Veritas Storage Foundation 5.1 SP1 Cluster File System Release Notes (5900-1509, April 2011)

For information on setting the network protocol, see the Veritas™ Volume
Replicator Administrator's Guide.
Checksum is disabled by default for the TCP/IP protocol
Beginning with Storage Foundation 5.1 SP1, if you specify TCP as your protocol,
then by default, VVR does not calculate the checksum for each data packet it
replicates. VVR relies on the TCP checksum mechanism. However, if a node in a
replicated data set is using a version of VVR earlier than 5.1 SP1, VVR calculates
the checksum regardless of the network protocol.
If you are using UDP/IP, checksum is enabled by default.
Improved replication performance in the presence of snapshots
on the secondary site
The effect of snapshots on the secondary site is less drastic on replication
performance.
SmartMove for VVR
The SmartMove for VVR feature enables VVR to leverage information from VxFS
knowledge of the file system blocks in use to optimize the time and network
bandwidth required for initial resync of replicated volumes.
See the Veritas Volume Replicator Administrator's Guide for more information
on SmartMove for VVR.
Veritas Volume Replicator supports IPv6
Veritas Volume Replicator supports IPv6 in this release. IPv6 is supported only
with disk group version 150 or later.
The Internet Protocol version 6 (IPv6) is the next-generation Internet Layer
protocol for packet-switched networks and the Internet. IPv4 is the first version
of the protocol to be widely deployed. IPv6 has a much larger address space than
IPv4. This results from the use of a 128-bit address, whereas IPv4 uses only 32
bits. This expansion provides flexibility in allocating addresses and routing traffic
and eliminates the primary need for network address translation (NAT). IPv6 also
implemented new features that simplify aspects of address assignment and
network renumbering when changing Internet connectivity providers. Network
security is integrated into the design of the IPv6 architecture.
See “IPv6 software limitations” on page 48.
See the Veritas Volume Replicator Administrator's Guide for more information
on VVR IP terminology.
15Storage Foundation Cluster File System Release Notes
Changes introduced in 5.1 SP1