Re: osd dies / crahes directly after mkcephfs

[Stefan Priebe <s.priebe@profihost.ag>]

Am 15.06.2012 23:46, schrieb Sage Weil:
> On Fri, 15 Jun 2012, Stefan Priebe wrote:
>> Hi,
>>
>> i've seen several osd crashes on one of my machines directly after creating
>> the ceph fs.
>>
>> Attached is the osd log. I also have a core dump file. Do you need it?
>
> Also, are you mounting the ceph file system on the same node as the osd?
> This might be a sync(2)-induced deadlock.
No i use only rados / rbd and in this case i have never used the fs at 
all as it has happened directly after mkcephfs and -a start. So i didn't 
even had the chance.

> Putting a ceph fs mount on the same node as an osd is dicey in low memory
> situations.  On older glibcs and kernels without syncfs(2) support, it can
> easily deadlock.
Even this does not apply i have syncfs.

my send log shows: mount syncfs(2) syscall fully supported (by glibc and 
kernel)

Stefan