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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 CENTOS

idevicebackup2

idevicebackup2(1)					      General Commands Manual						 idevicebackup2(1)

NAME

       idevicebackup2 - Create or restore backups for devices running iOS 4 or later.

SYNOPSIS

       idevicebackup2 [OPTIONS] CMD [CMDOPTIONS] DIRECTORY

DESCRIPTION

       Create or restore backup from the current or specified directory.

OPTIONS

       -u, --udid UDID
	      target specific device by its 40-digit device UDID.

       -s, --source UDID
	      use backup data from device specified by UDID.

       -i, --interactive
	      request passwords interactively on the command line.

       -d, --debug
	      enable communication debugging.

       -h, --help
	      prints usage information.

COMMANDS

       backup create backup for the device.

       restore
	      restore last backup to the device.

	    --system
	      restore system files, too.

	    --reboot
	      reboot the system when done.

	    --copy
	      create a copy of backup folder before restoring.

	    --settings
	      restore device settings from the backup.

	    --remove
	      remove items which are not being restored.

	    --password PWD
	      supply the password of the source backup.

       info   show details about last completed backup of device.

       list   list files of last completed backup in CSV format.

       encryption on|off [PWD]
	      enable or disable backup encryption.

       changepw [OLD NEW]
	      change backup password on target device.

AUTHORS

       Martin Szulecki

       Nikias Bassen

SEE ALSO

       idevicebackup(1)

																 idevicebackup2(1)
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