NAME

       bos_salvage - Restores internal consistency to a file system or volume

SYNOPSIS

       bos salvage -server <machine name>
           [-partition <salvage partition>]
           [-volume <salvage volume number or volume name>]
           [-file <salvage log output file>] [-all] [-showlog]
           [-parallel <# of max parallel partition salvaging>]
           [-tmpdir <directory to place tmp files>]
           [-orphans (ignore | remove | attach)] [-cell <cell name>]
           [-forceDAFS]
           [-noauth] [-localauth] [-help]

       bos sa -se <machine name> [-part <salvage partition>]
           [-v <salvage volume number or volume name>]
           [-f <salvage log output file>] [-a] [-sh]
           [<-para> <# of max parallel partition salvaging>]
           [-t <directory to place tmp files>]
           [-o (ignore | remove | attach)] [-c <cell name>] [-n]
           [-force]
           [-l] [-h]

DESCRIPTION

       The bos salvage command salvages (restores internal consistency to) one or more volumes on
       the file server machine named by the -server argument. When processing one or more
       partitions, the command restores consistency to corrupted read/write volumes where
       possible. For read-only or backup volumes, it inspects only the volume header:

       •   If the volume header is corrupted, the Salvager removes the volume completely and
           records the removal in its log file, /var/log/openafs/SalvageLog. Issue the vos
           release or vos backup command to create the read-only or backup volume again.

       •   If the volume header is intact, the Salvager skips the volume (does not check for
           corruption in the contents). However, if the File Server notices corruption as it
           initializes, it sometimes refuses to attach the volume or bring it online. In this
           case, it is simplest to remove the volume by issuing the vos remove or vos zap
           command. Then issue the vos release or vos backup command to create it again.

       Use the indicated arguments to salvage a specific number of volumes:

       •   To process all volumes on a file server machine, provide the -server argument and the
           -all flag. No volumes on the machine are accessible to Cache Managers during the
           salvage operation, because the BOS Server stops the File Server and Volume Server
           processes while the Salvager runs. The BOS Server automatically restarts them when the
           operation completes.

       •   To process all volumes on one partition, provide the -server and -partition arguments.
           As for a salvage of the entire machine, no volumes on the machine are accessible to
           Cache Managers during the salvage operation. The BOS Server automatically restarts the
           File Server and Volume Server when the operation completes.

       •   To salvage only one read/write volume, combine the -server, -partition, and -volume
           arguments. Only that volume is inaccessible to Cache Managers, because the BOS Server
           does not shutdown the File Server and Volume Server processes during the salvage of a
           single volume. Do not name a read-only or backup volume with the -volume argument.
           Instead, remove the volume, using the vos remove or vos zap command. Then create a new
           copy of the volume with the vos release or vos backup command.

       During the salvage of an entire machine or partition, the bos status command reports the
       "fs" process's auxiliary status as "Salvaging file system".

       The Salvager always writes a trace to the /var/log/openafs/SalvageLog file on the file
       server machine where it runs. To record the trace in another file as well (either in AFS
       or on the local disk of the machine where the bos salvage command is issued), name the
       file with the -file argument. To display the trace on the standard output stream as it is
       written to the /var/log/openafs/SalvageLog file, include the -showlog flag.

       By default, multiple Salvager subprocesses run in parallel: one for each partition up to
       four, and four subprocesses for four or more partitions. To increase or decrease the
       number of subprocesses running in parallel, provide a positive integer value for the
       -parallel argument.

       If there is more than one server partition on a physical disk, the Salvager by default
       salvages them serially to avoid the inefficiency of constantly moving the disk head from
       one partition to another. However, this strategy is often not ideal if the partitions are
       configured as logical volumes that span multiple disks. To force the Salvager to salvage
       logical volumes in parallel, provide the string "all" as the value for the -parallel
       argument. Provide a positive integer to specify the number of subprocesses to run in
       parallel (for example, "-parallel 5all" for five subprocesses), or omit the integer to run
       up to four subprocesses, depending on the number of logical volumes being salvaged.

       The Salvager creates temporary files as it runs, by default writing them to the partition
       it is salvaging. The number of files can be quite large, and if the partition is too full
       to accommodate them, the Salvager terminates without completing the salvage operation (it
       always removes the temporary files before exiting). Other Salvager subprocesses running at
       the same time continue until they finish salvaging all other partitions where there is
       enough disk space for temporary files. To complete the interrupted salvage, reissue the
       command against the appropriate partitions, adding the -tmpdir argument to redirect the
       temporary files to a local disk directory that has enough space.

       The -orphans argument controls how the Salvager handles orphaned files and directories
       that it finds on server partitions it is salvaging. An orphaned element is completely
       inaccessible because it is not referenced by the vnode of any directory that can act as
       its parent (is higher in the filespace). Orphaned objects occupy space on the server
       partition, but do not count against the volume's quota.

CAUTIONS

       Running this command can result in data loss if the Salvager process can repair corruption
       only by removing the offending data. Consult the OpenAFS Administration Guide for more
       information.

OPTIONS

       -server <machine name>
           Indicates the file server machine on which to salvage volumes.  Identify the machine
           by IP address or its host name (either fully-qualified or abbreviated unambiguously).
           For details, see bos(8).

       -partition <salvage partition>
           Specifies a single partition on which to salvage all volumes.  Provide the complete
           partition name (for example /vicepa) or one of the following abbreviated forms:

              /vicepa     =     vicepa      =      a      =      0
              /vicepb     =     vicepb      =      b      =      1

           After /vicepz (for which the index is 25) comes

              /vicepaa    =     vicepaa     =      aa     =      26
              /vicepab    =     vicepab     =      ab     =      27

           and so on through

              /vicepiv    =     vicepiv     =      iv     =      255

       -volume <salvage volume id or name>
           Specifies the name or volume ID number of a read/write volume to salvage. The
           -partition argument must be provided along with this one.

       -file <salvage log output file>
           Specifies the complete pathname of a file into which to write a trace of the salvage
           operation, in addition to the /var/log/openafs/SalvageLog file on the server machine.
           If the file pathname is local, the trace is written to the specified file on the local
           disk of the machine where the bos salvage command is issued. If the -volume argument
           is included, the file can be in AFS, though not in the volume being salvaged. Do not
           combine this argument with the -showlog flag.

       -all
           Salvages all volumes on all of the partitions on the machine named by the -server
           argument.

       -showlog
           Displays the trace of the salvage operation on the standard output stream, as well as
           writing it to the /var/log/openafs/SalvageLog file.  Do not combine this flag with the
           -file argument.

       -parallel <# of max parallel partition salvaging>
           Specifies the maximum number of Salvager subprocesses to run in parallel. Provide one
           of three values:

           •   An integer from the range 1 to 32. A value of 1 means that a single Salvager
               process salvages the partitions sequentially.

           •   The string "all" to run up to four Salvager subprocesses in parallel on partitions
               formatted as logical volumes that span multiple physical disks. Use this value
               only with such logical volumes.

           •   The string all followed immediately (with no intervening space) by an integer from
               the range 1 to 32, to run the specified number of Salvager subprocesses in
               parallel on partitions formatted as logical volumes. Use this value only with such
               logical volumes.

           The BOS Server never starts more Salvager subprocesses than there are partitions, and
           always starts only one process to salvage a single volume. If this argument is
           omitted, up to four Salvager subprocesses run in parallel.

       -tmpdir <directory to place tmp files>
           Specifies the full pathname of a local disk directory to which the Salvager process
           writes temporary files as it runs. If this argument is omitted, or specifies an
           ineligible or nonexistent directory, the Salvager process writes the files to the
           partition it is currently salvaging.

       -orphans (ignore | remove | attach)
           Controls how the Salvager handles orphaned files and directories.  Choose one of the
           following three values:

           ignore
               Leaves the orphaned objects on the disk, but prints a message to the
               /var/log/openafs/SalvageLog file reporting how many orphans were found and the
               approximate number of kilobytes they are consuming. This is the default if the
               -orphans argument is omitted.

           remove
               Removes the orphaned objects, and prints a message to the
               /var/log/openafs/SalvageLog file reporting how many orphans were removed and the
               approximate number of kilobytes they were consuming.

           attach
               Attaches the orphaned objects by creating a reference to them in the vnode of the
               volume's root directory. Since each object's actual name is now lost, the Salvager
               assigns each one a name of the following form:

               •   "__ORPHANFILE__.index" for files.

               •   "__ORPHANDIR__.index" for directories.

               where index is a two-digit number that uniquely identifies each object. The
               orphans are charged against the volume's quota and appear in the output of the ls
               command issued against the volume's root directory.

       -forceDAFS
           If the fileserver is a Demand Attach File Server, then the -forceDAFS flag must be
           provided in order for the salvager to run.

       -cell <cell name>
           Names the cell in which to run the command. Do not combine this argument with the
           -localauth flag. For more details, see bos(8).

       -noauth
           Assigns the unprivileged identity "anonymous" to the issuer. Do not combine this flag
           with the -localauth flag. For more details, see bos(8).

       -localauth
           Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile
           file. The bos command interpreter presents the ticket to the BOS Server during mutual
           authentication. Do not combine this flag with the -cell or -noauth options. For more
           details, see bos(8).

       -help
           Prints the online help for this command. All other valid options are ignored.

EXAMPLES

       The following command salvages all volumes on the /vicepd partition of the machine
       "db3.abc.com":

          % bos salvage -server db3.abc.com -partition /vicepd

       The following command salvages the volume with volume ID number 536870988 on partition
       /vicepb of the machine "fs2.abc.com":

          % bos salvage -server fs2.abc.com -partition /vicepb -volume 536870988

       The following command salvages all volumes on the machine "fs4.abc.com". Six Salvager
       processes run in parallel rather than the default four.

          % bos salvage -server fs4.abc.com -all -parallel 6

PRIVILEGE REQUIRED

       The issuer must be listed in the /etc/openafs/server/UserList file on the machine named by
       the -server argument, or must be logged onto a server machine as the local superuser
       "root" if the -localauth flag is included.

SEE ALSO

       KeyFile(5), SalvageLog(5), UserList(5), bos(8), salvager(8), salvagserver(8),
       vos_backup(1), vos_release(1), vos_remove(1), vos_zap(1)

       The OpenAFS Administration Guide at <http://docs.openafs.org/AdminGuide/>.

COPYRIGHT

       IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.

       This documentation is covered by the IBM Public License Version 1.0.  It was converted
       from HTML to POD by software written by Chas Williams and Russ Allbery, based on work by
       Alf Wachsmann and Elizabeth Cassell.