btrfs szabad hely furcsasag raid10 -nel.

Formazzuk raid10 re.

gep$ time mkfs.btrfs -m raid10 -d raid10 /dev/sdb /dev/sdc /dev/sdd /dev/sde

WARNING! - Btrfs Btrfs v0.19 IS EXPERIMENTAL
WARNING! - see http://btrfs.wiki.kernel.org before using

failed to open /dev/btrfs-control skipping device registration
adding device /dev/sdc id 2
failed to open /dev/btrfs-control skipping device registration
adding device /dev/sdd id 3
failed to open /dev/btrfs-control skipping device registration
adding device /dev/sde id 4
failed to open /dev/btrfs-control skipping device registration
fs created label (null) on /dev/sdb
nodesize 4096 leafsize 4096 sectorsize 4096 size 5.46TB
Btrfs Btrfs v0.19

real 0m0.103s
user 0m0.000s
sys 0m0.010s

dd zuk, teli. 195Mb/sec -el ir a dev/zero -bol, 1 vinyo onmagaban blokk szinten kb. 99.5 MB/sec -el tud olvasni.
4 magos rendszeren kb. 30% CPU hasznalt merheto kozben, gondolom a sok crc32 szamitas miatt. Egyenlore csak az alap mount opcikkal probaltam.

gep ~ # btrfs-show
failed to read /dev/sr0
Label: none uuid: e4765bdd-ccb9-4a7b-b37f-16b3654874b7
Total devices 4 FS bytes used 2.73TB
devid 1 size 1.36TB used 1.36TB path /dev/sdb
devid 2 size 1.36TB used 1.36TB path /dev/sdc
devid 4 size 1.36TB used 1.36TB path /dev/sde
devid 3 size 1.36TB used 1.36TB path /dev/sdd

Btrfs Btrfs v0.19

gep ~ # df
Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 480624752 455714604 495768 100% /
/dev/root 480624752 455714604 495768 100% /
rc-svcdir 1024 124 900 13% /lib64/rc/init.d
udev 10240 300 9940 3% /dev
shm 4089636 76 4089560 1% /dev/shm
/dev/sdb 5860554336 2929510992 2931043344 50% /mnt/btrfs

Ami nekem furcsa, hogy a teli vinyon miert van 50% szabad hely ? Ugye raid 10 miatt minden ketszer van meg.
Eleg uj a cucc itt nalam, meg nem sokat tudok rola.