Dell PowerVault MD3000 - Manual (Page 28)

28 Storage Array
Battery Settings
A smart battery backup unit (BBU) can perform a learn cycle. The smart BBU
module includes the battery, a battery gas gauge, and a battery charger. The
learn cycle calibrates the smart battery gas gauge so that it provides a
measurement of the charge of the battery module. A learn cycle can only start
when the battery is fully charged.
The learn cycle completes the following operations:
• Discharges the battery to a predetermined threshold
• Charges the battery back to full capacity
A learn cycle starts automatically when you install a new battery module.
Learn cycles for batteries in both RAID controller modules in a duplex system
occur simultaneously.
NOTE: It might take several hours for a learn cycle to complete.
NOTE: Write caching on all virtual disks is disabled during this time.
Learn cycles are scheduled to start automatically at regular intervals, at the
same time and on the same day of the week. The interval between cycles is
described in weeks.
Use the following guidelines to adjust the interval:
• You can use the default interval.
• You can run a learn cycle at any time.
• You can set the learn cycle earlier than the currently scheduled time.
• You cannot set the learn cycle to start more than seven days later than the
currently scheduled time.
To modify the settings, click the Tools tab → Change Battery Settings.
Starting or Restarting the Host-Agent Software in
Windows
The host-agent software module is the software component that resides on
the server or management station that communicates with the MD3000 or
MD3000i external storage enclosures. The SMagent software automatically
starts after you reboot the host. If you add a storage array after the host server
has started, or iSCSI sessions are created while the SMagent is running, or the