NAME

restor − incremental file system restore

SYNOPSIS

restor key [ arguments ]

DESCRIPTION

Restor is used to read magnetic tapes dumped with the dump command.  The key specifies what is to be done.  Key is one of the characters rRxt, optionally combined with f. 

f Use the first argument as the name of the tape instead of the default. 

r or R The tape is read and loaded into the file system specified in argument. This should not be done lightly (see below). If the key is R, restor asks which tape of a multi-volume set to start on.  This allows restor to be interrupted and then restarted (an fsck must be done before the restart). 

x Each file on the tape named by an argument is extracted.  The file name has all “mount” prefixes removed; for example, if /usr is a mounted file system, /usr/bin/lpr is named /bin/lpr on the tape.  The extracted file is placed in a file with a numeric name supplied by restor (actually the inode number).  In order to keep the amount of tape read to a minimum, the following procedure is recommended:

1.  Mount volume 1 of the set of dump tapes. 

2.  Type the restor command. 

3.  Restor will announce whether or not it found the files, give the numeric name that it will assign to the file, and rewind the tape. 

4.  It then asks you to “mount the desired tape volume”.  Type the number of the volume you choose.  On a multi-volume dump the recommended procedure is to mount the last through the first volumes, in that order.  Restor checks to see if any of the requested files are on the mounted tape (or a later tape−thus the reverse order) and doesn’t read through the tape if no files are.  If you are working with a single-volume dump or if the number of files being restored is large, respond to the query with 1 and restor will read the tapes in sequential order. 

t Print the date the tape was written and the date the file system was dumped from. 

The r option should only be used to restore a complete dump tape onto a clear file system, or to restore an incremental dump tape onto a file system so created.  Thus:

/etc/mkfs /dev/rp0 40600
restor r /dev/rp0

is a typical sequence to restore a complete dump.  Another restor can be done to get an incremental dump in on top of this. 

A dump followed by a mkfs and a restor is used to change the size of a file system. 

FILES

default tape unit varies with installation
rst*

SEE ALSO

dump(1M), fsck(1M), mkfs(1M). 

DIAGNOSTICS

There are various diagnostics involved with reading the tape and writing the disk.  There are also diagnostics if the i-list or the free list of the file system is not large enough to hold the dump. 

If the dump extends over more than one tape, it may ask you to change tapes.  Reply with a new-line when the next tape has been mounted. 

BUGS

There is redundant information on the tape that could be used in case of tape reading problems.  Unfortunately, restor doesn’t use it. 

May 16, 1980  —  Obsolescent