frecover.1m (2010 09)

frecover(1M) frecover(1M)

(TO BE OBSOLETED)

The utility set comprised of fbackup and

frecover was originally designed for use on systems

equipped with not more than one gigabyte of total ﬁle system storage. Although the utilities have no pro-

gramming limitations that restrict users to this size, complete backups and recoveries of substantially

larger systems can cause a large amount of system activity due to the amount of virtual memory (swap

space) used to store the indices. Users who want to use these utilities, but are noticing poor system-wide

performance due to the size of the backup, are encouraged to back up their systems in multiple smaller

sessions, rather than attempting to back up the entire system at one time. However, if the entire backup

must be done with a single session, the user may encounter an error in frecover if there is not enough

virtual memory available. If this happens, the user might consider adjusting the maxdsiz parameter or

the swap space; both of these require a reboot.

Note that when recovering ﬁles with access control lists, the ACL entries are stored on the backup as user

and an error is printed. In order to fully recover ﬁles backed up with ACLs, the password ﬁle

(

/etc/passwd) must be recovered before attempting to recover any desired ACLs.

Network special ﬁles are obsolete. Therefore,

frecover cannot restore these ﬁles. A warning message

is issued if an attempt is made to recover a network special ﬁle, and the ﬁle is skipped.

Care should be taken to match the names speciﬁed by the include and exclude options with the names in

the index on the tape. Since the ﬁles are stored on the backup in lexographic order as deﬁned by the

LANG or LC_COLLATE environment variable, frecover uses the exact path names to determine when

a partial recovery is complete, and when an earlier tape needs to be loaded. If a user’s speciﬁcation of a

ﬁle to be recovered is misspelled, this may cause confusing messages, such as frecover asking for the

previous volume, when volume one is mounted.

DEPENDENCIES

frecover does not support QIC-120 and QIC-150 formats on QIC devices. If frecover is attempted

for these formats, frecover fails and the following message is displayed :

mt lu X:Read must be a multiple of 512 bytes in QIC 120 and QIC 150

AUTHOR

frecover was developed by HP.

FILES

/dev/rmt/0m Default backup device.

/dev/rtape/tape1_BEST

Default backup device if legacy DSF is disabled.