On 02/08/2014 01:36 PM, John Navitsky wrote:
Hello,
I have a large file system that has been growing. We've resized it a
couple of times with the following approach:
lvextend -L +800G /dev/raid/virtual_machines
btrfs filesystem resize +800G /vms
I think the FS started out at 200G, we increased it by 200GB a time or
two, then by 800GB and everything worked fine.
The filesystem hosts a number of virtual machines so the file system is
in use, although the VMs individually tend not to be overly active.
VMs tend to be in subvolumes, and some of those subvolumes have snapshots.
This time, I increased it by another 800GB, and it it has hung for many
hours (over night) with flush-btrfs-4 near 100% cpu all that time.
I'm not clear at this point that it will finish or where to go from here.
Any pointers would be much appreciated.
Thanks,
-john (newbie to BTRFS)
-------- procedure log ----------
romulus:/home/users/johnn # lvextend -L +800G /dev/raid/virtual_machines
romulus:/home/users/johnn # btrfs filesystem resize +800G /vms
Resize '/vms' of '+800G'
[hangs]
top - 12:21:53 up 136 days, 2:45, 13 users, load average: 30.39,
30.37, 30.37
Tasks: 1 total, 1 running, 0 sleeping, 0 stopped, 0 zombie
%Cpu(s): 2.4 us, 2.3 sy, 0.0 ni, 95.1 id, 0.1 wa, 0.0 hi, 0.0 si,
0.0 st
MiB Mem: 129147 total, 127427 used, 1720 free, 264 buffers
MiB Swap: 262143 total, 661 used, 261482 free, 93666 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
48809 root 20 0 0 0 0 R 99.3 0.0 1449:14
flush-btrfs-4
------- misc info -----------
romulus:/home/users/johnn # cat /etc/SuSE-release
openSUSE 12.3 (x86_64)
VERSION = 12.3
CODENAME = Dartmouth
romulus:/home/users/johnn # uname -a
Linux romulus.us.redacted.com 3.7.10-1.16-desktop #1 SMP PREEMPT Fri May
31 20:21:23 UTC 2013 (97c14ba) x86_64 x86_64 x86_64 GNU/Linux
romulus:/home/users/johnn #
Found your problem! Basically if you are going to run btrfs you should
at the very least keep up with the stable kernels. 3.11.whatever is
fine, 3.12.whatever is better. Thanks,
Josef
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