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Note: If write cache is enabled, in the event of a power failure, the data in the controller cache will be lost if you do not have a Battery Backup Unit (BBU). To avoid a sudden power failure if you do not have a BBU, it is advisable to have an Uninterruptible Power Supply (UPS).
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Note: If the Write Cache checkbox is disabled (not selectable), check to see if the unit has degraded or if the BBU is not ready. If a unit has a StorSave policy of “Protect” and the unit degrades, the policy prevents write cache from being re-enabled until the unit has been rebuilt or until the BBU is ready to use.
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1
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Choose Management > Controller Settings from the menu bar in 3DM.
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2
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In the Unit Policies section of the Controller Settings page, check the Write Cache box to enable it for the designated unit.
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