--mixed seems to prevent selection of alternative leaf/node/sector sizes:
$ sudo mkfs.btrfs --mixed -n 16384 -s 16384 -d single -m single /dev/mapper/ca-store
Created a data/metadata chunk of size 8388608
fs created label (null) on /dev/mapper/ca-store
nodesize 16384 leafsize 16384 sectorsize 16384 size 98.00MB
$ sudo mount /dev/mapper/ca-store /mnt
mount: /dev/mapper/ca-store already mounted or /mnt busy
Apr 6 17:59:36 s_all@ruthven kernel: [1842232.007361] device fsid 8ca4524f-4cd4-45a6-855b-dc14b56652e3 devid 1 transid 4 /dev/mapper/ca-store
Apr 6 17:59:36 s_all@ruthven kernel: [1842232.117266] btrfs: disk space caching is enabled
Apr 6 17:59:36 s_all@ruthven kernel: [1842232.117271] btrfs flagging fs with big metadata feature
Apr 6 17:59:36 s_all@ruthven kernel: [1842232.117657] btrfs: Incompatible sector size(16384) found on dm-10
Apr 6 17:59:36 s_all@ruthven kernel: [1842232.118023] btrfs: open_ctree failed
$ sudo mkfs.btrfs --mixed -n 16384 -l 16384 -d single -m single /dev/mapper/ca-store
Created a data/metadata chunk of size 8388608
fs created label (null) on /dev/mapper/ca-store
nodesize 16384 leafsize 16384 sectorsize 4096 size 98.00MB
$ sudo mount /dev/mapper/ca-store /mnt
mount: /dev/mapper/ca-store already mounted or /mnt busy
Apr 6 18:06:37 s_all@ruthven kernel: [1842652.655610] device fsid 70c12f3f-39af-41e2-afa5-8b807ae2e410 devid 1 transid 4 /dev/mapper/ca-store
Apr 6 18:06:37 s_all@ruthven kernel: [1842652.777797] btrfs: disk space caching is enabled
Apr 6 18:06:37 s_all@ruthven kernel: [1842652.777806] btrfs flagging fs with big metadata feature
Apr 6 18:06:37 s_all@ruthven kernel: [1842652.777812] btrfs: unequal leaf/node/sector sizes are not allowed for mixed block groups on dm-10
(It's not particularly important to me in this configuration -- I
can just use 4096, but I thought it should be published).
Hugo.
--
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
--- Computer Science is not about computers, any more than ---
astronomy is about telescopes.
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