10.09.2017 23:17, Dmitrii Tcvetkov пишет: >>> Drive1 Drive2 Drive3 >>> X X >>> X X >>> X X >>> >>> Where X is a chunk of raid1 block group. >> >> But this table clearly shows that adding third drive increases free >> space by 50%. You need to reallocate data to actually make use of it, >> but it was done in this case. > > It increases it but I don't see how this space is in any way useful > unless data is in single profile. After full balance chunks will be > spread over 3 devices, how it helps in raid1 data profile case? > A1 A2 => A1 A2 - => A1 A2 B1 => A1 A2 B1 B1 B2 B1 B2 - - B2 - C1 B2 C2
It is raid1 profile on three disks fully utilizing them (assuming equal sizes of course). Where "raid1" means - each data block has two copies on different devices. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
