dan wrote:

> add a third member drive to your software raid so you have a 3 device 
> raid1.  setup a script for when you hotplug the drive to automatically 
> add it to the raid1 and another script to disconnect it from the raid(by 
> serial number or UUID or something unique to each disk).

Great idea,

if I understand it correctly, iSCSI will allow me to add a harddrive via 
TCP/IP to my RAID. Sounds nice, but as far as I can see (after a quick 
research) this will cost arround 700 Eur (ex: Allnet NAS RAID System 5x 
SATA - ALL6600 iSCSI)?

My idea is to use the harddrives we have available after we changed from 
backing to external harddrives to one backuppc server.

Questions:

1) Is is also possible to add a 3rd harddrive via USB or Firewire to the 
RAID1 and then using your idea to detach and reattach the harddrive?

2) When I attach the harddrive to my RAID 1, is md smart enough to just 
transfer the changes to the attached drive or will it make a full sync? 
(sorry for this newbie question)

 >  additionally, you can have an email sent
> to you when a rebuild completes, or even a text message so you know the 
> sync is done.

That sounds interesting, can you point me to a good place to start 
reading about how to implement this?

Thanks for your helpfull idea using the already available RAID1.

Best regards

- Kurt

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