Specifications

54 en | LCD Keypad Operation SCSI to SATA RAID Subsystem | Administrator’s Manual
F.01U.027.802 | V1 | 2006.11 Bosch Security Systems
5.4.8 Initialization Mode
This menu allows you to determine if the logical drive is immediately accessible. If the Online
method is used, data can be written onto it before the array’s initialization is completed.
Users may proceed with array configuration, e.g., including this array in a logical volume.
Array initialization can take a long time especially for those comprising large capacity. Setting
to “Online” means the array is immediately accessible and that the controller will complete
the initialization when I/O demands become less intensive.
5.4.9 Stripe Size
This menu allows you to change the array stripe size. Setting to an incongruous value can
severely drag performance. This item should only be changed when you can be sure of the per-
formance gains it might bring you.
Listed below are the default values for an array. For each logical drive, the default value for
the stripe size is determined by the Optimization Mode and the RAID level chosen.
When you are done setting logical drive preferences, press ESC and use your arrow keys to
select “Create Logical Drive?”. Press ENT for two seconds to proceed.
5.4.10 Beginning Initialization
Press ESC to return to the previous menu. Use the up or down arrow keys to choose “Create
Logical Drive,” then press ENT for two seconds to start initializing the logical drive.
The Online Mode:
If the online initialization method is applied, the array will be available for use immediately.
The array initialization runs in the background while data can be written onto it and users can
continue configuring the RAID system.
The Offline Mode:
The controller will start to initialize the array parity if using the “offline” mode. Note that if
NRAID or RAID 0 is selected, initialization time is short and completes almost immediately.
Opt. for Sequential I/O Opt. for Random I/O
RAID0 128KB 32KB
RAID1 128KB 32KB
RAID3 16KB 4KB
RAID5 128KB 32KB
NRAID 128KB 32KB
Table 5.2 RAID Level, Optimization Modes, and Stripe Size