Veritas Storage Foundation Release Notes
Veritas Storage Foundation⢠Release Notes: HP-UX - Symantec
Veritas Storage Foundation⢠Release Notes: HP-UX - Symantec
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<strong>Storage</strong> <strong>Foundation</strong> <strong>Release</strong> <strong>Notes</strong><br />
Changes introduced in 6.0<br />
21<br />
Enable compression with VVR<br />
VVR compression lets you send data over the network in a compressed format<br />
from a Primary to one or more Secondary hosts. Compression reduces network<br />
bandwidth consumption and is useful in scenarios where there is low available<br />
bandwidth or where the bandwidth is shared among several applications. The<br />
compression option can be enabled on a per system or per Secondary basis using<br />
the CLI.<br />
See the <strong>Veritas</strong> <strong>Storage</strong> <strong>Foundation</strong> and High Availability Solutions Replication<br />
Administrator's Guide.<br />
Replication performance improvement<br />
Replication performance is improved by introducing Secondary logging (logging<br />
the I/O on the Secondary SRL before writing to the data volume). The primary<br />
requirement for this feature to work is to have the same size SRL on both the<br />
Secondary and Primary. The Secondary SRL is used for staging the I/O from the<br />
Primary, and parallelize the data volume write. This improves the replication<br />
performance both in VVR and CVR. By default, this feature is enabled in 6.0.<br />
There are other replication-specific tunables that may be increased to obtain the<br />
maximum replication performance.<br />
See the <strong>Veritas</strong> <strong>Storage</strong> <strong>Foundation</strong> and High Availability Solutions Replication<br />
Administrator's Guide.<br />
Support for 8-node cluster applications<br />
In a shared disk group environment, VVR supports replication of 8-node cluster<br />
applications. In previous releases, support was limited to 4-node cluster<br />
applications.<br />
The following improvements enable scalability to 8-node support:<br />
■<br />
■<br />
■<br />
■<br />
Improved message processing allows the logowner to process more messages<br />
per second, resulting in improved application throughput<br />
Secondary logging feature improves replication performance<br />
Improved CPU usage provides more CPU cycles to the logowner to process<br />
requests from other nodes in a cluster<br />
Increased limit on max outstanding I/Os with VVR<br />
See the <strong>Veritas</strong> <strong>Storage</strong> <strong>Foundation</strong> and High Availability Solutions Replication<br />
Administrator's Guide.