> > root@raidtest:~# cat /proc/mdstat > > Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] > > [raid4] [raid10] > > md0 : active raid5 vdf[5](S) vde[4](S) vdd[3] vdc[1] vdb[0] > > 4191232 blocks super 1.2 level 5, 512k chunk, algorithm 2 > > [3/3] [UUU] > > Where did vde & vdf spring from? They weren't in your create command - > did you add those as spares later? Yes > > > Does this mean the raid-5 is actually initiated as a raid-4? > > > RAID-5 is always created with n-1 disks, with the final disk being > recovered afterwards. It's quicker to do a linear read from the other > disks and a linear write onto the final disk (creating parity or > rebuilding the data as needed) than it is to intersperse reads & > writes > on all disks and just create the parity data (for RAID5 anyway - > reconstructing the data on a RAID6 from P & Q parity is far more > expensive, so it's quicker to just generate the parity there). ok, so do I understand correctly that the initial raid-5 build only writes data/parity to a single drive (the 'replacement')? Doing some more testing now to see what I can find… Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 roy@xxxxxxxxxxxxx http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
