software raid on removable drives for backups

[Matthew Carpenter]

I believe this can be done, although if you do it live, you may have to use 
the mdadm commands.

On this same topic, I ran across a great article on doing SWRAID with Linux in 
SysAdmin magazine (wow, what a mag!)

http://www.samag.com/documents/s=9102/sam0404a/0404a.htm

And while searching for it, I ran across this one from LinuxDevCenter:

http://www.linuxdevcenter.com/pub/a/linux/2002/12/05/RAID.html


On Tuesday 01 February 2005 04:30 pm, 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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