[ale] Restore DVD

[Robert L. Harris]

What happens if you change from -j9 to -j6 ?  I've seen significant time
increases on large bzip's when I change the default compression level.



Thus spake Christopher Fowler (cfowler at outpostsentinel.com):

> I'm creating a restore DVD and it is taking a very long time to restore
> the data.  It takes longer to restore than it did to install the system.
> 
> I'm using dump/restore to do the archival and restoration.  When I do
> create the backup I am creating it with the option '-j9'.  This adds the
> highest level ob bzip2 compression.  I am not concerned with the
> resources that takes since the system is a 3.0P4 with 1mb cache.  It has
> plenty of horsepower to do the restoration.
> 
> What  I can not figure out is why it is taking so long.
> 
> Here is the data:
> 
> #1 Restore DVD
> 
> 12x CD-RW used for testing and not wasting blank CD-Rs
> 
> 
> #2 disk usage and size after restore
> 
> Filesystem                Size      Used Available Use% Mounted on
> /dev/root.old           891.0k    387.0k    504.0k  43% /initrd
> /dev/hdc                651.2M    651.2M         0 100% /initrd/cd
> /dev/loop0               89.7M     89.7M         0 100% /
> none                    501.5M      3.3M    498.2M   1% /mnt/rw
> /dev/md0                180.0G      1.6G    169.1G   1% /mnt/rw/tmp/md0
> 
> I'm only restoring 1.6G of stuff
> 
> 
> #3 Time it took to do resotre:
> 
> *************************************************
> * Restoration Complete!                         *
> *************************************************
> Restoration took 15903 seconds
> 
> That is a very long time
> 
> #4 Script used
> #!/bin/sh
> 
> echo "*************************************************"
> echo "* Restore System to Factory Defaults            *"
> echo "*************************************************"
> echo -n "Are you sure (y/n): "
> read ans
> if [ $ans != 'y' ]
> then
>         exit 0
> fi
> 
> START=`date +%s`
> 
> raidstop --configfile /data/raidtab /dev/md0 2>/dev/null 1>/dev/null
> echo "Blanking /dev/hda"
> dd if=/dev/zero of=/dev/hda1 bs=1024k count=100
> dd if=/dev/zero of=/dev/hda2 bs=1024k count=100
> dd if=/dev/zero of=/dev/hda bs=1024k count=5
> echo "Blanking /dev/hdb"
> dd if=/dev/zero of=/dev/hdb1 bs=1024k count=100
> dd if=/dev/zero of=/dev/hdb2 bs=1024k count=100
> echo "Creating partitions on /dev/hda"
> sfdisk /dev/hda < /data/hda.out || exit 1
> echo "Creating partitions on /dev/hdb"
> sfdisk /dev/hdb < /data/hdb.out || exit 2
> echo "Creating swap on /dev/hda2"
> mkswap -v1 /dev/hda2 || exit 2
> echo "Creating swap on /dev/hdb2"
> mkswap -v1 /dev/hda2 || exit 2
> echo "Turning RAID1 on /dev/md0"
> mkraid --configfile /data/raidtab --really-force /dev/md0 || exit 3
> echo "Creating FS"
> mke2fs -j -i 4096 /dev/md0 || exit 4
> echo "Mounting FS"
> mkdir /tmp/md0 || exit 5
> mount -t ext3 /dev/md0 /tmp/md0 || exit 6
> echo "Restoring files (this may take a while)...."
> cd /tmp/md0
> restore -rvf /data/dump.out
> mkdir proc
> mkdir sys
> cd /
> echo "Restoring GRUB."      
> grub --batch < /data/grub.conf
> STOP=`date +%s`
> TTIME=`expr $STOP - $START`
> echo ""
> echo "*************************************************"
> echo "* Restoration Complete!                         *"
> echo "*************************************************"
> echo "Restoration took $TTIME seconds"
> 
> 
> Should I skip restore and use tar?
> 
> 
> 
> 
> 
> _______________________________________________
> Ale mailing list
> Ale at ale.org
> http://www.ale.org/mailman/listinfo/ale

:wq!
---------------------------------------------------------------------------
Robert L. Harris                     | GPG Key ID: E344DA3B
                                         @ x-hkp://pgp.mit.edu
DISCLAIMER:
      These are MY OPINIONS             With Dreams To Be A King,
       ALONE.  I speak for              First One Should Be A Man
       no-one else.                       - Manowar

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