I have written a tool that fixes this type of error. I'm currently
testing it. Will push it out tomorrow

Yan, Zheng

On Wed, Oct 12, 2016 at 9:18 PM, Davie De Smet
<davie.des...@nomadesk.com> wrote:
> Hi Gregory,
> Thanks for the help! I've been looping over all trashcan files and the amount 
> of strays is lowering. This is going to take quite some time as it are a lot 
> of files but so far so good. If I should encounter any further problems 
> regarding this topic, I'll give this thread a heads up.
> Kind regards,
> Davie De Smet
> Director Technical Operations and Customer Services, Nomadesk
> +32 9 240 10 31 (Office)
> -----Original Message-----
> From: Gregory Farnum [mailto:gfar...@redhat.com]
> Sent: Wednesday, October 12, 2016 2:11 AM
> To: Davie De Smet <davie.des...@nomadesk.com>
> Cc: Mykola Dvornik <mykola.dvor...@gmail.com>; John Spray 
> <jsp...@redhat.com>; ceph-users <ceph-us...@ceph.com>
> Subject: Re: [ceph-users] CephFS: No space left on device
> On Tue, Oct 11, 2016 at 12:20 AM, Davie De Smet <davie.des...@nomadesk.com> 
> wrote:
>> Hi,
>> We do use hardlinks a lot. The application using the cluster has a build in 
>> 'trashcan' functionality based on hardlinks. Obviously, all removed files 
>> and hardlinks are not visible anymore on the CephFS mount itself. Can I 
>> manually remove the strays on the OSD's themselves?
> No, definitely not. At least part of the problem is:
> *) Ceph stores file metadata organized by its *path* location, not in a 
> separate on-disk inode data structure like local FSes do.
> *) When you hard link a file in CephFS, its "primary" location increments the 
> link counter and its "remote" location just records the inode number (and it 
> has to look up metadata later on-demand).
> *) When you unlink the primary link, the inode data gets moved into the stray 
> directory until one of the remote links comes calling.
>>Or do you mean that I'm required to do a small touch/write on all files that 
>>have not yet been deleted (this would be painfull as the cluster is 200TB+)?
> Luckily, it doesn't take quite that much work. It looks like just doing a 
> getattr on all the remote links in your system should do it.
> If it's just your trash can, "ls -l" on that directory will probably pull 
> them in. Or you could delete the whole trashcan folder (set of
> folders?) and they'll go away as well.
> -Greg
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