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92 Chapter 5 Configuring the xStack Storage Array
5.4.15 Setting the System Battery Policy
If your xStack Storage Array has an onboard battery, the system battery policy defines how
contents in cache memory are handled if the battery is not fully charged. By default, the xStack
Storage Array is configured to buffer all I/O in cache memory. You can, however, change this
setting to protect data against situations when the battery is not fully charged.
1. Click the xStack Storage icon on the Physical Resources tab.
2. Perform one of the following steps:
–
On the File menu, click Set System Battery Policy .
–
Right-click and click Set System Battery Policy .
Either step displays the Battery Policy dialog box appears, with the current setting shown
(see Figure 5-44). The icon at the top of the dialog box provides a color-coded indication of
the xStack Storage Array battery status.
Figure 5-44. Battery Policy Dialog Box
3. Select the appropriate setting that the xStack Storage Array should whenever the battery is
not fully charged (see Table 5-18).
4. Click OK .
Table 5-18 Battery Policy Settings
Setting Description
Ignore the status of the battery and
do nothing No action is taken to protect the contents of cache data in the event of an uncharged
battery. If the xStack Storage Array loses AC power, its onboard battery will be used to
protect the contents of cache memory (up to 72 hours for a fully charged battery).
Stop buffering I/O in cache, and
directly write data to disk I/O buffered in cache memory is written to disk whenever the xStack Storage Array
battery is not fully charged.
Prevent any reads from or writes to
volumes Stops all read and write operations whenever the battery is not fully charged.