W dniu 21.08.2012 12:44, David Brown pisze:
On 21/08/2012 12:41, Sergiusz Brzeziński wrote:
Hi,
I use Raid1 to make backup of the whole system.
Raid is not a backup system. It is to improve uptimes, minimise downtimes due to
disk failures, and possibly to improve disk speed and/or capacity.
I would recommend you first think about what you are trying to achieve here -
what are you trying to back up, how do you see restores being used, how
efficiently are you using your hardware, your bandwidth, your time and effort?
You would probably be better off with a normal fixed 2-disk raid1 to minimise
the problems caused by a single disk failure, combined with an rsync snapshot
style backup that can be fully automated and give quick and easy recovery of
multiple old versions of files in the face of the most common cause of data loss
- human error.
[...]
I know, I know. Raid is not a backup system :)
Or better: it is not intended to be a backup system.
But I do use Raid1 as backup solution because I don't know another backup
solution giving me together:
- so simple configuration (there is no configuration!)
- so low cost (no software cost, only hdd cost)
- complete copy of the whole system (not only data but also configuration)
- so quick start in case of hardware failure
- so fast backup process without excessive system load
- so simple handling (just remove and insert hdd with hot-swap bay)
With some more rotating disks it can simulate very good backup solutions and I
still can make backups of critical data (dumping databases, copying files)
independently of Raid (and I do it).
And even I You don't want using it as a regular backup it is alwas worth to do a
bootable disk with mirrored system partition and keep it somewhere out of the
box for the bad times - just a small system backup for quick start in case of
hardware failure.
So, maybye Raid 1 is not a backup system but for some cases this is the best
backup solution it can be! And I am an opportunist :)
Sergiusz
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