InfoScale™ 9.0 Release Notes - AIX
- Introduction and product requirements
- Changes introduced in this release
- Fixed issues
- Limitations
- Storage Foundation software limitations
- Dynamic Multi-Pathing software limitations
- InfoScale Volume Manager software limitations
- File System (VxFS) software limitations
- SmartIO software limitations
- Replication software limitations
- Cluster Server software limitations
- Limitations related to bundled agents
- Limitations related to VCS engine
- Limitations related to the VCS database agents
- Virtualizing shared storage using VIO servers and client partitions
- Cluster Manager (Java console) limitations
- Limitations related to LLT
- Limitations related to I/O fencing
- Limitations related to bundled agents
- Storage Foundation Cluster File System High Availability software limitations
- Storage Foundation for Oracle RAC software limitations
- Storage Foundation for Databases (SFDB) tools software limitations
- Storage Foundation software limitations
- Known issues
- Issues related to installation, licensing, upgrade, and uninstallation
- Storage Foundation known issues
- Dynamic Multi-Pathing known issues
- InfoScale Volume Manager known issues
- File System (VxFS) known issues
- Dynamic Multi-Pathing known issues
- Replication known issues
- Cluster Server known issues
- Operational issues for VCS
- Issues related to the VCS engine
- Issues related to the bundled agents
- Issues related to the VCS database agents
- Issues related to the agent framework
- Cluster Server agents for Volume Replicator known issues
- Issues related to Intelligent Monitoring Framework (IMF)
- Issues related to global clusters
- Issues related to the Cluster Manager (Java Console)
- LLT known issues
- I/O fencing known issues
- Storage Foundation and High Availability known issues
- Storage Foundation Cluster File System High Availability known issues
- Storage Foundation for Oracle RAC known issues
- Oracle RAC known issues
- Storage Foundation Oracle RAC issues
- Storage Foundation for Databases (SFDB) tools known issues
- Issues related to installation, licensing, upgrade, and uninstallation
Limitation with RDAC driver and FAStT array for coordinator disks that use raw disks
For multi-pathing to connected storage, AIX uses the RDAC driver for FAStT arrays. Since it is an active/passive array, only the current active path is exposed to clients. The I/O fencing driver, vxfen, can use only a single active path and has no foreknowledge of the passive paths to the coordinator disks on an array. If the single active path fails, all nodes in the cluster lose access to the coordinator disks.
The loss of the path to the coordinator disks can potentially go unnoticed until a reboot, split brain, or any other reason that leads to a cluster membership change occurs. In any of these conditions, the cluster cannot form, and all nodes panic to prevent data corruption. No data loss occurs.
Workaround: Use DMP and specify paths to coordinator disks as DMP paths rather than raw disks to avoid this limitation.