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fc5acc0151
Implement proper synopsis wrapping for HTML generation. This was done in three pieces. First, add HTML-specific tags to the POD to mark the synopsis for HTML purposes so that we can apply style information to it. Second, update the style sheet to indent all lines except for the first in the synopsis section. Third, add the appropriate S<> tags around option and argument pairs so that we don't wrap between the option and its argument. Unfortunately, due to the <I<foo>> style that looks nicer for other reasons, we have to use the very verbose S<<< >>>. Oh well.
335 lines
12 KiB
Plaintext
335 lines
12 KiB
Plaintext
=head1 NAME
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salvager - Initializes the Salvager component of the fs process
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=head1 SYNOPSIS
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=for html
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<div class="synopsis">
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B<salvager> [I<initcmd>] S<<< [B<-partition> <I<name of partition to salvage>>] >>>
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S<<< [B<-volumeid> <I<volume id to salvage>>] >>> [B<-debug>] [B<-nowrite>]
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[B<-inodes>] [B<-force>] [B<-oktozap>] [B<-rootinodes>]
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[B<-salvagedirs>] [B<-blockreads>]
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S<<< [B<-parallel> <I<# of max parallel partition salvaging>>] >>>
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S<<< [B<-tmpdir> <I<name of dir to place tmp files>>] >>>
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[B<-showlog>] [B<-showsuid>] [B<-showmounts>]
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S<<< [B<-orphans> (ignore | remove | attach)] >>> [B<-help>]
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=for html
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</div>
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=head1 DESCRIPTION
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The B<salvager> command initializes the Salvager component of the C<fs>
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process. In the conventional configuration, its binary file is located in
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the F</usr/afs/bin> directory on a file server machine.
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The Salvager restores internal consistency to corrupted read/write volumes
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on the local file server machine where possible. For read-only or backup
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volumes, it inspects only the volume header:
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=over 4
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=item *
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If the volume header is corrupted, the Salvager removes the volume
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completely and records the removal in its log file,
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F</usr/afs/logs/SalvageLog>. Issue the B<vos release> or B<vos backup>
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command to create the read-only or backup volume again.
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=item *
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If the volume header is intact, the Salvager skips the volume (does not
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check for corruption in the contents). However, if the File Server notices
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corruption as it initializes, it sometimes refuses to attach the volume or
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bring it online. In this case, it is simplest to remove the volume by
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issuing the B<vos remove> or B<vos zap> command. Then issue the B<vos
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release> or B<vos backup> command to create it again.
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=back
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Unlike other server process initialization commands, the B<salvager>
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command is designed to be issued at the command shell prompt, as well as
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being placed into a file server machine's F</usr/afs/local/BosConfig> file
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with the B<bos create> command. It is also possible to invoke the Salvager
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remotely by issuing the B<bos salvage> command.
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Combine the command's options as indicated to salvage different numbers of
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read/write volumes:
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=over 4
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=item *
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To salvage all volumes on the file server machine, provide no arguments.
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No volumes on the machine are accessible to Cache Managers during the
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salvage, because the BOS Server stops the File Server and Volume Server
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processes while the Salvager runs.
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=item *
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To salvage all of the volumes on one partition, provide the B<-partition>
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argument. As for a salvage of all volumes on the machine, no volumes on
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the machine are accessible to Cache Managers during the salvage operation.
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=item *
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To salvage only one volume, combine the B<-partition> and B<-volumeid>
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arguments. Only that volume is inaccessible to Cache Managers, because the
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BOS Server does not shutdown the File Server and Volume Server processes.
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=back
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The Salvager normally salvages only those read/write volumes that are
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marked as having been active when a crash occurred. To have it salvage all
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relevant read/write volumes, add the B<-force> flag.
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The Salvager normally creates new inodes as it repairs damage. If the
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partition is so full that there is no room for new inodes, use the
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B<-nowrite> argument to bringing undamaged volumes online without
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attempting to salvage damaged volumes. Then use the B<vos move> command to
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move one or more of the undamaged volumes to other partitions, freeing up
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the space that the Salvager needs to create new inodes.
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By default, multiple Salvager subprocesses run in parallel: one for each
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partition up to four, and four subprocesses for four or more
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partitions. To increase or decrease the number of subprocesses running in
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parallel, provide a positive integer value for the B<-parallel> argument.
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If there is more than one server partition on a physical disk, the
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Salvager by default salvages them serially to avoid the inefficiency of
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constantly moving the disk head from one partition to another. However,
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this strategy is often not ideal if the partitions are configured as
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logical volumes that span multiple disks. To force the Salvager to salvage
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logical volumes in parallel, provide the string C<all> as the value for
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the B<-parallel> argument. Provide a positive integer to specify the
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number of subprocesses to run in parallel (for example, C<-parallel 5all>
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for five subprocesses), or omit the integer to run up to four
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subprocesses, depending on the number of logical volumes being salvaged.
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The Salvager creates temporary files as it runs, by default writing them
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to the partition it is salvaging. The number of files can be quite large,
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and if the partition is too full to accommodate them, the Salvager
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terminates without completing the salvage operation (it always removes the
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temporary files before exiting). Other Salvager subprocesses running at
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the same time continue until they finish salvaging all other partitions
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where there is enough disk space for temporary files. To complete the
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interrupted salvage, reissue the command against the appropriate
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partitions, adding the B<-tmpdir> argument to redirect the temporary files
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to a local disk directory that has enough space.
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The B<-orphans> argument controls how the Salvager handles orphaned files
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and directories that it finds on server partitions it is salvaging. An
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I<orphaned> element is completely inaccessible because it is not
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referenced by the vnode of any directory that can act as its parent (is
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higher in the filespace). Orphaned objects occupy space on the server
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partition, but do not count against the volume's quota.
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To generate a list of all mount points that reside in one or more volumes,
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rather than actually salvaging them, include the B<-showmounts> flag.
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This command does not use the syntax conventions of the AFS command
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suites. Provide the command name and all option names in full.
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=head1 OPTIONS
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=over 4
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=item [I<initcmd>]
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Accommodates the command's use of the AFS command parser, and is optional.
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=item B<-partition> <I<name of partition to salvage>>
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Specifies the name of the partition to salvage. Specify the full partition
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name using the form F</vicepI<x>> or F</vicepI<xx>>. Omit this argument to
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salvage every partition on the file server machine.
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=item B<-volumeid> <I<volume id to salvage>>
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Specifies the volume ID of a specific read/write volume to salvage. The
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B<-partition> argument must be provided along with this one and specify
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the volume's actual site.
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=item B<-debug>
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Allows only one Salvager subprocess to run at a time, regardless of the
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setting of the B<-parallel> option. Include it when running the Salvager
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in a debugger to make the trace easier to interpret.
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=item B<-nowrite>
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Brings all undamaged volumes online without attempting to salvage any
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damaged volumes.
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=item B<-inodes>
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Records in the F</usr/afs/logs/SalvageLog> file a list of all AFS inodes
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that the Salvager modified.
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=item B<-force>
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Inspects all volumes for corruption, not just those that are marked as
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having been active when a crash occurred.
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=item B<-oktozap>
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Removes a volume that is so damaged that even issuing the B<vos zap>
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command with the B<-force> flag is ineffective. Use this argument only in
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consultation with AFS Development or Product Support. Combine it with the
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B<-partition> and B<-volumeid> arguments to identify the volume to remove.
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=item B<-rootinodes>
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Records in the F</usr/afs/logs/SalvageLog> file a list of all AFS inodes
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owned by the local superuser C<root>.
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=item B<-salvagedirs>
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Salvages entire directory structures, even if they do not appear to be
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damaged. By default, the Salvager salvages a directory only if it is
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flagged as corrupted.
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=item B<-blockreads>
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Forces the Salvager to read a partition one disk block (512 bytes) at a
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time and to skip any blocks that are too badly damaged to be salvaged.
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This allows it to salvage as many volumes as possible. By default, the
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Salvager reads large disk blocks, which can cause it to exit prematurely
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if it encounters disk errors. Use this flag if the partition to be
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salvaged has disk errors.
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=item B<-parallel> <I<# of max parallel partition salvaging>>
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Specifies the maximum number of Salvager subprocesses to run in parallel.
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Provide one of three values:
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=over 4
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=item *
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An integer from the range C<1> to C<32>. A value of C<1> means that a
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single Salvager process salvages the partitions sequentially.
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=item *
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The string C<all> to run up to four Salvager subprocesses in parallel on
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partitions formatted as logical volumes that span multiple physical
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disks. Use this value only with such logical volumes.
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=item *
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The string C<all> followed immediately (with no intervening space) by an
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integer from the range C<1> to C<32>, to run the specified number of
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Salvager subprocesses in parallel on partitions formatted as logical
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volumes. Use this value only with such logical volumes.
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=back
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The BOS Server never starts more Salvager subprocesses than there are
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partitions, and always starts only one process to salvage a single
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volume. If this argument is omitted, up to four Salvager subprocesses run
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in parallel.
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=item B<-tmpdir> <I<name of dir to place tmp files>>
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Names a local disk directory in which the Salvager places the temporary
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files it creates during a salvage operation, instead of writing them to
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the partition being salvaged (the default). If the Salvager cannot write
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to the specified directory, it attempts to write to the partition being
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salvaged.
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=item B<-showlog>
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Displays on the standard output stream all log data that is being written
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to the F</usr/afs/logs/SalvageLog> file.
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=item B<-showsuid>
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Displays a list of the pathnames for all files that have the setuid or
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setgid mode bit set.
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=item B<-showmounts>
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Records in the F</usr/afs/logs/SalvageLog> file all mount points found in
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each volume. The Salvager does not repair corruption in the volumes, if
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any exists.
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=item B<-orphans> (ignore | remove | attach)
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Controls how the Salvager handles orphaned files and directories. Choose
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one of the following three values:
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=over 4
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=item ignore
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Leaves the orphaned objects on the disk, but prints a message to the
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F</usr/afs/logs/SalvageLog> file reporting how many orphans were found and
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the approximate number of kilobytes they are consuming. This is the
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default if the B<-orphans> argument is omitted.
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=item remove
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Removes the orphaned objects, and prints a message to the
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F</usr/afs/logs/SalvageLog> file reporting how many orphans were removed
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and the approximate number of kilobytes they were consuming.
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=item attach
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Attaches the orphaned objects by creating a reference to them in the vnode
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of the volume's root directory. Since each object's actual name is now
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lost, the Salvager assigns each one a name of the following form:
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=over 4
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=item C<__ORPHANFILE__.I<index>> for files.
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=item C<__ORPHANDIR__.I<index>> for directories.
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=back
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where I<index> is a two-digit number that uniquely identifies each
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object. The orphans are charged against the volume's quota and appear in
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the output of the B<ls> command issued against the volume's root
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directory.
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=back
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=item B<-help>
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Prints the online help for this command. All other valid options are
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ignored.
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=back
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=head1 EXAMPLES
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The following command instructs the Salvager to attempt to salvage the
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volume with volume ID 258347486 on F</vicepg> on the local machine.
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% /usr/afs/bin/salvager -partition /vicepg -volumeid 258347486
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=head1 PRIVILEGE REQUIRED
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To issue the command at the shell prompt, the issuer must be logged in as
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the local superuser C<root>.
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=head1 SEE ALSO
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L<BosConfig(5)>,
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L<SalvageLog(5)>,
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L<bos_create(8)>,
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L<bos_getlog(8)>,
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L<bos_salvage(8)>,
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L<vos_move(1)>
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=head1 COPYRIGHT
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IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
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This documentation is covered by the IBM Public License Version 1.0. It was
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converted from HTML to POD by software written by Chas Williams and Russ
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Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
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