System firmware file naming convention:
01ALXXX_YYY_ZZZ
XXX is the release level
YYY is the service pack level
ZZZ is the last disruptive service pack level
NOTE: Values of service pack and last disruptive service pack level (YYY and ZZZ) are only unique within a release level (XXX). For example, 01AL720_067_045 and 01AL740_067_053 are different service packs.
An installation is disruptive if:
The release levels (XXX) are different.
Example: Currently installed release is AL710, new release is AL720
The service pack level (YYY) and the last disruptive service pack level (ZZZ) are the same.
Example: AL720_120_120 is disruptive, no matter what level of AL720 is currently installed on the system
The service pack level (YYY) currently installed on the system is lower than the last disruptive service pack level (ZZZ) of the service pack to be installed.
Example: Currently installed service pack is AL720_120_120 and new service pack is AL720_152_130
An installation is concurrent if:
The release level (XXX) is the same, and
The service pack level (YYY) currently installed on the system is the same or higher than the last disruptive service pack level (ZZZ) of the service pack to be installed.
Example: Currently installed service pack is AL720_126_120, new service pack is AL720_143_120.