Thanks, that makes a lot of sense. One more question about checksumming objects in rados. Our cluster uses two copies per object, and I have some where the checkums mismatch between the two copies (that deep scrub warns about). Does ceph store an authoritative checksum of what the block should look like? I.e. Is there a way to tell which version of the block is correct? I seem to recall some changelog entry that Hammer is adding checksum storage for blocks, or am I wrong?
Andras On 9/29/15, 9:58 AM, "Gregory Farnum" <[email protected]> wrote: >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 ><[email protected]> 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" <[email protected]> wrote: >> >>>On Mon, Sep 28, 2015 at 9:46 PM, Andras Pataki >>><[email protected]> 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 >>>> [email protected] >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>> >> >> _______________________________________________ >> ceph-users mailing list >> [email protected] >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
