Dell PS4100 Technical Information download pdf (Page 40)

June 2012 Dell EqualLogic Configuration Guide v13.2 34

Table 14 Replication Space Sizing Guidelines

Replication Space

Recommended

Value

Space Efficient

Value

Local Reserve

(Located on Primary Group.)

No Failback

Snapshot:

100% 5% + CR

(a)

Keep

Failback

Snapshot:

200% 10% + CR

(a)

Replica Reserve

(Located on Secondary Group.)

200%

Ensures there is adequate

space for the last replica and

any replica in progress.

105%

(b)

+ CR

x (# of Replicas – 1)

Delegated Space

(Located on Secondary Group. The

replica reserve space for all replica

sets coming from a single group)

Must be large enough to hold

the sum of all replica reserve

sizes for all volumes

replicating to that group.

Monitor change rate, adjust to

lower than recommended

value and continue

monitoring.

(a) CR: “Change Rate”. For details on how volume changes affect replication space, see the Centralized Replication

section under Replication Configuration Options in the Group Manager Help documentation.

(b) Start with 105%, then add to that the maximum number of replicas expected to be stored in the replica set minus 1,

multiplied by the expected Change Rate.

3.8.6 Effect of TCP Window Size on Latency across WAN links

In certain cases, increasing the TCP Window Size setting on PS Series controllers can improve

replication throughput across WAN links. The ability to change this setting is currently not supported

using the EqualLogic Group Manager. Customers interested in changing TCP Window size settings

should contact Dell EqualLogic Technical Support for assistance. For more details on how this setting

can affect replication performance across WAN links, see the following publication:



Dell EqualLogic Auto-Replication: Best Practices and Sizing Guide

http://www.delltechcenter.com/page/Dell+EqualLogic+Auto-

Replication+Best+Practices+and+Sizing+Guide

3.8.7 Replication Partner Compatibility

Table 14 provides details on replication partner interoperability based on array firmware version. For

the latest information, consult the release notes for your array firmware version.

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