Linksys NSS2000 Cisco NSS4000 and NSS6000 Series Network Storage System Admini - Page 79

Medium, Degraded Mode Grace Period, Enable Global Spares

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Configuring your Storage Storage Options 4 RAID rebuild priority, choose one of the following from the RAID Rebuild Priority field: • High: The CPU focuses on the RAID rebuilding process. This setting allows for the fastest possible RAID rebuild at the expense of other system tasks. File-sharing throughput is adversely affected during a RAID rebuild when this setting is chosen. - Medium: This option gives a balance between the rebuild process and other system tasks. The rebuild process takes longer than if it was set to High. - Low: The CPU focuses on other tasks versus the RAID rebuild process. This results in a longer rebuild time on a busy system. However, if the workload on the system is low, the CPU services the rebuild process well. Note that if you are repairing an array, this option leaves the array vulnerable until the rebuild is complete. • Degraded Mode Grace Period: Set the period of time after which the system automatically shuts down degraded arrays. You can manually restart RAID arrays automatically stopped by using degraded mode management. Warning messages are sent out periodically while the RAID array is degraded. • Enable Global Spares: Allow RAID arrays defined in the system to share spare drives. If this option is disabled, a RAID array can only use a spare that has been added to that particular array. If this option is enabled, spare drives added to one RAID array may be reallocated by the NSS to another RAID array. For example, if RAID A is a two-drive RAID1 that is not degraded and RAID B is a degraded two-drive RAID1, if you add a spare drive to RAID A, the NSS automatically gives the spare drive to RAID B to enable RAID B to resync. This option is only relevant when you use network disks (via storage virtualization). A system limited to local disks lets you only build up to two, two-disk RAID arrays, but have no spares. Linksys Small Business NSS4000 and NSS6000 Series Network Storage System Administration Guide 71

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Configuring your Storage
Storage Options
Linksys Small Business NSS4000 and NSS6000 Series Network Storage System Administration Guide
71
4
RAID rebuild priority, choose one of the following from the RAID Rebuild
Priority field:
•
High
: The CPU focuses on the RAID rebuilding process. This setting allows
for the fastest possible RAID rebuild at the expense of other system tasks.
File-sharing throughput is adversely affected during a RAID rebuild when
this setting is chosen.
-
Medium
: This option gives a balance between the rebuild process and
other system tasks. The rebuild process takes longer than if it was set to
High.
-
Low
: The CPU focuses on other tasks versus the RAID rebuild process.
This results in a longer rebuild time on a busy system. However, if the
workload on the system is low, the CPU services the rebuild process
well. Note that if you are repairing an array, this option leaves the array
vulnerable until the rebuild is complete.
•
Degraded Mode Grace Period
: Set the period of time after which the
system automatically shuts down degraded arrays. You can manually
restart RAID arrays automatically stopped by using degraded mode
management. Warning messages are sent out periodically while the RAID
array is degraded.
•
Enable Global Spares
: Allow RAID arrays defined in the system to share
spare drives. If this option is disabled, a RAID array can only use a spare that
has been added to that particular array. If this option is enabled, spare
drives added to one RAID array may be reallocated by the NSS to another
RAID array.
For example, if RAID A is a two-drive RAID1 that is not degraded and RAID B
is a degraded two-drive RAID1, if you add a spare drive to RAID A, the NSS
automatically gives the spare drive to RAID B to enable RAID B to resync.
This option is only relevant when you use network disks (via storage
virtualization). A system limited to local disks lets you only build up to two,
two-disk RAID arrays, but have no spares.