Hi,
I planned to boost my btrfs performance today. here some errors I met:
my 'btrfs filesystem show' result:
~ # btrfs filesystem show
failed to read /dev/sr0
Label: none uuid: 9b9aa9d9-760e-445c-a0ab-68e102d9f02e
Total devices 1 FS bytes used 36.59GB
devid 1 size 49.52GB used 49.52GB path /dev/sda6
Label: none uuid: 559dec06-4fd0-47c1-97b8-cc4fa6153fa0
Total devices 1 FS bytes used 135.48GB
devid 1 size 293.56GB used 293.56GB path /dev/sda5
Btrfs v0.19+
my btrfs packages:
* kernel moudule: btrfs-git from mason's repo, 20121010
* btrfsprogs: 0.19
and my /etc/fstab:
UUID=9b9aa9d9-760e-445c-a0ab-68e102d9f02e / btrfs
defaults,compression=lzo,space_cache,io_cache,comment=systemd.automount
1 0
UUID=559dec06-4fd0-47c1-97b8-cc4fa6153fa0 /home btrfs
defaults,space_cache,comment=systemd.automount 1 0
my btrfs partitions are made in 2011.11, before kernel 3.2 is
released.( is that related? like the previous space_cache issue?)
1. I also added mount option 'compression=lzo' and 'io_cache' to /home at first.
then "cannot enter home directory. using ./" in KDE it shows the kdm
login(I used autologin, which should boot directly into the desktop)
and "call to lnusetemp failed.(temporary directories full?) check your
installtion" when I clicked okay.
I checked dmesg log, found it didn't recogonized my "compression=lzo" option:
[ 7.726768] device fsid 9b9aa9d9-760e-445c-a0ab-68e102d9f02e devid
1 transid 359535 /dev/sda6
[ 7.727555] btrfs: disk space caching is enabled
[ 9.260024] btrfs: unrecognized mount option 'compression=lzo'
and multiple:
[ 232.314220] device fsid 559dec06-4fd0-47c1-97b8-cc4fa6153fa0 devid
1 transid 523509 /dev/sda5
[ 232.314744] btrfs: unrecognized mount option 'compression=lzo'
[ 232.314816] btrfs: open_ctree failed
outputs.
so I removed them from /home. now I can boot. but it still complains:
btrfs: unrecognized mount option 'io_cache'
for /.
2. After I logged in, I switched to root:
~# umount -o remount,compression="lzo" /dev/sda5 /home
I thought it was mounted with compression enabled, (but actually its
not, before I reported here. I checked dmesg, there's an entry
4800.xxxxx which should be my second home mount, with unrecognized
compression=lzo either)
so I wanted to make all my existing files compressed. I googled, and
found a post on Ocale.com said:
~# btrfs filesystem -c
"The defragment command has an option -c that lets you specify zlib or
lzo". but it was not true according to:
http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg07563.html
Mason said -c only force compression. so how can I specify compression method?
what's more, defragment tool always returns:
~ # btrfs filesystem defragment -c /dev/sda5
ERROR: defrag range ioctl not supported in this kernel, please try
without any options.
total 1 failures
~ # btrfs filesystem defragment -c /home
failed to open /home
open:: No such device
total 1 failures
I'm confused. no solution found through google for the first message.
and if we can defragment a file like /home/marguerite/100m.zip, why
/home failed to open?
Thanks for help
Marguerite
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