Dear list, After upgrading to 12.2.11 the MDSes are reporting slow metadata IOs (MDS_SLOW_METADATA_IO). The metadata IOs would have been blocked for more that 5 seconds. We have one active, and one active standby MDS. All storage on SSD (Samsung PM863a / Intel DC4500). No other (OSD) slow ops reported. The MDSes are underutilized, only a handful of active clients and almost no load (fast hexacore CPU, 256 GB RAM, 20 Gb/s network). The cluster is also far from busy.
I've dumped ops in flight on the MDSes but all ops that are printed are finished in a split second (duration: 0.000152), flag_point": "acquired locks". I've googled for "MDS_SLOW_METADATA_IO" but no useful info whatsoever. Are we the only ones getting these slow metadata IOS? Any hints on how to proceed to debug this are welcome. Thanks, Stefan -- | BIT BV http://www.bit.nl/ Kamer van Koophandel 09090351 | GPG: 0xD14839C6 +31 318 648 688 / [email protected] _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
