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Other planning considerations
November 2004
Avaya Modular Messaging Concepts and
Planning Guide
13-3
Note: When using wiring to enable two MAS units to be
serviced by a single extension on the switch, one
must ensure that only one MAS unit is allowed to
make outcalls.
! For greater reliability, ensure that extension numbers for the port
boards on the MAS are distributed over a number of switch
boards.
N+1 server
configuration for
MAS redundancy
Modular Messaging offers redundancy of voice ports by way of an N+1
server configuration.
With an N+1 server configuration, customers can purchase more MAS
units than are required in a standard configuration, and can set up ports on
this additional MAS. For more information, see N+1 server configuration
on page 5-27.
Message Store Server redundancy
In the event that a message store becomes unavailable to MAS units,
Modular Messaging continues to provide Call Answer services and
emergency retrieval of new Call Answer messages from the Modular
Messaging TUI. For more information, see Offline messaging
on page
5-21.
Customers that require Avaya Message Storage Server redundancy are
advised to consider implementing the high-availability configuration of
the MSS (MSS—H).
The MSS—H offers:
! 2 redundant, hot swappable chassis fans and 2 redundant, hot
swappable power supplies
! 3 hot swappable SCSI RAID drives with hardware RAID Level 5
data redundancy
! Remote Maintenance Board (connects to analog line for alarm
reporting and servicing; international versions require an external
modem)
Note: For non-domestic sites, an external modem is
required in addition to the RMB
! The MSS—H uses a Digital Versatile Disc (DVD) Random
Access Memory (RAM) drive to back up data. One DVD-RAM
medium holds approximately 4.7-GB of data. In the event of a
system failure, the data stored on the media is used to restore the
system back to an operational state. For more information, see
CD-ROM Avaya Modular Messaging Release 2 Documentation,
11-300121