Neither operation should involve the monitor beyond retrieving the CRUSH map. The image directory is stored as an object within the pool (rbd_directory) and the image snapshot list is embedded in each image's header object. These values are stored as omap key/value pairs associated to the object, so they will be read via LevelDB or RocksDB (depending on your configuration) within the object's PG's OSD. -- Jason Dillaman ----- Original Message ----- > From: "Allen Liao" <aliao.svsgames@xxxxxxxxx> > To: ceph-users@xxxxxxxxxxxxxx > Sent: Monday, October 12, 2015 2:52:03 PM > Subject: How expensive are 'rbd ls' and 'rbd snap ls' calls? > How expensive are the calls to list the rbd images (rbd ls) and their > snapshots (rbd snap ls). Is the metatdata for what images and snapshots are > stored in ceph kept in memory on the MON (in which case the calls would be > cheap)? > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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