March 2013 Dell EqualLogic Configuration Guide v14.1 6-49
Table 21 Firmware replication compatibility
Firmware of “Local” Group
Firmware on Replication Partner
V5.1.x, V5.2.x V5.0.x, V5.1.x, V5.2.x
V4.2.x, V4.3.x, V5.0.x, V5.1.x, V5.2.x
V4.1.x, V4.2.x, V4.3.x, V5.0.x
V4.0.x, V4.1.x, V4.2.x, 4.3.x
V3.2.x, V3.3.x, V4.0.x, V4.1.x, V4.2.x
V3.0.x, V3.1.x, V3.2.x, V3.3.x, V4.0.x
V3.0.x, V3.1.x, V3.2.x, V3.3.x
6.1.8 Clustering
To support a shared storage environment, EqualLogic allows concurrent access to any volume.
Concurrent volume access is enabled on a per volume basis within the Group Manager or via CLI. The
EqualLogic array will not manage concurrent access to these volumes. Control of access to a shared
volume must be provided by means of access control software on each host that has access to the
volume.
Warning: Failure to provide access control to a shared volume can result in data loss.
By default, EqualLogic PS Series groups disable multi-host (shared) access to target.
• If needed, you can enable multi-host access for a volume.
• If you enable multi-host access to a volume, then proper I/O operation concurrency must be
maintained.
6.2 Synchronous replication
6.2.1 About Synchronous replication
Synchronous replication (SyncRep) is the simultaneous writing of volume data across two different
storage pools in the same PS Series group, resulting in two hardware-independent copies of volume
data. Each write must go to both pools before the write is acknowledged as complete. If one pool is
not available due to a power failure or resource outage, you still can obtain volume data from the
other pool.
You cannot perform traditional replication on a SyncRep-enabled volume.
6.2.2 How Synchronous replication works
SyncRep is enabled on a per-volume basis. In volumes for which SyncRep is not enabled, volume data
and snapshots are located only in the pool to which the volume is assigned.
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