Raid rebuild times

To hold my libary material and keep a backup of current projects I have a Drobo Pro, 8 Hdd storage unit. It's not fast but very flexible in the way it uses the hdds. I have it set up to cope with two drive failures. I was backing up over night when one drive failed, this unfortunately made the unit go off line (iscsi connection). The only way to get the Drobo online again is to reboot it but it is now in the raid rebuilding mode and can't be reset. Talking to Drobo this rebuild can take between 24 and 48 hours per TB, I have 15 TB of material so we are looking at up to a month before I can reboot. Is this a normal amount of time for a raid rebuild to take. I know the Drobo is unusual in the way it uses Raid 5, they call it beyond raid, but a month without my storage seems ridiculous.

Richard,
Your situation sounds frustrating and the Drobo Pro sounds slooooowwww!
The RAID 5 build times using an Areca ARC-1880ix-12 card 10x3TB was 7 hours + 35 minutes, or about 15 minutes/TB; quite a bit faster than 24 to 48 hrs/TB. Areca and their competitors also allow for the RAID to continued to be used during operation (reads/writes) although at a reduced performance speed.
I know it would be really painful to cut over to a controller card backup system with hot-swap drives or an external cable connected box (Sans Digital, etc.), but you may want to start dreaming / planning in that direction.
Sorry for your pain on this one.
Regards,
Jim

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    Message was edited by: Pondini

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