I'm recreating the raid on a old msa60. Would it check for bad disks when I create it? It is three msa60 enclosure with 12bay and 1TB each. I need around 24TB usable storage, what would the ideal raid for it? This is going to be used as a secondary backup and there will also be a tape library attach to it.
I'd use RAID 1+0, but you can make a more informed decision by referencing the Canonical RAID question here on Server Fault.
Can you explain what operating system will be in use, how the application needs to see the storage, and the type of host server you will be connecting to?
The biggest issue I see, without answering any of those questions, is that you may run into logical drive size limits. Old firmware versions of the Smart Array P800 controller, for instance, only allowed 2TB LUNS. You'll need to update your firmware to remove that limitation. Do you need to present a single 24TB volume to a single server?
Like ewwhite pointed out, you are having more problems with your storage system than you should.
A single volume should be avoided at all costs, as it forces you to create giant RAID groups. If possible, try to create 5 RAID6 volumes, each with 7 disks (which leaves you with one hot spare). This gives you 25TB of raw storage, which almost fits your requirement of 24TB usable storage.
This will be MUCH safer than creating one large RAID5 volume (double parity, plus 1/5 of the rebuild time).