RAID 5 rebuild time

[Blue Fox]

Having just been rudely awoken by my RAID card (have my card set up to send me text messages ), apparently one of the drives in RAID array has died...logs show read errors for the past few days and it seems the disk finally gave out. I don't wish to run in degraded mode as losing another drive would be rather detrimental. Just curious if anyone would know what kind of downtime I am looking at while the array is rebuilt. I have 12 500gb drives on an Areca 1130ML. Almost wish I had switched the array over to RAID 6, but now I'll need a newer card to do that as I've run out of ports.

 

[drizzt81]

That card surely supports online reconstruction. so no downtime, but degraded performance.

 

[-Dragon-]

Rebuild time ~ Individual Drive Capacity / ( Max Raid Throughput / (# Drives - 1))

Say 500GB / (200MB/s (for example) / 11) = 27500sec or about 7hrs 40mins

As the above said, it should support online rebuild which means you can still use it while rebuilding.

 

[Blue Fox]

Ah, well, it's going to be half that figure that you posted (time wise) then.