Intermittent samba ctdb share timeouts due to "RECLOCK latency" on Red Hat Enterprise Linux 6
Issue
- High RECLOCK latency for ctdb re-lock file using gfs2 filesystem for shared storage.
- This issue seems to cause intermittent smb timeouts with client sessions.
- This is a CTDB setup and clients loose connectivity to samba shares with the following errors :
013/05/01 10:32:46.454123 [11077]: server/ctdb_recoverd.c:2632 check_reclock child process hung/timedout CFS slow to grant locks?
2013/05/01 10:32:46.454320 [11025]: High RECLOCK latency 15.002650s for operation recd reclock
Environment
- Red Hat Enterprise Linux Server 6 (with the High Availability and Resilient Storage Add Ons)
- Red Hat High Availability cluster with 2 or more nodes.
- Active/Active Samba configuration (CTDB)
- Multiple clients connect to the same Samba shares
- GFS2 file systems
- Samba ctdb database is stored on one of the GFS2 filesystems. This is the filesystem having issues.
- Another GFS2 filesystem holds shared data.
- GFS2 fileystem is also shared via NFS (NOTE: Mixing Samba and NFS sharing of the same GFS2 filesystem is unsupported).
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