> Phil Turmel writes: > >> No, rebuild isn't just writing to the new disk. You have to read other >> disks to get the data to write. In raid6, you must read at least n-2 >> drives, compute, then write. In raid10, you just read the other drive >> (or one of the other drives when copies>2), then write. > > Yes, but the data is striped across those multiple disks, so reading > them in parallel takes no more time. At least unless you have a > memory/bus bottleneck rather than a disk bottleneck. so again, you're > probably right if you are using blazing fast NVME drives, but not for > conventional HDD. RAID10 is like RAID1+0, only a bit more fancy. That means it's basically striping across mirrors. It's *not* like RAID0+1, which is the other way, when you mirror two RAID0 sets. So when a drive dies in a RAID10, you'll have to read from one or two other drives, depending on redundancy and the number of drives (odd or even). Vennlig hilsen roy -- Roy Sigurd Karlsbakk (+47) 98013356 http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- Hið góða skaltu í stein höggva, hið illa í snjó rita.
