If you use a fully distributed storage system, like Ceph (or 3Par?), then rebuild times during a drive failure would be significantly lower. Also, any self-res

If you use a fully distributed storage system, like Ceph (or 3Par?), then rebuild times during a drive failure would be significantly lower. Also, any self-respecting storage system (RAID or not) will lower rebuild priority over normal IO. To give a specific example, let's say you have a 10-node Ceph cluster with 10 of these SSDs in each node filled up to 75% capacity. During a rebuild you throttle down to 50 MBps per SSD. After a single drive failure, the remaining 99 SSDs will work together to redistribute the data in about 40 minutes: $ python3 -c "print(round((15.36 * 1024 * 1024 *.75) / (50.0 * 99) / 60.0, 2))" 40.67 The 50 MBps per drive may seem like a low number, but that actually means each node has to move data at roughly 5 Gbps over the cluster network. * Edited to fix the python line where the multiplication characters converted to italics formatting.