Sans Digital Mobileraid MR8X, Detailed User'S Manual

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SAS-to-SATA II RAID Subsystem
Installation and Configuration Manual
52
Stripe Size:
This parameter sets the size of the stripe written to each disk in a RAID 0, 1, 0+1, 3, 5
or 6 Volume Set. You can set the stripe size to 4 KB, 8 KB, 16 KB, 32 KB, 64 KB, or 128
KB.
A larger stripe size produces better-read performance, especially if your computer does
mostly sequential reads. However, if you are sure that your computer does random reads
more often, select a small stripe size.
NOTE Stripe Size in RAID level 3 can’t be modified .
Cache Mode:
The RAID subsystem supports Write-Through Cache and Write-Back Cache.
Write-Through: the RAID controller acknowledges data has been received when it
reaches the disk drives.
Write-Back: the RAID controller acknowledges data has been received when it reaches
the controller’s cache memory. This provides better performance but requires a battery
module support for the cache memory, or a UPS to connect the RAID system.
Tagged Command Queuing:
When this option is enabled, it enhances the overall system performance under multi-
tasking operating systems by reordering tasks or requests in the command queue of the
RAID system. This function should normally remain enabled.
SAS Port/LUN Base/LUN:
SAS Port : There are two 3Gbps SAS Host Channels in the RAID subsystem. Select the
SAS port where to map the LUN (Volume Set). Options are: 0 , 1 and 0&1 Cluster . 0
& 1 Cluster will make the LUN visible on both SAS ports.
LUN Base : T h e b ase LUN number. Each LUN Base supports 8 LUNs.
LUN: Each Volume Set must be assigned a unique LUN ID number. A SAS Port can
connect up to 128 devices (LUN ID: 0 to 127). Select the LUN ID for the Volume Set.