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Redundant RAID Controllers in One Chassis?

F

feffrey

Gawd
Joined
Oct 26, 2010
Messages
585
Can dual SAS expanders and Dual RAID controllers work this way?

SuperMicro Chassis (SC846E26-R1200B) with dual expanders and with SAS drives.
2x LSI 9270-8i (I'm not firm on the card at all, but it is compatible with the expander in the SM chassis.)
Expander 1 goes to controller 1
Expander 2 goes to controller 2

Both controllers are on same motherboard. There will be two arrays passed to windows. The first controller would be active; unless a failure occurred then it should switch over to 2nd raid card ideally.

I realize that if the mobo, CPU, or RAM decides to crap itself the server will be down, however those are the only points of hardware failure left, and I am more worried about a expander or controller failing.

Also I know RAID is not a backup. :)

This is potentially going to be a new backup server, and all the backups are going to be replicated to another backup server offsite. Previous backup server I built (currently the offsite one) used one Raid Controller, single port SM expander, and Sata discs, but for this new one I am wondering if I can eliminate a few points of hardware failure by having dual expanders, SAS drives and two controllers.
 
You would be far better served using cluster services with a heartbeat (with whatever OS you choose) for a redundant filesystem with 2 completely isolated systems. All it would take in a system such as you describe would be 1 bad power supply which could take out every drive (in both arrays) and everything else connected to it.
It is always nice to see that our constant pounding of "RAID is not a backup" is taking hold with some people :D
 
There are some HBA's that support configurations like that as well, multipath hbas? Not cheap but possible. I haven't used DFS but as I understand if you have multiple servers this does the same thing.

Would just be easier to have two servers doing zfs block level replications, i'd like to think.
 
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