The formula for objects in a file is <ino in hex>.<object in
sequence>. So you'll have noticed they all look something like
12345.00000001, 12345.00000002, 12345.00000003, ...

So if you've got a particular inode and file size, you can generate a
list of all the possible objects in it. To find the object->OSD
mapping you'd need to run crush, by making use of the crushtool or
similar.
-Greg

On Tue, Sep 29, 2015 at 6:29 AM, Andras Pataki
<apat...@simonsfoundation.org> wrote:
> Thanks, that worked.  Is there a mapping in the other direction easily
> available, I.e. To find where all the 4MB pieces of a file are?
>
> On 9/28/15, 4:56 PM, "John Spray" <jsp...@redhat.com> wrote:
>
>>On Mon, Sep 28, 2015 at 9:46 PM, Andras Pataki
>><apat...@simonsfoundation.org> wrote:
>>> Hi,
>>>
>>> Is there a way to find out which radios objects a file in cephfs is
>>>mapped
>>> to from the command line?  Or vice versa, which file a particular radios
>>> object belongs to?
>>
>>The part of the object name before the period is the inode number (in
>>hex).
>>
>>John
>>
>>> Our ceph cluster has some inconsistencies/corruptions and I am trying to
>>> find out which files are impacted in cephfs.
>>>
>>> Thanks,
>>>
>>> Andras
>>>
>>>
>>>
>>> _______________________________________________
>>> ceph-users mailing list
>>> ceph-users@lists.ceph.com
>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>>
>
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