I created a btrfs RAID-10 array across 4-drives,
mkfs.btrfs -L TEST -m raid10 -d raid10 /dev/sda /dev/sdb /dev/sdc /dev/sdd
btrfs-show
Label: TEST uuid: 2ac85206-2d88-47d7-a1e7-a93d80b199f8
Total devices 4 FS bytes used 28.00KB
devid 1 size 931.51GB used 2.03GB path /dev/sda
devid 2 size 931.51GB used 2.01GB path /dev/sdb
devid 4 size 931.51GB used 2.01GB path /dev/sdd
devid 3 size 931.51GB used 2.01GB path /dev/sdc
@ mount,
mount /dev/sda /mnt
df -H | grep /dev/sda
/dev/sda 4.1T 29k 4.1T 1% /mnt
for RAID-10 across 4-drives, shouldn't the reported/available size be
1/2x4TB ~ 2TB?
e.g., using mdadm to build a RAID-10 array across the same drives,
mdadm -v --create /dev/md0 --level=raid10 --raid-devices=4 /dev/sd[abcd]1
pvcreate /dev/md0
pvs
PV VG Fmt Attr PSize PFree
/dev/md0 lvm2 -- 1.82T 1.82T
is the difference in available array space real, an artifact, or a
misunderstanding on my part?
thanks.
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