This week Facebook should have completed its new photo storage system which is designed to reduce the social network’s reliance on expensive proprietary solutions from NetApp and Akamai. The new large blob storage system, named Haystack, is a custom-built file system solution for the over 850 [...]

When one of the disks failed in Dell MD1000, the hotspare disk will change its role into online mode, and you need to replace  the bad disk with a good one. So a question comes, how can I set the new disk into hotspare mode.