Op 25 okt. 2017 03:53 schreef "L. Rose" <li...@lrose.de>: Hi everyone,
I want to setup a couple of drives using RAID10 with mdadm. On top of /dev/md0, I want to setup one large dmcrypt/LUKS encrypted ext4 volume. As Arch wiki reads, this seems to be possible. But what about expanding that volume later on? RAID#Format_the_RAID_Filesystem recommends calculating the stripe_width value for ext4 based on the number of data disks[0]. When adding a new disk, the number of data disks would increase by one, and expanding both the dmcrypt/LUKS and the ext4 layer should be possible - but what about the stripe width_value? Does it need to be updated? Should it be updated? Is it possible to update the stripe_width value afterwards? [...] [0]: https://wiki.archlinux.org/index.php/RAID#Example_3._RAID10.2Cfar2 Regarding the (md)stripe_width: with the F2 layout, you can just add a 3rd drive without worry. Take a *good* look at the Linux MD Raid documentation (not just the ArchWiki) and you'll see that F2 always uses *blocks* in pairs, not disks. That is a major difference between software RAID and hardware Raid. Mvg, Guus Snijders
