[Ocfs2-users] OCFS2 KVM Crashes Yet Again !

[Changwei Ge]

Hi,

Could you please paste the crash back trace.

On 2017/9/27 16:15, netbsd at tango.lu wrote:
> Hello All,
> 
> I wrote earlier about our OCFS2 crash issue in KVM due to bug in the SMP
> code.
> 
> For this we come up with a solution:
> 
> Instead of using multiple vcpus
>     <vcpu placement='static'>8</vcpu>
> 
> using a single one and multiple cores instead:
>       <topology sockets='8' cores='8' threads='1'/>
> 
> And applying key tune options to sysctl.conf:
> 
> vm.min_free_kbytes=131072
> vm.zone_reclaim_mode=1
> 
> Seemed to be helped, the fs did not crash right away when we were
> hammering it with apache benchmarks with 10000 requests however last
> night I started a large rsync operation from a 5TB OCFS2 FS mounted in
> the VM to another OCFS2 mounted in the same VM and ended up with:
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__ibb.co_gFeGg5&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PQcxBKCX5YTpkKY057SbK10&r=QxGl6UoyzTJm_1fAz5ZR9izvWJhWcqbtYn-0afBpa7A&m=cYprGRHz-oQmhnx4HIke8sTdCG_tf8Jb-rF6sHnYLnk&s=ajWfQIlUZOpElFWxoKcmvTIk7J3PpuCJITcnXfJQHrc&e=
> 
> After trying a lot of different kernels starting from the 3.x series,
> now we are using 4.13.2 latest kernel with default configuration but
> these issues still present. Is this OCFS2 project still being developed?
I admit that the developing group is not active recently.

> With this crashing and unreliability it cannot be used in production
> unless you put in place bunch of safeguards to reset out the whole
> virtualmachine when it crashes.
> 
> Thanks
> 
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