Product specifications

LCD Keypad Operation
2-3
2.2.2 Optimization Mode and Stripe Size
Each controller optimization mode has preset values for the stripe
size of arrays created in different RAID levels. If you want a
different setting for a subsystem with configured arrays, you have
to backup or move the stored data and re-create the arrays:
1. Stop host I/O access.
2. Move or backup all of your stored data in the subsystem.
3. Change the optimization mode.
4. Reset the controller.
5. Re-create the array(s). Once the array(s) are created, stripe
size cannot be changed.
Listed below are the default stripe sizes implemented with
different optimization modes and RAID levels. These values
should be sufficient for most applications:
Table 2 - 1 RAID Level, Optimization Modes, and Stripe Sizes
Opt. For Sequential I/O Opt. for Random I/O
RAID0 128KB 32KB
RAID1 128KB 32KB
RAID3 16KB 4KB
RAID5 128KB 32KB
RAID6 128KB 32KB
NRAID 128KB 32KB
2.2.3 Optimization for Random or Sequential I/Os
Select from Main Menu “View and Edit
Config Parms,” “Caching Parameters,”
and press ENT. Choose “Optimization for
Random I/O” or “Optimization for
Sequential I/O,” then press ENT for two
seconds to confirm. Press ESC to leave
and the setting will take effect after the
controller is restarted.
IMPORTANT!
The original 512GB threshold on array optimization mode has been
canceled. If the size of an array is larger than 16TB, only the
optimization for sequential I/O can be applied. Logical drives of this size
may not be practical; therefore, there is actually no limitation on the
optimization mode and array capacity.
Optimization I/O
Random ..
Caching
Parameters ..
O
ptimization for
Sequential I/O?