Norbert Gruener > AFS > AFS::VOS

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NAME ^

AFS::VOS - Class to communicate with the AFS Volume Server

SYNOPSIS ^

  use AFS::VOS;

  my $vos = AFS::VOS->new(1, 120, 1);

  my $ok = $vos->backup('volume');
  $vos->DESTROY;

  $vos = AFS::VOS->new;

  $ok = $vos->dump('volume', 0, 'dump.vol', '', '', 1, 1);
  $ok = $vos->dump('volume', 0, 'dump.vol');
  $ok = $vos->restore('serv1', '/vicepa', 'volume', 'dump.vol', 0, 1);

  my $volid = $vos->create('serv1', '/vicepa', 'volume');
  $volid = $vos->move('volume', 'serv1', 'vicepa', 'serv2', 'vicepb');
  $volid = $vos->remove('serv1', '/vicepa', 'volume');

  $ok = $vos->offline('serv1', '/vicepa', 'volume');
  $ok = $vos->online('serv1', '/vicepa', 'volume');

  $ok = $vos->release('volume');
  my $stat = $vos->status('serv1', '/vicepa');
  print "Status is: $stat\n";

  $ok = $vos->rename('oldvol', 'newvol');

  $ok = $vos->setquota('volume', 6500, 1);

  $volid = $vos->zap('serv1', '/vicepa', 'volume');

  my ($tBack, $tFail) = $vos->backupsys('home', 'serv', '/vicepc');
  ($tBack, $tFail) = $vos->backupsys(['home', 'data'], 'serv', '/vicepc');

  my @parts = $vos->listpart('serv1');

  my $vols = $vos->listvol('serv1', '/vicepa');

  my $partinfo = $vos->partinfo('volume');

DESCRIPTION ^

This class is used to communicate with the AFS Volume Server, which runs on every AFS server machine. The Volume Server allows administrative tasks and probes to be performed on the set of AFS volumes residing on the machine on which it is running. This class provides methods to create, move, delete, replicate, back up and examine AFS volumes. It has also methods to provide information about AFS partitions.

Before you can submit any tasks to a Volume Server you must establish a connection to it. This is done by the constructor method new which returns a VOS object. A VOS object is essentially a handle to talk to the Volume Server in a given cell. Such a VOS object is required before any of the other VOS instance methods can be called.

COMPATIBILITY ^

There was no version 1 implementation and hence there are no version conflicts :-)

METHODS ^

CONSTRUCTOR
 
$vos = AFS::VOS->new([VERBOSE [, TIMEOUT [, NOAUTH [, LOCALAUTH [, CELL [, ENCRYPT]]]]]);

Creates a new object of the class AFS::VOS. An AFS::VOS object is essentially a handle to talk to the Volume Server. Internally an AFS::VOS object is a pointer to a ubik_client structure, although this may change and the value returned from AFS::VOS::new should always be treaded as an opaque handle.

Set VERBOSE (default 0) to 1 to produce on the standard output stream a detailed trace of the method's execution. TIMEOUT is the time of inactivity in seconds before the connection to the VOS server is declared dead (default 90 seconds). Set LOCALAUTH (default 0) to 1 only when issuing a command on a server machine. If NOAUTH is 1 (default 0) it establishes an unauthenticated connection to the server, in which the servers treat the issuer as an unprivileged user. CELL (default NULL) specifies the cell in which to run the command. Set ENCRYPT to 1 (default 0) to encrypt the connection to the VOS server.

DESTRUCTOR
 
$vos->DESTROY;

Destroys the ubik connection to the Volume Server and frees the ubik_client structure.

INSTANCE METHODS
 
$ok = $vos->backup(VOLUME);

Clones the indicated read/write volume to create a backup version, placing it at the same site as the read/write version. VOLUME specifies either the complete name or volume ID number of the read/write source volume. It calls the AFS system library function UV_BackupVolume.

($SUCCESS, $FAILED) = $vos->backupsys([PREFIX [, SERVER [, PARTITION [, EXCLUDE [, XPREFIX [, DRYRUN]]]]]]);
($SUCCESS, $FAILED) = $vos->backupsys([\@PREFIX [, SERVER [, PARTITION [, EXCLUDE [, \@XPREFIX [, DRYRUN]]]]]]);

Clones each indicated read/write volume to create a backup version, placing each clone at the same site as its read/write source version. To clone a various numbers of volumes, combine the arguments as indicated:

 * For every volume listed in the VLDB, omit all of the arguments.

 * To clone only volumes that reside on one file server machine,
   specify the SERVER argument,

 * To clone only volumes that reside on one partition, combine the
   SERVER and the PARTITION arguments. The PARTITION argument can
   also be used alone to clone volumes that reside on the indicated
   partition on every file server machine.

 * In PREFIX a character string or regular expression is specified.
   A volume whose name includes the string is placed on the set of
   volumes to be cloned.

 * In XPREFIX a character string or regular expression is specified.
   A volume whose name includes the string is removed from the set of
   volumes to be cloned.

If EXCLUDE (default 0) is set to 1 it reverses the meaning of the PREFIX or XPREFIX argument. It returns two array references containing a list of SUCCESSfully backed up site name and a list of site name which are FAILED to backup. If DRYRUN (default 0) is set to 1 then SUCCESS contains a list of the volumes to be cloned, without actually cloning them.

It calls the AFS system library function UV_BackupVolume.

$volid = $vos->create(SERVER, PARTITION, VOLUME [, MAXQUOTA [, VOLID, ROVOLID]]);

Creates a read/write VOLUME at the site specified by the SERVER and PARTITION arguments. The volume's space quota is set to 5000 kilobyte blocks by default. Use the MAXQUOTA argument to specify a different quota.

VOLID specifies the volume ID for the read/write volume. If this argument is not specified, or the given volume ID is 0, a volume ID will be allocated for the volume automatically. The volume IDs allocated should be fine for almost all cases, so you should almost never need to specify this argument.

ROVOLID specifies the volume ID for the readonly volume corresponding to the read/write volume that is being created. The readonly volume will not be created; this merely specifies what volume ID the readonly volume will use when it is created. If a volume ID of 0 is specified here, no readonly volume ID will be assigned to the created volume immediately. A readonly volume ID can still be assigned later when vldb-addsite> is run; if a volume does not have a readonly volume ID associated with it by the time vos-:release> is run, a volume ID will be allocated for it. If this argument is not specified, the default readonly volume ID is one number higher than the read-write volume ID, whether or not that ID was manually specified. As with the VOLID argument, the default allocated volume IDs should be sufficient for almost all cases, so you should almost never need to specify this argument.

These two arguments (VOLID, ROVOLID) are supported when the AFS Perl modules are linked with the OpenAFS system libraries v1.4.12 or later.

It returns the volume id number of the new volume. It calls the AFS system library function UV_CreateVolume2 or UV_CreateVolume3 (OpenAFS v.1.4.12 or later).

$ok = $vos->dump(VOLUME [, TIME [, FILE [, SERVER, PARTITION, CLONE_FLG, OMIT_FLG]]]);

Converts the contents of the indicated volume, which can be read/write, read-only or backup, into ASCII format. VOLUME specifies either the complete name or volume ID number of the volume. The Volume Server writes the converted contents to the FILE or to the standard output stream (default). To dump the complete contents of a volume (create a full dump), set TIME to 0 (default). To create an incremental dump, which includes only the files and directories in the volume that have modification timestamps later than a certain time, specify a date and time as the value for the TIME argument. By default, the VL server consults the Volume Location Database (VLDB) to learn the volume's location. To dump the read-only volume from a particular site, use the SERVER and PARTITION arguments to specify the site.

If CLONE_FLG is set to 1 (default 0), it will clone the volume first and then dumps the clone. This can significantly decrease the amount of time the volume is kept locked for dumps of large volumes. By default, it includes all directory objects in an incremental dump whether they’ve been changed or not.

If the OMIT_FLG is set to 1 (default 0), unchanged directories will be omitted. This will reduce the size of the dump and not cause problems if the incremental is restored, as expected, on top of a volume containing the correct directory structure (such as one created by restoring previous full and incremental dumps).

These two flags are supported with OpenAFS system libraries 1.4.5 or later.

It calls the AFS system library function UV_DumpVolume.

@part = $vos->listpart(SERVER);

Returns a list of the valid AFS partitions on the indicated file SERVER machine. It calls the AFS system library function UV_ListPartitions.

$vollist = $vos->listvol(SERVER [, PARTITION [, FAST [, EXTENDED]]]);

Returns information about volume headers. The actual information returned depends on the combination of arguments supplied when the method is applied. To get volume header information for various numbers of volumes, combine the arguments as indicated:

 * For every volume on a file server machine, specify the SERVER
   argument.

 * For every volume at a particular site, combine the SERVER argument
   with the PARTITION argument.

If you set EXTENDED (default 0) to 1, it returns extensive statistics about access patterns for each volume. If you set FAST (default 0) to 1, it returns only the volume IDs and the numbers of volumes.

The return value is a reference to a hash table containing the values from the C structure volintinfo. The hash table has the following keys

       backupID    cloneID     creationDate
       dayUse      inUse       maxquota
       parentID    server      size
       status      type        updateDate
       copyDate    backupDate  accessDate
       volid

It calls the AFS system library function UV_ListPartitions.

You can find an example how to print the entire content of the returned hash reference in the examples/v2/vos directory.

$vollist = $vos->listvolume(VOLUME);

Returns information about the volume header of the indicated volume. VOLUME specifies either the complete name or volume ID number of the volume. The return value is a reference to a hash table containing the values from the C structure volintinfo. For a list of the hash keys see above.

It calls the AFS system library function UV_ListOneVolume.

You can find an example how to print the entire content of the returned hash reference in the examples/v2/vos directory.

$volid = $vos->move(VOLUME, FSERVER, FPARTITION, TSERVER, TPARTITION);

Moves the indicated read/write volume from its current site FSERVER, FPARTITION to the destination site TSERVER, TPARTITION. VOLUME specifies either the complete name or volume ID number of the volume. It returns the volume id number of the moved volume. It calls the AFS system library function UV_MoveVolume.

$ok = $vos->offline(SERVER, PARTITION, VOLUME [, BUSY, SLEEP]);

Takes the specified volume offline. VOLUME specifies either the complete name or volume ID number of the volume. If you set BUSY (default 0) to 1 the volume will be marked as busy for the specified SLEEP seconds. It calls the AFS system library function UV_SetVolume.

$ok = $vos->online(SERVER, PARTITION, VOLUME);

Brings the specified volume online. VOLUME specifies either the complete name or volume ID number of the volume. It calls the AFS system library function UV_SetVolume.

$partinfo = $vos->partinfo( SERVER [, PARTITION]);

Returns an hash reference containing the amount of space available and total size on either all of the partitions on the indicated file SERVER machine (if the PARTITION argument is omitted) or the specified PARTITION on that file server machine.

It calls the AFS system library function UV_ListPartitions.

You can find an example how to print the entire content of the returned hash reference in the examples/v2/vos directory.

$ok = $vos->release(VOLUME [, FORCE]);

Copies the contents of the indicated read/write source volume to each read-only site. VOLUME specifies either the complete name or volume ID number of the volume. If FORCE (default 0) is set to 1, a complete release is enforced. It calls the AFS system library function UV_ReleaseVolume.

$volid = $vos->remove(VOLUME [, SERVER, PARTITION]);

Removes the indicated volume. VOLUME specifies either the complete name or volume ID number of the volume. To remove the read-only volume from a particular site, specify the SERVER and PARTITION arguments. It returns the volume id number of the removed volume. It calls the AFS system library function UV_DeleteVolume.

$ok = $vos->rename(ONAME, NNAME);

Changes the name of the read/write volume from ONAME to NNAME. It calls the AFS system library function UV_RenameVolume.

$ok = $vos->restore(SERVER, PARTITION, VOLUME [, DUMPFILE [, ID [, INTER [, OVERWRITE [, OFFLINE [, READONLY]]]]]] );

Converts the ASCII file DUMPFILE or the standard input stream (default) and restores it as a read/write VOLUME to the PARTITION on the SERVER. ID specifies the volume ID number to assign to the restored volume. OVERWRITE must be specified when overwriting an existing volume. The following values are possible:

a to abort the restore operation.
f if restoring a full dump file.
i if restoring an incremental dump file.

Set OFFLINE (default 0) to 1 to leave restored volume offline. Set READONLY (default 0) to 1 to make the restored volume read-only.

If the VOLUME already exists, the OVERWRITE argument is omitted, and the INTER argument (default 0) is set to 1 the method is interactively prompting for the type of restore (exactly like the vos restore command).

It calls the AFS system library function UV_RestoreVolume.

$ok = $vos->setquota(VOLUME, QUOTA [, CLEAR]);

Sets the QUOTA for the specified volume. Specify the number of one-kilobyte blocks as a positive integer (1024 is one megabyte). VOLUME specifies either the complete name or volume ID number of the volume. Set CLEAR (default 0) to 1 to clear the access counter on the VOLUME, shown on the examine method. It calls the AFS system library function UV_SetVolumeInfo.

$stat = $vos->status(SERVER);

Reports on what the Volume Server on a certain file SERVER machine is doing at the moment the method is performed. It calls the AFS system library function UV_VolserStatus.

$volid = $vos->zap(SERVER, PARTITION, ID [, FORCE [, BACKUP]]);

Removes the specified volume ID number of the volume from the site defined by the SERVER and PARTITION arguments, without attempting to change the corresponding Volume Location Database (VLDB) entry. Set FORCE (default 0) to 1 to remove the volume even though it cannot be attached (brought online). Use this flag only after the failure of previous attempts to remove the volume. Set BACKUP (default 0) to 1 to remove the backup version of the read/write volume. It returns the volume id number of the removed volume. It calls the AFS system library function UV_VolumeZap.

AUTHORS ^

The code and documentation for this class were contributed by Stanford Linear Accelerator Center, a department of Stanford University. This documentation were written by

Alf Wachsmann <alfw@slac.stanford.edu>,
Venkata Phani Kiran Achanta <neo_phani@hotmail.com>, and
Norbert E. Gruener <nog@MPA-Garching.MPG.de>
 

COPYRIGHT AND LICENSE ^

 Copyright (c) 2005-2011 Norbert E. Gruener <nog@MPA-Garching.MPG.de>
 Copyright (c) 2003-2004 Alf Wachsmann <alfw@slac.stanford.edu>,
                         Venkata Phani Kiran Achanta <neo_phani@hotmail.com>, and
                         Norbert E. Gruener <nog@MPA-Garching.MPG.de>
 All rights reserved.

Most of the explanations in this document are taken from the original AFS documentation.

 AFS-3 Programmer's Reference:
 Volume Server/Volume Location Server Interface
 Edward R. Zayas
 Copyright (c) 1991 Transarc Corporation.
 All rights reserved.

 IBM AFS Administration Reference
 Copyright (c) IBM Corporation 2000.
 All rights reserved.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DOCUMENT VERSION ^

Revision $Rev: 1082 $

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