Re: deduplicating file systems: VDO with Debian?
Curt (12022-11-10):
> Maybe it's a question of intent more than anything else. I thought RAID
> was intended for a server scenario where if a disk fails, you're down
> time is virtually null, whereas as a backup is intended to prevent data
> loss.
Maybe just use common sense. RAID means your data is present on several
drives. You can just deduce what it can help for:
one drive fails → you can replace it immediately, no downtime
one drive fails → the data is present elsewhere, no data loss
several¹ drive fail → downtime and data loss²
1: depending on RAID level
2: or not if you have backups too
> RAID isn't ideal for the latter because it doesn't ship the saved
> data off-site from the original data (or maybe a RAID array is
> conceivable over a network and a distance?).
It is always a matter of compromise. You cannot duplicate your data
off-site at the same rate as you duplicate it on a second local drive.
That means your off-site data will survive an EMP, but you will lose
minutes / hours / days of data prior to the EMP. OTOH, RAID will not
survive an EMP, but it will prevent all data loss caused by isolated
hardware failure.
--
Nicolas George
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