User guide

current environment in the course of a day hour, minute, or second. The
value is expressed in terabytes, gigabytes, megabytes, or kilobytes.
Gross bandwidth available for replication
Indicate one of the following network types available for replication
activity:
DS1/T1
Digital service hierarchy level 1 network, offering up to a
maximum channel capacity of 1.544 Mb/s.
DS2 Digital service hierarchy level 2 network. Offering one 6.312 Mb/s
channel, equivalent to 96 voice grade lines, each with 64-Kbps
capacity.
DS3/T3
Digital service hierarchy level 3 network, offering up to a
maximum channel capacity of 44.736 Mb/s.
OC3 Optical Carrier level 3 network, offering up to a maximum channel
capacity of 155.52 Mb/s.
100-Mb/s LAN
Local Area Network, offering up to a maximum channel capacity
of 100 Mb/s.
10 Gb/s LAN
Local Area Network, offering up to a maximum channel capacity
of 10 Gb/s.
Net bandwidth available for replication after overhead
The total usable network capacity, by percentage available for transactions,
after accounting for network overhead.
Preferred unit of measure for time to complete first replication
The days, hours, minutes, or seconds required to copy the initial dataset
while replicating changes.
Note: Network bandwidth capacities do not affect recovery times of systems in the
VSR solution. Site/system I/O changes greater than network bandwidth capacities
affect only a system recovery point, not its recovery time.
Important: Throttling network bandwidth devoted to VSR replication might result
in degraded RPO.
Procedure
1. Record or select the necessary information in the IBM SmartCloud VSR
Bandwidth Estimator input fields.
Chapter 1. Introduction 9