The __DIRECT_IO_TEST__ file used by sanlock is triggering self heal activity upon DC start up and vm start/shutdown cycles, and whenever probes are made to the glusterfs volume.

Solution In Progress - Updated -

Issue

An issue is seen where the SANLOCK seems to cause a split brain between two replicate nodes in a gluster distributed replica volume.

Steps to Reproduce:
1. Create replicated distributed volume on gluster
2. Utilize the volume as a RHEV/oVirt storage volume
3. Start/stop a VM with a image stored on this volume.

Actual results:
sanlock triggers a self heal on test __DIRECT_IO_TEST___ file

Environment

glusterfs 3.1.*

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