Cisco NSS2000 - Gigabit Storage System Chassis Administration Manual page 74

Configuring your Storage
Storage Options
Cisco Small Business NSS2000 Series Administration Guide
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Degraded Mode Grace Period: Set the period of time after which the
system automatically shuts down degraded arrays. You can manually
restart a RAID array that has been automatically stopped by the degraded
mode management feature. Warning messages are sent out periodically
while the RAID array is degraded.
If you make changes to any of the storage options, click Update.
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