APC RAID Subsystem SCSI-SATA II Manual de usuario descargar pdf (Pagina 61)

SAS / SATA II NAS System

User’s Manual

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 where the system can be

connected.

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: The base 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.

Volumes To Be Created: Use this option to create several Volume Sets with the same

Volume Set attributes. Up to 128 Volume Sets can be created.

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APC RAID Subsystem SCSI-SATA II Manual de usuario Pagina 61