American Megatrends ManageTrends 2.7, User Manual

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StorTrends® 1300 User’s Guide (StorTrends iTX version 2.7) 294
Action on Power Failure
Whenever the A/C power fails, the UPS takes over and the StorTrends boxes start
running on the UPS. Depending on the type of the UPS and the load on it, it will start
discharging and the amount of time and charge left in the UPS can be monitored using
the ManageTrends. Also, as soon as the UPS switches from the A/C power mode to the
battery mode, the StorTrends boxes switch their Caching modes from Write-Back to
Write-Through. The following screenshots display the cache modes before and after the
UPS takeover. It can be seen that after the UPS takeover, the Advanced Caching mode
becomes disabled.
Cache Mode before UPS takeover
Cache Mode after UPS takeover
Also the following shows the StorTrends logging the change in the Cache mode in its
logs.