AsyncMemberType indicates how the reporting async member purges mirror journal files received from the primary failover member.
0 - Mirror journal files are purged immediately after being dejournaled.
1- Mirror journal files are purged according to the instances journal file purge criteria.
For more information, see the Editing or Removing an Async Members section of the chapter “Mirroring” in the Cache High Availability Guide.
On the page System Administration > Configuration > Mirror Settings > Edit Async, for a reporting async member, use the Mirror Journal File Retention drop-down to determine how mirror journal files are purged.