software raid on removable drives for backups

[Roger Oberholtzer]

Just curious why the RAID for a backup? Just to be sure it is good (a
damn good reason). Or is there some other factor?

On Tue, 2005-02-01 at 22:30, Jason Joines wrote:
>     I'd like to use sets of big removable drives as backup media.  
> Ideally, a 3 disk RAID-5 set would be built and a weekly backup written 
> to it.  Then, another 3 disk set would be stuck in .....  Only problem 
> is I would need to be able to non-destructively reinsert the first set 
> to get data off of it if a restore was needed.  Can software raid do this?
> 
>     For the past three years I'd been using an Adaptec 2400A ATA raid 
> card to do this.  Actually 2 cards.  One card had four 80 Gb drives in 
> RAID 5 and daily backups were written to it.  The other card had six 
> sets of four 80 Gb that were swapped in and out for weekly and monthly 
> backups.  It was much faster and cheaper than tape.  We recently needed 
> to upgrade our capacity so an Adaptec 2810SA card was purchased and the 
> same thing attempted with big SATA drives.  After many problems and 
> destroyed backups Adaptec just told me the card couldn't be used this 
> way and it shouldn't have worked on the 2400A either.
> 
> Jason Joines
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