Version 6.6 815 October 2014
Installation & Operation Manual 46. Online Software Upgrade
The time of the Online Software Upgrade may be estimated using the following
formula (all values are measured in minutes):
where:
is the time of the Media Gateway Software package transfer over the
network. The transfer is performed twice – first between the EMS client and the
EMS server (during version upload to the EMS server's "Files Manager") and
after that between the EMS server and the SC boards (during the Welcome stage
of the Online Software Upgrade Wizard). The time may be estimated based on
the available IP network bandwidth as described in 'Preparing the IP Network' on
page 814. To reduce this time, transfer software package prior to the
maintenance time period as described in 'Transferring the SC Software Package
to the SC Boards' on page 823.
is the number of unlocked Media Gateway boards. If the Media
Gateway is not "in service", you may lock the entire Media Gateway (and all of its
boards) prior to starting the Online Software Upgrade to minimize the upgrade
time. After the upgrade is finished, unlock the Media Gateway to complete
upgrade of Media Gateway boards to the new software version.
is the time of a Media Gateway board's upgrade. For Hitless Upgrade
mode, it approximately equals 5 minutes. For Graceful Shutdown mode, it may be
calculated using the following formula
where
is the Graceful Shutdown time (in minutes) that is configured in
the Online Software Upgrade Wizard's "Welcome Questionnaire" screen. The
default value of Graceful Shutdown time is 6 minutes. To reduce the Media
Gateway board's upgrade time, configure a smaller Graceful Shutdown period.
is the time required for OS patches installation on a single SC board.
OS patches must be installed on both SC boards. The Online Software Upgrade
process determines the exact number of OS patches to be installed and indicates
the number at the early stages of the Online Software Upgrade wizard, together
with the estimated installation time.If you upgrade between major software
versions on SC Rev.1 boards (using the Solaris OS), the OS patch installation
may take more than 1 hour on each SC board. For SC Rev.2 boards (using the
Linux OS), the OS patches installation typically takes less than 5 minutes. To
reduce the time of OS patches installation on SC Rev.1 boards, pre-install the OS
patches as described in as described in 'Pre-installing OS Patches' on page 817.
is the time of ES board's upgrade. If you upgrade between major
software versions, it takes approximately 6 minutes to upgrade each ES board.
However, if you are upgrading between minor software versions (maintenance
releases) and the version of ES board's software is not altered, this value is zero
(no upgrade of ES boards is needed).
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