Hi, some of our applications (e.g., backy) use 'rbd snap ls' quite often. I see regular occurrences of blocked requests on a headly loaded cluster which correspond to snap_list operations. Log file example: 2016-01-20 11:38:14.389325 osd.13 172.22.4.44:6803/13012 40529 : cluster [WRN] 1 slow requests, 1 included below; oldest blocked for > 15.098679 secs 2016-01-20 11:38:14.389336 osd.13 172.22.4.44:6803/13012 40530 : cluster [WRN] slow request 15.098679 seconds old, received at 2016-01-20 11:37:59.276665: osd_op(client.256532559.0:2041 rbd_data.c390a692ae8944a.000000000000057b@snapdir [list-snaps] 266.95976dde ack+read+known_if_redirected e807541) currently no flag points reached Does anyone know if 'rbd snap ls' creates locks? On which level are these locks created (volume, pool, global)? Would it be best to reduce the usage of 'rbd snap ls' on a heavly loaded cluster? TIA Christian -- Dipl-Inf. Christian Kauhaus <>< · kc@xxxxxxxxxxxxxxx · +49 345 219401-0 Flying Circus Internet Operations GmbH · http://flyingcircus.io Forsterstraße 29 · 06112 Halle (Saale) · Deutschland HR Stendal 21169 · Geschäftsführer: Christian Theune, Christian Zagrodnick _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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