NAME

       dasalvager - Initializes the Salvager component of the dafs process

SYNOPSIS

       dasalvager
           [initcmd] [-partition <name of partition to salvage>]
           [-volumeid <volume id to salvage>] [-debug] [-nowrite]
           [-inodes] [-force] [-oktozap] [-rootinodes]
           [-salvagedirs] [-blockreads]
           [-parallel <# of max parallel partition salvaging>]
           [-tmpdir <name of dir to place tmp files>]
           [-showlog] [-showsuid] [-showmounts]
           [-orphans (ignore | remove | attach)] [-help]

DESCRIPTION

       The dasalvager command initializes the Salvager component of the "dafs" process. In the
       conventional configuration, its binary file is located in the /usr/lib/openafs directory
       on a file server machine.

       The Salvager restores internal consistency to corrupted read/write volumes on the local
       file server machine 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.

       Unlike other server process initialization commands, the Salvager command is designed to
       be issued at the command shell prompt, as well as being placed into a file server
       machine's /etc/openafs/BosConfig file with the bos create command. It is also possible to
       invoke the Salvager remotely by issuing the bos salvage command.

       Combine the command's options as indicated to salvage different numbers of read/write
       volumes:

       •   To salvage all volumes on the file server machine, provide no arguments.  No volumes
           on the machine are accessible to Cache Managers during the salvage, because the BOS
           Server stops the File Server and Volume Server processes while the Salvager runs.

       •   To salvage all of the volumes on one partition, provide the -partition argument. As
           for a salvage of all volumes on the machine, no volumes on the machine are accessible
           to Cache Managers during the salvage operation.

       •   To salvage only one volume, combine the -partition and -volumeid arguments. Only that
           volume is inaccessible to Cache Managers, because the BOS Server does not shutdown the
           File Server and Volume Server processes.

       The Salvager normally salvages only those read/write volumes that are marked as having
       been active when a crash occurred. To have it salvage all relevant read/write volumes, add
       the -force flag.

       The Salvager normally creates new inodes as it repairs damage. If the partition is so full
       that there is no room for new inodes, use the -nowrite argument to bringing undamaged
       volumes online without attempting to salvage damaged volumes. Then use the vos move
       command to move one or more of the undamaged volumes to other partitions, freeing up the
       space that the Salvager needs to create new inodes.

       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 as if they were on separate disks, provide the string "all" as
       the value for the -parallel argument.

       To set both parameters at the same time, append the number of Salvager processes to the
       string "all". For example, "-parallel all5" treats each partition as a separate disk and
       runs five Salvager processes, thus salvaging five partitions at a time.

       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.

       To generate a list of all mount points that reside in one or more volumes, rather than
       actually salvaging them, include the -showmounts flag.

       This command does not use the syntax conventions of the AFS command suites. Provide the
       command name and all option names in full.

OPTIONS

       [initcmd]
           Accommodates the command's use of the AFS command parser, and is optional.

       -partition <name of partition to salvage>
           Specifies the name of the partition to salvage. Specify the full partition name using
           the form /vicepx or /vicepxx. Omit this argument to salvage every partition on the
           file server machine.

       -volumeid <volume id to salvage>
           Specifies the volume ID of a specific read/write volume to salvage.  The -partition
           argument must be provided along with this one and specify the volume's actual site.

       -debug
           Allows only one Salvager subprocess to run at a time, regardless of the setting of the
           -parallel option. Include it when running the Salvager in a debugger to make the trace
           easier to interpret.

       -nowrite
           Brings all undamaged volumes online without attempting to salvage any damaged volumes.

       -inodes
           Records in the /var/log/openafs/SalvageLog file a list of all AFS inodes that the
           Salvager modified.

       -force
           Inspects all volumes for corruption, not just those that are marked as having been
           active when a crash occurred.

       -oktozap
           Removes a volume that is so damaged that even issuing the vos zap command with the
           -force flag is ineffective. Combine it with the -partition and -volumeid arguments to
           identify the volume to remove.  Using this flag will destroy data that cannot be read,
           so use only with caution and when you're certain that nothing in that volume is still
           needed.

       -rootinodes
           Records in the /var/log/openafs/SalvageLog file a list of all AFS inodes owned by the
           local superuser "root".

       -salvagedirs
           Salvages entire directory structures, even if they do not appear to be damaged. By
           default, the Salvager salvages a directory only if it is flagged as corrupted.

       -blockreads
           Forces the Salvager to read a partition one disk block (512 bytes) at a time and to
           skip any blocks that are too badly damaged to be salvaged.  This allows it to salvage
           as many volumes as possible. By default, the Salvager reads large disk blocks, which
           can cause it to exit prematurely if it encounters disk errors. Use this flag if the
           partition to be salvaged has disk errors.

       -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 but partitions on the same
           device are salvaged serially.

       -tmpdir <name of dir to place tmp files>
           Names a local disk directory in which the Salvager places the temporary files it
           creates during a salvage operation, instead of writing them to the partition being
           salvaged (the default). If the Salvager cannot write to the specified directory, it
           attempts to write to the partition being salvaged.

       -showlog
           Displays on the standard output stream all log data that is being written to the
           /var/log/openafs/SalvageLog file.

       -showsuid
           Displays a list of the pathnames for all files that have the setuid or setgid mode bit
           set.

       -showmounts
           Records in the /var/log/openafs/SalvageLog file all mount points found in each volume.
           The Salvager does not repair corruption in the volumes, if any exists.

       -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.

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

EXAMPLES

       The following command instructs the Salvager to attempt to salvage the volume with volume
       ID 258347486 on /vicepg on the local machine.

          % /usr/lib/openafs/dasalvager -partition /vicepg -volumeid 258347486

PRIVILEGE REQUIRED

       To issue the command at the shell prompt, the issuer must be logged in as the local
       superuser "root".

SEE ALSO

       BosConfig(5), SalvageLog(5), bos_create(8), bos_getlog(8), bos_salvage(8), vos_move(1)

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.