Why Open-E request to specify bandwidth value for volume replication?

Article ID: 172

Last updated: 26 Feb, 2009

Problem:

Can you shed some light why we need to specify the bandwidth when create a volume replication task and what is the recommended value for the SyncSource bandwidth.

Solution:

The bandwidth need to be specified because the daemon works with very high priority. So, in some cases, volume replication could use most of the hardware resources and this could make other applications run slow.

This limit preserve the hardware resources to get balanced between synchronizing and the rest of programs.

You can set the bandwidth to any value but you may notice some slowness in other functions/ applications. But please note that the bandwidth limit is valid ONLY during initializing or re-syncing (after connection lost) as long as destination shows inconsistent status. Once the destination volume show consistent, replication will use maximum possible bandwidth. In case of 1GB it is about 100Mb/s. And the default value we recommend for 10GB is 60MB.