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:gfarnum@xxxxxxxxxx] Sent: Wednesday, October 12, 2016 2:11 AM To: Davie De Smet <davie.desmet@xxxxxxxxxxxx> Cc: Mykola Dvornik <mykola.dvornik@xxxxxxxxx>; John Spray <jspray@xxxxxxxxxx>; ceph-users <ceph-users@xxxxxxxx> Subject: Re: CephFS: No space left on device On Tue, Oct 11, 2016 at 12:20 AM, Davie De Smet <davie.desmet@xxxxxxxxxxxx> 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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