voldump

NAME

voldump - Dump an AFS volume without using the Volume Server

SYNOPSIS

voldump -part <partition> -volumeid < volume id>
[ -file <dump file>] [-time <dump from time>]
[ -pad-errors] [-verbose] [-help] voldump -p <partition> -vo <volume id>
[ -f <dump file>] [-time <dump from time>]
[ -ve] [-h]

DESCRIPTION

voldump dumps an AFS volume in the format used by vos dump without using the Volume Server. It must be run on the file server machine and usually must be run as the superuser "root" to have permissions to read the file server data. It's primary use is to recover data from a file server machine where the Volume Server cannot be started for some reason. The dump output will go to standard output, or to a file if -file is specified. vos restore can be used to load the resulting dump into a new AFS volume. voldump always does a full dump.

CAUTIONS

Normally, use vos dump instead of this command. voldump is a tool of last resort to try to extract data from the raw data structures stored on the file server machine and is not as regularly tested or used as the normal vos dump implementation. If the AFS volume being dumped changes while voldump is running, the results may be inconsistent. If the File Server and Volume Server are running, stop them with bos shutdown or a similar method before running this command.

OPTIONS

-part <partition>

Names the partition on which the volume to be dumped is located. voldump does not take the normal full range of ways of specifying a partition. Instead, partition must be either a single letter between "a" and "z", corresponding to /vicepa through /vicepz, or the full path to the file server partition. "aa" is not recognized; use /vicepaa instead.

-volumeid <volume id>

Specifies the ID of the volume to dump. The volume must be specified by numeric ID, not by name.

-file <dump file>

Specifies the output file for the dump. If this option is not given, the volume will be dumped to standard output.

-time <dump from time>

Specifies whether the dump is full or incremental. Omit this argument to create a full dump, or provide one of the valid values listed in vos_dump(1).

-pad-errors

When reading vnode data from disk, if voldump encounters an I/O error or unexpected EOF, by default voldump will print an error and exit. If -pad-errors is given, instead voldump will pad the unreadable region with NUL bytes, and continue with the dump. This option may be useful when trying to extract data from volumes where the underlying disk is failing, or the volume data is corrupted. Data may be missing from files in the volume in such cases (replaced by NUL bytes), but at least some data may be extracted.

-verbose

Asks for a verbose trace of the dump process. This trace information will be sent to standard error.

-help

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

EXAMPLES

The following command dumps the volume 1936964939 on the /vicepb partition to the file /tmp/volume.dump:

    % voldump -part /vicepb -volumeid 1936964939 -file /tmp/volume.dump

PRIVILEGE REQUIRED

The issuer must have read access to the file server data stored in the specified partition. Usually, this means that the issuer must be the local superuser "root" on the file server machine.

SEE ALSO

bos_shutdown(8), restorevol(1), volserver(8), vos_dump(1), vos_restore(1)

COPYRIGHT

Copyright 2005 Russ Allbery <[email protected]> This documentation is covered by the IBM Public License Version 1.0. This man page was written by Russ Allbery for OpenAFS.