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Full Discussion: Why is restore slower than backup?
Operating Systems Solaris Why is restore slower than backup? Post 69440 by drake on Thursday 14th of April 2005 06:38:53 PM
Old 04-14-2005
Sounds like you did a sequential ufsdump - which is a lot faster than an interactive ufsrestore (Where the tape heads are jumping around more based on yor selection criteria (e.g add/extract)). During an Solaris interactive restore, you generally just select the file(s) you require restoring from the filesystem (e.g a config file like /etc/hosts), although you can just select (add) everything and carry on with the restore. (if you have selected a ufsrestore ivf, the verbose option will also slow things down)

For a simple clean backup, I usually take a complete UFS level 0 dump; something like this ...

to dump ...

mt -f /dev/rmt/0 rewind # rewind the tape
for i in `/ /var /opt /export/home /opt/{filesystem} /opt/{filesystem}`
do
ufsdump 0f /dev/rmt/0n $i
echo "Completed ufs dump level 0 of $i ... "
done
echo "backup completed ... "
mt -f /dev/rmt/0 rewind
mt -f /dev/rmt/0 offline # eject the tape

Then try restoring the whole filesystem as follows with a similar script/set of commands ...

use mt -f /dev/rmt/0 fsf or bsf to move to the markers on the tape and when your happy you have the correct filesystem, complete a ufsrestore 0f /dev/rmt/0n (no rewind) to your filesystem. Should be quicker?

If you want to be even more fancy (in terms of potentially dealing with less data to backup), you could take incremental backups, which means you will only have to backup data that has changed from the last ufsdump date. Restores can get a bit tricky and messy though.
 

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LEARN ABOUT DEBIAN

device_maps

device_maps(4)							   File Formats 						    device_maps(4)

NAME

       device_maps - device_maps file

SYNOPSIS

       /etc/security/device_maps

DESCRIPTION

       The  device_maps file contains access control information about each physical device. Each device is represented by a one line entry of the
       form:

       device-name : device-type : device-list :

       where

       device-name	       This is an arbitrary ASCII string naming the physical device. This field contains no embedded white space  or  non-
			       printable characters.

       device-type	       This is an arbitrary ASCII string naming the generic device type. This field identifies and groups together devices
			       of like type. This field contains no embedded white space or non-printable characters.

       device-list	       This is a list of the device special files associated with the physical device. This field  contains  valid  device
			       special file path names separated by white space.

       The device_maps file is an ASCII file that resides in the /etc/security directory.

       Lines in device_maps can end with a `' to continue an entry on the next line.

       Comments may also be included. A `#' makes a comment of all further text until the next NEWLINE not immediately preceded by a `'.

       Leading and trailing blanks are allowed in any of the fields.

       The device_maps file must be created by the system administrator before device allocation is enabled.

       This file is owned by root, with a group of sys, and a mode of 0644.

EXAMPLES

       Example 1: A sample device_maps file

       # scsi tape
       st1:
       rmt:
       /dev/rst21 /dev/nrst21 /dev/rst5 /dev/nrst5 /dev/rst13 
       /dev/nrst13 /dev/rst29 /dev/nrst29 /dev/rmt/1l /dev/rmt/1m 
       /dev/rmt/1 /dev/rmt/1h /dev/rmt/1u /dev/rmt/1ln /dev/rmt/1mn 
       /dev/rmt/1n /dev/rmt/1hn /dev/rmt/1un /dev/rmt/1b /dev/rmt/1bn:

FILES

       /etc/security/device_maps

SEE ALSO

       allocate(1), bsmconv(1M), deallocate(1), dminfo(1M), list_devices(1)

NOTES

       The  functionality  described  in  this man page is available only if the Basic Security Module (BSM) has been enabled. See bsmconv(1M) for
       more information.

SunOS 5.10							    16 Jan 2001 						    device_maps(4)
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