili-
ties component is licensed separately from the Tru64 UNIX operating system.
Using journaling techniques, AdvFS provides faster crash recovery than the
UNIX file system (UFS), which implements crash recovery using the fsck
utility.
In addition to fast restarts, AdvFS ensures that file structures are
recovered consistently; extends file and fileset sizes to greater than 2
gigabytes; creates, deletes, and renames files faster than UFS; and pro-
vides enhanced backup utilities (vdump and vrestore).
By configuring AdvFS as the root filesystem, the preceding AdvFS features
are extended to the root filesystem.
A UFS file system corresponds to a disk partition and is, therefore, lim-
ited by the size restrictions of that disk. In contrast, AdvFS filesets can
span all volumes in the file domain.
AdvFS introduces file system concepts that do not exist for UFS. Under-
standing the following concepts prepares you for planning, creating, and
maintaining the AdvFS file system:
+ Volumes
A volume is any mechanism that behaves like a UNIX block device, such
as a disk, disk partition, or logical volume that is configured with
the Logical Storage Manager (LSM).
+ File Domain
A file domain is a named set of one or more volumes that provides a
shared storage pool for one or more filesets (see filesets below).
When you create a file domain using the mkfdmn command, you must
specify a domain name and one initial volume. The mkfdmn command
creates a subdirectory in the /etc/fdmns directory for each new file
domain. The file-domain subdirectory contains a symbolic link to the
initial volume.
You can add additional volumes to an existing file domain by using the
addvol utility. With each added volume, the addvol utility creates a
new symbolic link in the appropriate file-domain subdirectory of the
fdmns directory.
+ Filesets
A fileset is both the logical file structure that the user recognizes
and a unit that you can mount. Whereas you typically mount an entire
UNIX file system, with the AdvFS you mount the individual filesets of
a file domain.
An Advanced File System consists of a file domain with at least one
fileset that you create using the mkfset command. For each fileset,
the mkfset command creates a .tags directory. The .tags directory is a
permanent directory that is reserved for future use. You cannot
delete, rename, or add any files to the .tags directory.
+ Clone Fileset
A clone fileset is a read-only copy of an existing fileset, which you
can mount as you do other filesets. You create a clone fileset by
using the clonefset utility. The reason you create and mount a clone
fileset is to perform an online backup of the existing fileset.
A clone fileset is a snapshot of the original fileset, capturing and
fixing the original fileset at a moment in time. Any changes you make
to the original fileset will not appear in its clone. For instance,
new files added to the original fileset will not appear in the clone.
Changes to data in files in the original fileset will not appear in
the clone. Also, files that you remove from the original fileset will
remain accessible in the clone under the names they had when you
created the clone fileset.
The following list summarizes the AdvFS commands:
advfsstat
Displays file system statistics. See advfsstat( .
advscan
Locates AdvFS partitions on disks. See advscan(.
chfile
Changes the attributes of a file. See chfile(.
chfsets
Changes the attributes of a fileset. See chfsets(.
chvol
Changes the attributes of a volume. See chvol(.
defragment
Makes the files in a file domain more contiguous. See defragment(.
edquota
Edits the user or group quotas. See edquota(.
mkfdmn
Creates a new file domain. See mkfdmn(.
mkfset
Creates a fileset within an existing file domain. See mkfset(.
mountlist
Checks for mounted AdvFS filesets. See mountlist(.
ncheck
Creates a list of files on specified filesets, including the path names
and i-numbers. See ncheck(8).
quot
Summarizes fileset ownership. See quot(8).
quota
Displays disk usage and limits. See quota(1).
quotacheck
Checks file system quota consistency. See quotacheck(8).
quotaon
Turns on user and group quotas. See quotaon(8).
quotaoff
Turns off user and group quotas. See quotaoff(8).
renamefset
Renames an existing fileset. See renamefset(8).
repquota
Summarizes the disk usage and quotas for specified filesets. See
repquota(8).
rmfdmn
Removes an unused file domain from AdvFS. See rmfdmn(8).
rmfset
Deletes a fileset from a file domain. See rmfset(8).
shblk
Displays unformatted disk blocks. See shblk(8).
shfragbf
Displays frag file information. See shfragbf(8).
showfdmn
Displays domain attributes. See showfdmn(8).
showfile
Displays attributes for files in an Advanced File System. See
showfile(8).
showfsets
Displays information about the filesets in a domain. See showfsets(8).
switchlog
Moves the AdvFS log file to a different volume in a file domain. See
switchlog(8).
tag2name
Prints the path name of a file, given the tag number. See tag2name(8).
vbmtchain
Displays mcells that describe metadata for a file. See vbmtchain(8).
vbmtpg
Displays a formatted page of the bitfile metadata table (BMT). See
vbmtpg(8).
vdump
Backs up filesets. See vdump(8).
verify
Checks for and repairs file system inconsistencies. See verify(8).
vfile
Displays the contents of a file from an unmounted domain. See
vfile(8).
vfragpg
Prints a single header page of a frag file. See vfragpg(8).
vlogpg
Displays a formatted page of the log. See vlogpg(8).
vlsnpg
Displays the logical sequence number (LSN) of a page of the log. See
vlsnpg(8).
vrestore
Restores files from devices written with the vdump command. See vre-
store(8).
vtagpg
Displays a formatted page of the tag directory. See vtagpg(8).
Note
Operations supported by the following AdvFS commands will be retired
in a future release of the Tru64 UNIX operating system and are sup-
ported only for backward compatibility with operating system ver-
sions earlier than DIGITAL UNIX Version 4.0: vedquota(8),
vncheck(8), vquot(8), vquota(1), vquotaon(8), vquotaoff(8), and
vrepquota(8). The operations supported by these retiring commands
are also supported by the following commands: edquota(8), ncheck(8),
quot(8), quota(1), quotaon(8), quotaoff(8), and repquota(8).
The Advanced File System Utilities are licensed separately from the Tru64
UNIX operating system and must be purchased separately. Both the software
and the reference pages are contained in the separately-licensed product,
and must be installed before being used. The following list summarizes the
Advanced File System Utilities commands:
addvol
Adds a volume to an existing file domain. See addvol(8).
advfsd
Starts the AdvFS graphical user interface (GUI) daemon.
balance
Balances the percentage of used space between volumes. See balance(8).
clonefset
Creates a read-only copy of a fileset. See clonefset(8).
dtadvfs
Starts the AdvFS graphical user interface. See dtadvfs(8).
migrate
Moves the location of a file within a file domain. See migrate(8).
mktrashcan
Attaches directories to a trashcan directory, which stores deleted
files. See mktrashcan(8).
rmtrashcan
Detaches a specified directory from a trashcan directory. See
mktrashcan(8).
rmvol
Removes a volume from an existing file domain. See rmvol(8).
shtrashcan
Shows the trashcan directory, if any, that is attached to a specified
directory. See mktrashcan(8).
stripe
Interleaves storage allocation of a file across two or more volumes
within a file domain. See stripe(8).
RESTRICTIONS
When configuring root on AdvFS, set up one partition and one fileset in the
file domain. Multiple volumes are not supported on root.
EXAMPLES
The following example creates a file domain called accounts_dmn, which con-
tains rz1c as the initial volume. The example also creates two filesets,
credit_fs and debit_fs and mounts both filesets.
# mkfdmn /dev/rz1c accounts_dmn
# mkfset accounts_dmn credit_fs
# mkfset accounts_dmn debit_fs
# mkdir /mnt/credit /mnt/debit
# mount -t advfs accounts_dmn#credit_fs /mnt/credit
# mount -t advfs accounts_dmn#debit_fs /mnt/debit
SEE ALSO
advfs_err(4), fdmns(4), mkfdmn(8), mkfset(8), mkdir(1), mount(8) |
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发表于 2004-08-19 15:48
