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No space left on device

DISCUSSION Gabor MICSKO 2 participants 2 messages Dec 8, 2008 Btrfs file system

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#0 lore raw

hi,

I have an 80GB external HDD with one btrfs partition. Latest kernel module and btrfs-progs from "unstable" git repos.

# mount
[...]
/dev/sdb1 on /media/coolermaster type btrfs (rw)
# df -h
[...]
/dev/sdb1              75G   61G   15G  81% /media/coolermaster

It seems like i have 15GB free space on the btrfs formatted partition, but when i try to create a file of 4GB on the btrfs filesystem i get the following error:

root@alderaan:/media/coolermaster/tmp# dd if=/dev/zero of=foobar.img
bs=1024 count=4000K
dd: writing `foobar.img': No space left on device
3372894+0 records in
3372893+0 records out
3453842432 bytes (3.5 GB) copied, 321.087 s, 10.8 MB/s

syslog:

Dec  8 10:35:46 alderaan kernel: [30716.434747] device fsid
46489b7e62f254e0-e306291dd7724d8f devid 1 transid 283 /dev/sdb1
Dec  8 10:35:50 alderaan kernel: [30720.457774] space info full 36

Am i missing something (e.g. reserved space for root, etc.) obvious here?

Thanks,

--
mg

#1 lore raw

El Mon, 08 Dec 2008 10:46:25 +0100, Gabor MICSKO <[email protected]= m> escribi=C3=B3:

Quoted 5 lines
# df -h
[...]
/dev/sdb1              75G   61G   15G  81% /media/coolermaster
=20
It seems like i have 15GB free space on the btrfs formatted partition=

,

Quoted 1 line

but when i try to create a file of 4GB on the btrfs filesystem i get =

the

Quoted 1 line

following error:

btrfs has an (artificial) limit of 85% of the space which won't be lift= ed until
the allocation code is mature. So you can't use the 100% for now...that --
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