Hello,
I'm testing btrfs on two 2TB drives with RAID1 on linux 3.9. So I have
virtually a space of 2TB.
I use iozone, bonnie++ and a lot of untaring linux kernel on fs to
load it and see what's happen.
After some hours, I got ENOSPC and some daemon start crashing. I read
wiki FAQ[1], and balance fix the issue (for few times). But running it
again issue come back.
The following is the output of untarnig linux kernel.
# while true; do for i in *.tar.xz; do d=${i%.tar.xz}; echo $d; [[ -e
"$d" ]] && rm -r "$d"; tar xf "$i"; done; done
...
tar: linux-3.3/arch/sh: Cannot mkdir: No space left on device
tar: linux-3.3/arch/sh/drivers/pci/fixups-sdk7786.c: Cannot open: No
such file or directory
tar: linux-3.3/arch/sh: Cannot mkdir: No space left on device
tar: linux-3.3/arch/sh/drivers/pci/fixups-se7751.c: Cannot open: No
such file or directory
tar: linux-3.3/arch/sh: Cannot mkdir: No space left on device
tar: linux-3.3/arch/sh/drivers/pci/fixups-sh03.c: Cannot open: No such
file or directory
# df
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 3,7T 122G 3,6T 4% /
# btrfs fi sh
Label: 'achille.root' uuid: 2ab5010c-e8fe-4b8a-a895-3e58552ed791
Total devices 2 FS bytes used 60.85GB
devid 1 size 1.82TB used 65.02GB path /dev/sda2
devid 2 size 1.82TB used 65.01GB path /dev/sdb2
Btrfs v0.20-rc1
The first time ENOSPC happen on my FS, the previous command show each
disk as full. Not like now (after the first run of "btrfs balance
start / -dusage=5").
# btrfs fi df /
Data, RAID1: total=61.00GB, used=59.99GB
System, RAID1: total=8.00MB, used=16.00KB
System: total=4.00MB, used=0.00
Metadata, RAID1: total=4.00GB, used=882.61MB
Metadata: total=8.00MB, used=0.00
The following page[2] suggest me to enable enospc_debug.
# mount -o remout,enospc_debug /
# mount -t btrfs /
/dev/sda2 on / type btrfs (rw,relatime,space_cache,enospc_debug)
But I see nothing in dmesg. Where I can find the debug messages?
So, I'm currently able to easily make the btrfs fs dirty without any
way of seeing if there is a ENOPSC in some directory.
[1] https://btrfs.wiki.kernel.org/index.php/FAQ#Help.21_Btrfs_claims_I.27m_out_of_space.2C_but_it_looks_like_I_should_have_lots_left.21
[2] https://btrfs.wiki.kernel.org/index.php/Mount_options
--
Sébastien "Seblu" Luttringer
https://www.seblu.net
GPG: 0x2072D77A
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