Hello everbody!
I just felt like sharing a quite useful cronscript with you...
I've been running a company server for quite a while (actually, all the way from ESS&G 4.0), and it's running just wonderfully!
It's equipped with tho scsi host adapters, to each of them one attached 50 GB scsi drive (placed in a "Removable Drive Enclosure")
One of the discs is a "live disk", - the second one is just a "mirror disk".
(We also have several more "mirror disks" placed in the safe to switch between)
Every night, I run the following cron script:
(This version of the script comes from the old 4.1.2 server, but you'll probably catch the idea...)
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#!/bin/sh
echo 'scsi add-single-device 1 0 15 0' >/proc/scsi/scsi
mke2fs /dev/sdb6
mount /dev/sdb6 /mnt/sdb6
ls / | grep -v proc |grep -v boot |grep -v mnt |grep -v lost+found
>/root/mirror_files
(cd /;tar cf - cat /root/mirror_files)|(cd /mnt/sdb6;tar xvpf -)
mkdir /mnt/sdb6/mnt
mkdir /mnt/sdb6/mnt/sdb6
mkdir /mnt/sdb6/mnt/cdrom
mkdir /mnt/sdb6/mnt/floppy
mkdir /mnt/sdb6/proc
mkdir /mnt/sdb6/boot
umount /dev/sdb6
echo 'scsi remove-single-device 1 0 15 0' >/proc/scsi/scsi
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On the very old HW (P2 400MHz), this procedure takes about 1 hour to "mirror" something like 40 GB or so of data.
...As a result, every morning I have a complete "backup" of all the files in the system. When a user suddenly deletes an important file I can easily restore it from the "mirror" simply by copying back the file again.
Whenever I want, I can even switch the "mirror disk" to another "mirror disk", just like switching tapes in a tape recorder.
I realize this might not be the cheapest way of doing backups on a server, but it feels like the fastest...
If someone have any ideas of how to further improving the script above, I'd be very interested in sharing your thoughts.
Best regards:
Lasse
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