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advfs(4)							      advfs(4)

       advfs - A local file system and utilities

       The  Advanced File System (AdvFS), the file system default 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. AdvFS  is licensed with the Tru64  UNIX  operating

       A set of utilities that expands the capabilities of the AdvFS file sys‐
       tem is available as a separately licensed product: The AdvFS Utilities.
       These  utilities	 include  capabilities	such as adding volumes without
       reconfiguring the directory hierarchy of the file system, cloning file‐
       sets  to enable online backup, improving system performance with domain
       balancing, and file striping.  A graphical user	interface  (GUI)  that
       simplifies file system management is available with the utilities.

       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
       provides enhanced local and remote backup utilities (vdump and  rvdump,
       vrestore and rvrestore).

       By  configuring AdvFS as the root file system, the preceding AdvFS fea‐
       tures are extended to the root file  system.   You  can	configure  the
       AdvFS as the root file system during system installation.

       A  UFS  file  system corresponds to a disk partition and is, therefore,
       limited by the size restrictions of that disk. In contrast, AdvFS file‐
       sets can span all volumes in the domain.

   AdvFS File System Concepts
       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  con‐
	      figured with the Logical Storage Manager (LSM).  Domain

	      A	 domain	 is a named set of one or more volumes that provides a
	      shared storage pool for  one  or	more  filesets	(see  filesets

	      When  you	 create	 a  domain  using the mkfdmn command, you must
	      specify a domain name and one initial volume.  The  mkfdmn  com‐
	      mand creates a subdirectory in the /etc/fdmns directory for each
	      new domain. The domain subdirectory contains a symbolic link  to
	      the initial volume.

	      If  you  have AdvFS Utilities, you can add additional volumes to
	      an existing domain by using the addvol utility.  With each added
	      volume,  the  addvol  utility creates a new symbolic link in the
	      appropriate domain subdirectory  of  the	/etc/fdmns  directory.

	      A	 UFS file system has exclusive use of the volume that contains
	      it; an AdvFS fileset can be one of several in a domain  that  is
	      composed of one or more volumes.

	      An  Advanced  File System consists of a domain with at least one
	      fileset that you create using the mkfset command. A fileset is a
	      mountable entity.	 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. Changes to data in files in the original fileset will not
	      appear in the clone. Also, files that you remove from the origi‐
	      nal fileset will remain accessible in the clone under the	 names
	      they had when you created the clone fileset.

   AdvFS Application Programming Interface
       With  the  release  of  Tru64 UNIX Version 5.0, there is an application
       programming interface (API) for AdvFS. Customers can  use  the  API  to
       build  customized  backup and restore capabilities. The API consists of
       several base system functions, which are	 described  in	the  following
       reference  pages:  Create  a read-only copy of an active fileset Get an
       AdvFS domain list Get the AdvFS attributes of a file Obtain a  list  of
       all  the filesets in an AdvFS domain Obtain fileset quotas for an AdvFS
       fileset Remove a fileset or a clone fileset Set AdvFS  file  attributes
       Set fileset quotas for an AdvFS fileset

   AdvFS Commands in the Base System
       The  following  list summarizes the AdvFS commands that are included in
       the base system: Displays file  system  statistics.  See	 advfsstat(8).
       Locates	AdvFS  partitions  on  disks.  See  advscan(8).	  Changes  the
       attributes of a file. See chfile(8).  Changes the attributes of a file‐
       set.   See  chfsets(8).	 Changes  the  attributes  of  a  volume.  See
       chvol(8).  Makes the files in a domain  more  contiguous.  See  defrag‐
       ment(8).	  Edits the user or group quotas.  See edquota(8).  Checks and
       repairs corrupted  AdvFS	 domains.   See	 fixfdmn(8).   Creates	a  new
       domain.	 See  mkfdmn(8).  Creates a fileset within an existing domain.
       See mkfset(8).  Checks for mounted AdvFS	 filesets.  See	 mountlist(8).
       Creates a list of files on specified filesets, including the path names
       and i-numbers.  See ncheck(8).	Displays  formatted  BMT  pages.   See
       nvbmtpg(8).  Displays formatted frag pages.  See nvfragpg(8).  Displays
       formatted log pages.  See nvlogpg(8).  Displays	formatted  tag	pages.
       See  nvtagpg(8).	 Summarizes fileset ownership.	See quot(8).  Displays
       disk usage and limits.  See quota(1).  Checks file system quota consis‐
       tency.  See  quotacheck(8).  Turns off user and group quotas.  See quo‐
       taoff(8).  Turns on user and group quotas.  See quotaon(8).  Renames an
       existing	 fileset.   See	 renamefset(8).	 Summarizes the disk usage and
       quotas for specified filesets.  See  repquota(8).   Removes  an	unused
       domain from AdvFS. See rmfdmn(8).  Deletes a fileset from a domain. See
       rmfset(8).  Recovers file data from damaged AdvFS  domains.   See  sal‐
       vage(8).	  Takes	 a  snapshot  of  an  AdvFS  domain's  metadata.   See
       savemeta(8).  Displays unformatted disk blocks. See shblk(8).  Displays
       frag  file  information.	 See shfragbf(8).  Displays domain attributes.
       See showfdmn(8).	 Displays attributes for AdvFS files. See showfile(8).
       Displays	 information about the filesets in a domain. See showfsets(8).
       Moves the AdvFS log file	 to  a	different  volume  in  a  domain.  See
       switchlog(8).   Prints  the  path name of a file, given the tag number.
       See tag2name(8).	 Displays disk information for AdvFS domains and file‐
       sets.   See  vdf(8).   Backs up filesets. See vdump(8).	Checks for and
       repairs file system inconsistencies. See verify(8).  Displays pages  of
       an AdvFS file. See verify(8).  Restores files from devices written with
       the vdump command. See vrestore(8).  Displays a	page  from  a  storage
       bitmap (SBM) file. See verify(8).

   AdvFS Utilities
       The  AdvFS  Utilities  are  licensed  and purchased separately from the
       Tru64 UNIX operating system. However, the software  and	the  reference
       pages  for  them	 are  installed when you install the base system.  You
       must activate a Product Authorization Key to activate the Advanced File
       System Utilities.

       Also available with the AdvFS Advanced Utilities license is support for
       data management applications through the Data  Management  Applications
       Programming Interface (DMAPI). See the DMAPI manpage for details.

       The following list summarizes the AdvFS Utilities commands: Adds a vol‐
       ume to an existing domain. See addvol(8).  Starts the  AdvFS  graphical
       user  interface	(GUI)  daemon.	 Balances the percentage of used space
       between volumes. See balance(8).	 Creates a read-only copy of  a	 file‐
       set.  See clonefset(8).	Accesses the Data Management Applications Pro‐
       gramming Interface (DMAPI).  See dmapi(3).  Starts the AdvFS  graphical
       user  interface.	  See  dtadvfs(8).   Runs  the Logical Storage Manager
       Storage Administrator (LSMSA).  See lsmsa(8).  Moves the location of  a
       file  within  a	domain.	  See  migrate(8).   Attaches directories to a
       trashcan directory, which stores	 deleted  files.   See	mktrashcan(1).
       Detaches	 a specified directory from a trashcan directory. See mktrash‐
       can(1).	Removes a volume from an existing domain. See rmvol(8).	 Shows
       the  trashcan directory, if any, that is attached to a specified direc‐
       tory. See mktrashcan(1).	 Interleaves  storage  allocation  of  a  file
       across two or more volumes within a domain.  See stripe(8).

       When configuring root on AdvFS, set up one partition and one fileset in
       the domain. Multiple volumes are not supported on root  (except	for  a
       cluster root).

       The  following example creates a domain called accounts_dmn, which con‐
       tains dsk1c as the initial volume.  The example also creates two	 file‐
       sets,  credit_fs	 and  debit_fs,	 creates  mount point directories, and
       mounts both filesets.  # mkfdmn /dev/disk/dsk1c 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

       Commands: mkdir(1), mkfdmn(8), mkfset(8), mount(8), showfdmn(8), showf‐
       sets(8), showfile(8)

       Functions: dmapi(3)

       Files: advfs_err(4), fdmns(4)

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