On 2016-09-01 08:57, Ronan Arraes Jardim Chagas wrote:
Hi!
Em Qua, 2016-08-31 às 17:09 -0600, Chris Murphy escreveu:
OK so Ronan, I'm gonna guess the simplest work around for your
problem
is to disable quota support, and see if the problem happens again.
Look at the output of the command proposed by Jeff:
btrfs qgroup show /
qgroupid rfer excl
-------- ---- ----
0/5 16.00KiB 16.00KiB
0/257 16.00KiB 16.00KiB
0/258 16.30MiB 16.30MiB
0/259 11.65GiB 309.67MiB
0/260 2.34MiB 2.34MiB
0/261 16.00KiB 16.00KiB
0/262 13.19GiB 13.19GiB
0/263 16.00KiB 16.00KiB
0/264 60.00KiB 60.00KiB
0/265 480.00KiB 480.00KiB
0/266 16.00KiB 16.00KiB
0/267 2.00GiB 2.00GiB
0/268 16.00KiB 16.00KiB
0/269 16.00KiB 16.00KiB
0/270 16.00KiB 16.00KiB
0/271 16.00KiB 16.00KiB
0/272 16.00KiB 16.00KiB
0/273 16.00KiB 16.00KiB
0/274 16.00KiB 16.00KiB
0/275 205.78MiB 205.78MiB
0/276 16.00KiB 16.00KiB
0/277 48.00KiB 48.00KiB
0/278 328.41MiB 328.41MiB
0/283 3.92GiB 26.63MiB
0/285 3.93GiB 4.10MiB
0/294 7.84GiB 100.59MiB
0/330 7.98GiB 6.61MiB
0/332 8.32GiB 69.17MiB
0/353 9.53GiB 49.46MiB
0/355 10.51GiB 235.39MiB
0/415 11.54GiB 3.38MiB
0/416 11.54GiB 896.00KiB
0/417 11.57GiB 2.68MiB
0/418 11.57GiB 160.00KiB
0/419 11.54GiB 2.40MiB
0/420 11.54GiB 192.00KiB
0/421 11.62GiB 4.61MiB
0/422 11.83GiB 212.93MiB
0/427 11.64GiB 1.27MiB
0/428 11.65GiB 4.25MiB
1/0 16.11GiB 4.77GiB
255/262 13.19GiB 13.19GiB
This system was installed with Tumbleweed ISO and I did not change
anything in btrfs options. Hence, it seems that openSUSE is enabling
quotas by default. Now, I need to disable it and avoid triggering the
problem. What is the best way I can do this? Is it OK to do just:
btrfs quota disable /
? Or do I need to format and recreate btrfs without quotas?
Yes, you can just run `btrfs quota disable /` and it should work. This
ironically reiterates that one of the bigger problems with BTRFS is that
distros are enabling unstable and known broken features by default on
install. I was pretty much dumbfounded when I first learned that
OpenSUSE is enabling BTRFS qgroups by default since they are known to
not work reliably and cause all kinds of issues.
If it doesn't happen again then it sounds like the reproduce steps
are:
a. enable quota support
b. do something metadata heavy workload that's also maybe hitting
fsync; from opensuse list the example that sometimes causes it:
osc co home:Ronis_BR/julia
cd home:Ronis_BR/julia
osc build --root=`pwd`/jail openSUSE_Tumbleweed x86_64
I wonder if it's easier to hit it on a hard drive, slower fsyncs?
This sounds good! Actually, I'm using a 7200RPM hard driver.
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