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vxdump(1M)							    vxdump(1M)

NAME
       vxdump,	rvxdump	 -  incremental VxFS file system dump, local or across
       network

SYNOPSIS
       blocksize] records] density] filename] size] time] tracks] filesystem

       blocksize] records] density] filename] size] time] filesystem

       option [argument]...  filesystem

       option [argument]...  filesystem

DESCRIPTION
       copies to magnetic tape all files in  the  filesystem  that  have  been
       changed	after  a  certain  date.  This information is derived from the
       files and a timestamp file, by default copies the files to a tape drive
       on  a  remote  system.  runs a process, on the remote machine to access
       the tape device.

       and support both and traditional	 command  line	invocations  as	 shown
       above.	The original command line style is supported for compatibility
       with previous versions of and for synonymy with	the  existing  program
       used  for  hfs  file  systems.  For the traditional command line style,
       option consists of characters from  the	set  without  any  intervening
       white space.

       On  most	 devices  detects  end-of-media	 and prompts you to change the
       media if there is insufficient space, so it is not necessary to specify
       the  size  of  the  device.  However, if the dump will require multiple
       tapes and the tapes are to be read using an older version of or if  the
       tape  device handles end-of-media in a way that doesn't recognize, then
       you must specify the size of the device using the option or a  combina‐
       tion of the options.

   Options
       If  no arguments are given, the options are assumed to be and a default
       file system is dumped to the default tape.

       recognizes the following options:

	      number	is a single digit in the range [0-9] and indicates the
			dump  level.   All  files modified since the last date
			stored in the timestamp file for the same file	system
			at  a  lesser  dump  level  will be dumped.  Thus, the
			option dumps the entire file system.  If  no  date  is
			determined  by the level, the beginning of (UNIX) time
			is assumed.

	      The number of logical records per volume.
			The logical record size is 1024	 bytes.	  records  can
			also  be specified with a suffix to indicate a unit of
			measure other than 1024 bytes.	You can append a or to
			the number to indicate that the value is in kilobytes,
			megabytes, or gigabytes,  respectively.	  This	option
			overrides the calculation of tape size based on length
			and density.

	      The blocking factor is taken from the
			blocksize option argument.  (default is 63 if  is  not
			specified).   Block  size  is  defined	as the logical
			record size times the blocking factor.	writes logical
			records	 of  1024  bytes.   Older  versions  of used a
			blocking factor of 10 for tapes	 with  densities  less
			than 6250 BPI, and 32 for tapes with densities of 6250
			BPI or greater.	 dynamically determines	 the  blocking
			factor.

	      Cartridge.
			Specifies  using  a  cartridge instead of the standard
			half-inch reel.	 This sets the density to 1000 BPI and
			the  blocking  factor to 63.  The length is set to 425
			feet.  -c is incompatible with the -d  option,	unless
			you specify a density of 1000 BPI with that option.

	      The density of the tape (expressed in BPI)
			used  to  calculate  the  amount of tape used per tape
			reel.  If is specified, a  default  density  value  of
			1600 is assumed for a reel tape.

	      Place the dump on the file
			filename instead of the tape.  If the name of the file
			is writes to the standard output.  This option can  be
			of  the	 form  to  specify  a  tape device on a remote
			machine.

	      Whenever	requires operator attention, notify all users in group
			by means similar to that described by wall(1M).

	      Use	rather than for timestamp information.

	      size	is the size of the dump tape, specified in feet.  When
			the specified size is reached, waits for reels	to  be
			changed.   If  is  specified,  a default size value of
			2300 is assumed for a reel tape.

	      -t tracks Specifies the number of tracks for a  cartridge	 tape.
			The default is nine tracks.  -t is not compatible with
			the -d option.

	      Use the specified date as the starting time for the dump
			instead of the time determined	from  looking  in  the
			timestamp  file.   The	format	of date is the same as
			that of This  option  is  useful  for  automated  dump
			scripts	 that  wish  to dump over a specific period of
			time.

			·  You can specify only for incremental	 dumps;	 using
			   for a level 0 dump returns an error.

			·  is mutually exclusive with the option.

			·  If  you enter an improperly formatted date, returns
			   an error message and terminates the dump.

	      If the dump completes successfully,
			write in the timestamp file the	 date  when  the  dump
			started.   This	 file records a separate date for each
			file system and each dump level.  The  format  of  the
			timestamp  file	 is  user-readable and consists of one
			free-format record per line: file system name,	incre‐
			ment  level  and  dump	date in format.	 The timestamp
			file can be edited to change any of the fields if nec‐
			essary.	 The option is ignored for partial dumps.

	      For each file system in the timestamp file
			print  the most recent dump date and level, indicating
			which file systems should be dumped.  If is specified,
			all other options are ignored and exits immediately.

	      Operate like
			but print only file systems that need to be dumped.

   Operands
       recognizes the following operand:

	      filename	Name  of the file that contains a list of all files in
			the to be copied to magnetic tape.

   Operator Interaction
       requires operator intervention for any of the following conditions:

	      ·	 end of tape
	      ·	 end of dump
	      ·	 tape-write error
	      ·	 tape-open error
	      ·	 disk-read error (if errors exceed threshold of 32).

       In addition to alerting all operators implied by the option,  interacts
       with  the  control  terminal  operator by posing questions requiring or
       answers when it can no longer proceed or if there is a serious problem.

       Because making a full dump typically requires considerable time, estab‐
       lishes a checkpoint at the start of each tape volume.  If, for any rea‐
       son, writing that volume fails, with operator permission, restarts from
       the checkpoint after the old tape is rewound and removed and a new tape
       is mounted.

       periodically reports information to the operator,  including  estimates
       (typically  low)	 of the number of blocks to write, the number of tapes
       it requires, time required to complete, and the	time  remaining	 until
       tape change.  The output is verbose to inform other users that the ter‐
       minal controlling is busy and will be for some time.

   Compatibility
       The dump tape format is independent of the VxFS disk layout.  A dump of
       a  file system with the Version 4 disk layout can be restored on a file
       system using the Version 2 disk layout or even a file system of another
       file system type, with the following exceptions:

       ·  Files	 larger than 2 GB cannot be restored by earlier versions of If
	  a file larger than 2 GB is encountered, an older skips the file  and
	  returns this message:

       ·  Files larger than 2 GB cannot be restored on a file system that does
	  not support large files (see mount_vxfs(1M)).

       ·  A file with a large uid (user ID of the file	owner)	or  large  gid
	  (group  ID of the file owner) cannot be restored correctly on a file
	  system that does not support large IDs.  Instead, the	 owner	and/or
	  group of the file will be that of the user invoking (A large ID is a
	  value greater than 65535.  The VxFS Version 2 disk layout  does  not
	  support large IDs).

       ·  Files	 with  VxFS  extent  attributes	 (see  setext(1M))  cannot  be
	  restored on a file system of a type that  does  not  support	extent
	  attributes.

       If  you use to produce a dump intended for an earlier version of and if
       the dump requires multiple tapes, you should use the or option.

       Dumps produced by older versions of can be read by the current  version
       of

   Notes
       Perform	dumps  with the file system unmounted or the system in single-
       user environment (see init(1M)) to ensure a consistent  dump.   If  you
       have  the  HP OnLineJFS product installed, the dump can be performed in
       the multi-user environment using a snapshot file system with the online
       backup facility (see the option of mount_vxfs(1M)).

       Up to 32 read errors on the file system are ignored.

       Each  reel  requires  a new process; parent processes for reels already
       written remain until the entire tape is written.

       does not dump information about ACLs, therefore does not restore infor‐
       mation about ACLs.

       Neither nor work with Storage Checkpoints.

       A  version  of  resides	in  for	 use when the system is in single user
       state.

EXAMPLES
       In the following example, assume	 that  the  file  system  is  normally
       attached to the file tree at the root directory,

       In  this	 example,  the entire file system is dumped on and the size of
       the tape is 2 gigabytes.

       Using the traditional command line syntax and specifying the tape  size
       in logical records:

       The  option  argument  goes  with  the option letter as it is the first
       option letter that requires an option argument.	 The  option  argument
       goes  with  the	option	letter	as it is the second option letter that
       requires an option argument.

AUTHOR
       and are based on the and programs from the 4.4 Berkeley	Software  Dis‐
       tribution, developed by the the University of California, Berkeley, and
       its contributors.

FILES
       Default legacy DSF tape unit to dump to.
       Default persistent DSF tape unit to dump to.
       New format-dump-date record.  This is the default file for VxFS.
       New format-dump-date record.  Can be substituted for by using  the  /CR
				     -o option.
       Dump table: file systems and frequency.
       Mounted file system table.
       Used to find group

SEE ALSO
       dump(1M),  init(1M),  mount(1M),	 mount_vxfs(1M),  rmt(1M), setext(1M),
       vxrestore(1M),  wall(1M),  close(2),  open(2),  ctime(3C),  getopt(3C),
       fstab(4), mnttab(4).

								    vxdump(1M)
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