HP-UX Reference (11i v1 00/12) - 1M System Administration Commands N-Z (vol 4)
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1m/naaagt.1m
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v
vxdump(1M) vxdump(1M)
-s size size is the size of the dump tape, specified in feet. When the specified size is reached,
vxdump waits for reels to be changed. If -d is specified, a default size value of 2300 is
assumed for a reel tape.
-T date Use the specified date as the starting time for the dump instead of the time determined
from looking in /var/adm/dumpdates. The format of date is the same as that of
ctime(3C) This option is useful for automated dump scripts that wish to dump over a
specific period of time.
• You can specify -T only for incremental dumps; using -T for a level 0 dump returns an
error.
• -T is mutually exclusive with the -u option.
• If you enter an improperly formatted date, -T returns an error message and ter-
minates the dump.
-u If the dump completes successfully, write on file /var/adm/dumpdates the date when
the dump started. This file records a separate date for each file system and each dump
level. The format of /var/adm/dumpdates is user-readable and consists of one free-
format record per line: file system name, increment level and dump date in ctime(3C) for-
mat. The file
/var/adm/dumpdates
can be edited to change any of the fields if neces-
sary.
-W For each file system in /var/adm/dumpdates
, print the most recent dump date and
level, indicating which file systems should be dumped. If
-W is specified, all other options
are ignored and vxdump exits immediately.
-w Operate like -W, but print only file systems that need to be dumped.
Operator Interaction
vxdump requires operator intervention for any of the following conditions:
• end of tape
• end of dump
• tape-write error
• tape-open error
• disk-read error (if errors exceed threshold of 32).
In addition to alerting all operators implied by the -n option, vxdump interacts with the control terminal
operator by posing questions requiring yes or no answers when it can no longer proceed or if there is a
serious problem.
Because making a full dump typically requires considerable time, vxdump establishes a checkpoint at the
start of each tape volume. If, for any reason, writing that volume fails, vxdump, with operator permission,
restarts from the checkpoint after the old tape is rewound and removed and a new tape is mounted.
vxdump periodically reports information to the operator, including estimates (typically low) of the number
of blocks to write, the number of tapes it requires, time required to complete, and the time remaining until
tape change. The output is verbose to inform other users that the terminal controlling vxdump is busy
and will be for some time.
Compatibility
The dump tape format is independent of the VxFS disk layout. A dump of a file system with the Version 4
disk layout can be restored on a file system using the Version 2 disk layout or even a file system of another
file system type, with the following exceptions:
• Files larger than 2 GB cannot be restored by earlier versions of vxrestore. If a file larger than 2 GB
is encountered, an older vxrestore skips the file and returns this message:
Resync restore, skipped num blocks
• Files larger than 2 GB cannot be restored on a file system that does not support large files (see
mount_vxfs(1M)).
• A file with a large uid (user ID of the file owner) or large gid (group ID of the file owner) cannot be
restored correctly on a file system that does not support large IDs. Instead, the owner and/or group of
the file will be that of the user invoking vxrestore . (A large ID is a value greater than 65535. The
VxFS Version 2 disk layout does not support large IDs).
HP-UX Release 11i: December 2000 − 2 − Section 1M−−1045
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