Specifications
Changing the Data Replication Path
l This release of SteelEye DataKeeper does not support Automatic Switchback for DataKeeper
resources. Additionally, the Automatic Switchback restriction is applicable for any other
LifeKeeper resource sitting on top of a DataKeeper resource.
l If using Fusion-io, see the Network section of Clustering with Fusion-io for further network con-
figuration information.
Changing the Data Replication Path
Starting with LK 7.1, mirror endpoints can be modified using lk_chg_value. For example, to
change a mirror endpoint from IP address192.168.0.1 to 192.168.1.1:
1. /etc/init.d/lifekeeper stop-nofailover (lk_chg_value cannot be run while
LifeKeeper is running)
2.
lk_chg_value -o 192.168.0.1 -n 192.168.1.1
3.
/etc/init.d/lifekeeper start
Execute these commands on all servers involved in the mirror(s) that are using this IP address.
Note: This command will also modify communication paths that are using the address in question.
Determine Network Bandwidth Requirements
Prior to installing SteelEye DataKeeper, you should determine the network bandwidth requirements
for replicating your current configuration whether you are employing virtual machines or using
physical Linux servers. If you are employing virtual machines (VMs), use the method Measuring
Rate of Change on a Linux System (Physical or Virtual)to measure the rate of change for the virtual
machines that you plan to replicate. This value indicates the amount of network bandwidth that will be
required to replicate the virtual machines.
After determining the network bandwidth requirements, ensure that your network is configured to
perform optimally. If your network bandwidth requirements are above your current available network
capacity, you may need to consider one or more of the following options:
l Enable compression in SteelEye DataKeeper (or in the network hardware, if possible)
l Increase your network capacity
l Reduce the amount of data being replicated
l Create a local, non-replicated storage repository for temporary data and swap files
l Manually schedule replication to take place daily at off-peak hours
Measuring Rate of Change on a Linux System (Physical
or Virtual)
DataKeeper for Linux can replicate data across any available network. In Multi-Site or Wide Area
Network (WAN) configurations, special consideration must be given to the question, "Is there
SteelEye Protection Suite for Linux267