leila.mutevelic@rss.rockwell.com writes:

Is it true that when one HD goes bad, it will be reconstructed on the hotspare, but if you don't pull out bad HD and replace it within the 24 hours system will shutdown?

No, it's not true.

What happens in a case if you have 2 hotspare?

If your system has run out of spares and a disk fails, it will be in degraded mode until you replace one or more spares. If an additional disk fails while in degraded mode, you are hosed.

Having two spares helps protect you from a second disk failure, as long as that second failure happens after the first reconstruction has finished.

However, even with two hot spares, I would recommend replacing replacing failed disks with new spares as soon as possible.

- Dan