vos_dump - Online in the Cloud

PROGRAM:

NAME

vos_dump - Converts a volume into ASCII format and writes it to a file

SYNOPSIS

vos dump -id <volume name or ID>
[-time <dump from time>]
[-file <dump file>] [-server <server>]
[-partition <partition>] [-clone] [-omitdirs]
[-cell <cell name>] [-noauth] [-localauth]
[-verbose] [-encrypt] [-noresolve] [-help]

vos du -i <volume name or ID>
[-t <dump from time>]
[-f <dump file>] [-s <server>]
[-p <partition>]
[-cl] [-o] [-ce <cell name>] [-noa] [-l]
[-v] [-e] [-nor] [-h]

DESCRIPTION

The vos dump command converts the contents of the indicated volume, which can be
read/write, read-only or backup, into ASCII format. The Volume Server writes the converted
contents to the file named by the -file argument, or to the standard output stream. In the
latter case, the output can be directed to a named pipe, which enables interoperation with
third-party backup utilities.

To dump the complete contents of a volume (create a full dump), omit the -time argument or
specify the value 0 (zero) for it. 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 vos command interpreter consults the Volume Location Database (VLDB) to
learn the volume's location, so the -server and -partition arguments are not required. If
the -id argument identifies a read-only volume that resides at multiple sites, the command
dumps the version from just one of them (normally, the one listed first in the volume's
VLDB entry as reported by the vos examine or vos listvldb command). To dump the read-only
volume from a particular site, use the -server and -partition arguments to specify the
site. To bypass the VLDB lookup entirely, provide a volume ID number (rather than a volume
name) as the value for the -id argument, together with the -server and -partition
arguments. This makes it possible to dump a volume for which there is no VLDB entry.

During the dump operation, the volume is inaccessible both to Cache Managers and to other
volume operations. Dumping a volume does not otherwise affect its status on the partition
or its VLDB entry.

To restore a dumped volume back into AFS, use the vos restore command.

CAUTIONS

Support for incremental dumps is provided to facilitate interoperation with third-party
backup utilities. The vos dump command does not provide any of the administrative
facilities of an actual backup system, so the administrator must keep manual records of
dump times and the relationship between full and incremental dumps of a volume. For a
volume's contents to be consistent after restoration of incremental dumps, there must be
no gap between the time at which a prior dump of the volume was created and the value of
the -time argument to the vos dump command that creates the incremental dump. More
specifically, for a read/write volume, the -time argument must specify the time that the
prior dump was performed, and for a read-only or backup volume it must specify the time
that the volume was last released (using the vos release command) or cloned (using the vos
backup or vos backupsys command) prior to dumping it. The parent dump can be either a full
dump or another incremental dump.

OPTIONS

-id <volume name or ID>
Specifies either the complete name or volume ID number of the read/write, read-only,
or backup volume to dump.

-time <dump from time>
Specifies whether the dump is full or incremental. Omit this argument to create a full
dump, or provide one of three acceptable values:

· The value 0 (zero) to create a full dump.

· A date in the format mm/dd/yyyy (month, day and year) to create an incremental
dump that includes only files and directories with modification timestamps later
than midnight (12:00 a.m.) on the indicated date. Valid values for the year range
from 1970 to 2037; higher values are not valid because the latest possible date in
the standard UNIX representation is in 2038. The command interpreter automatically
reduces later dates to the maximum value. An example is "01/13/1999".

· A date and time in the format "mm/dd/yyyy hh:MM" to create an incremental dump
that includes only files and directories with modification timestamps later than
the specified date and time. The date format is the same as for a date alone.
Express the time as hours and minutes (hh:MM) in 24-hour format (for example,
20:30 is 8:30 p.m.). Surround the entire expression with double quotes ("")
because it contains a space. An example is "01/13/1999 22:30".

-file <dump file>
Specifies the pathname of the file to which to write the dump. The file can be in AFS,
but not in the volume being dumped. A partial pathname is interpreted relative to the
current working directory. If this argument is omitted, the dump is directed to the
standard output stream.

-server <server name>
Specifies the file server machine on which the volume resides. Provide the -partition
argument along with this one.

-partition <partition name>
Specifies the partition on which the volume resides. Provide the -server argument
along with this one.

-clone
Normally, vos dump locks the volume and dumps it, which blocks writes to the volume
while the dump is in progress. If this flag is given, vos dump will instead clone the
volume first (similar to what vos move would do) and then dumps the clone. This can
significantly decrease the amount of time the volume is kept locked for dumps of large
volumes.

-omitdirs
By default, vos dump includes all directory objects in an incremental dump whether
they've been changed or not. If this option is given, 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).

-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 vos(1).

-noauth
Assigns the unprivileged identity anonymous to the issuer. Do not combine this flag
with the -localauth flag. For more details, see vos(1).

-localauth
Constructs a server ticket using a key from the local /etc/openafs/server/KeyFile
file. The vos command interpreter presents it to the Volume Server and Volume Location
Server during mutual authentication. Do not combine this flag with the -cell argument
or -noauth flag. For more details, see vos(1).

-verbose
Produces on the standard error stream a detailed trace of the command's execution. If
this argument is omitted, only warnings and error messages appear.

-encrypt
Encrypts the command so that the operation's results are not transmitted across the
network in clear text. This option is available in OpenAFS versions 1.4.11 or later
and 1.5.60 or later.

-noresolve
Shows all servers as IP addresses instead of the DNS name. This is very useful when
the server address is registered as 127.0.0.1 or when dealing with multi-homed
servers. This option is available in OpenAFS versions 1.4.8 or later and 1.5.35 or
later.

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

EXAMPLES

The following command writes a full dump of the volume "user.terry" to the file
/afs/abc.com/common/dumps/terry.dump.

% vos dump -id user.terry -time 0 -file /afs/abc.com/common/dumps/terry.dump

The following command writes an incremental dump of the volume "user.smith" to the file
"smith.990131.dump" in the current working directory. Only those files in the volume with
modification time stamps later than 6:00 p.m. on 31 January 1999 are included in the dump.

% vos dump -id user.smith -time "01/31/1999 18:00" -file smith.990131.dump

PRIVILEGE REQUIRED

The issuer must be listed in the /etc/openafs/server/UserList file on the machine
specified with the -server argument and on each database server machine. If the -localauth
flag is included, the issuer must instead be logged on to a server machine as the local
superuser "root".

If the -file argument is included, the issuer must also have permission to insert and
write in the directory that houses the file.

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