"we obviously store data in mirrored mode on several servers" They then asked the provider to swap the disk. They had a RAID1; it's a common enough setup. SSD

"we obviously store data in mirrored mode on several servers" They then asked the provider to swap the disk. They had a RAID1; it's a common enough setup. SSDs fail in many of the the same ways as spinning disks, they just add a few more failure cases.