LifeKeeper for Windows supports three types of storage – all protected by the “volume” resource type.
- Fully mirrored volume (data is replicated from source node to all cluster nodes)
- Mixed mirrored / shared (volume is shared between some nodes, replicated to others)
- Shared volume (no replication)
All three types of volume require that SIOS DataKeeper be installed, along with LifeKeeper for Windows.
The first two volume types (Fully mirrored and Mixed mirrored / shared) require that you install a DataKeeper license. The DataKeeper license allows you to create mirrors to support the replicated nodes.
The third volume type (Shared volume with no replication) does not require a DataKeeper license. The DataKeeper service can recognize a valid LifeKeeper license, and will run in “shared volume” mode when one is found and no DataKeeper license is found. This allows LifeKeeper to take advantage of the I/O fencing capabilities provided by DataKeeper.