
38
LenelS2 EVA 54 User Manual
• When a physical drive in a disk array fails and a spare drive of adequate capacity
is available, the disk array begins to rebuild automatically using the spare drive.
• If there is no spare drive of adequate capacity, but the Auto Rebuild function is
ENABLED, the disk array begins to rebuild automatically as soon as you remove
the failed physical drive and install an unconfigured physical drive in the same
slot.
• If there is no spare drive of adequate capacity and the Auto Rebuild function is
DISABLED, you must replace the failed drive with an unconfigured physical drive,
then perform a Manual Rebuild.
Background synchronization
Synchronization is automatically applied to redundant logical drives when they are
created. Synchronization recalculates the redundancy data to ensure that the
working data on the physical drives is properly in sync.
Background Synchronization Rate
1. To change Background Synchronization Rate setting the in Background Activities
Settings menu: Click the Synchronization Rate drop-down menu and choose a
rate:
• Low – Fewer system resources to Synchronization, more to data read/write
operations.
• Medium – Balances system resources between Synchronization and data
read/write operations.
• High – More system resources to Synchronization, fewer to data read/write
operations.
2. Click the Submit button.
Logical drive initialization
Technically speaking, Initialization is a foreground activity, as you cannot access a
logical drive while it is initiating.
Initialization is normally done to logical drives after they are created from a disk
array. Initialization sets all data bits in the logical drive to zero. The action is useful
because there may be residual data on the logical drives left behind from earlier
configurations. For this reason, Initialization is recommended whenever you create a
logical drive.
Logical Drive Initialization Rate
To change Logical Drive Initialization Rate setting the in Background Activities
Settings menu:
1. Click the Logical Drive Initialization Rate drop-down menu and choose a rate:
• Low – Fewer system resources to Initialization, more to data read/write
operations.