Toshiba Magnia 560S - Manual (Page 56)

Operating System Software Drivers 38
Features
Cache Memory
RAID Controller Kit-G cache memory resides in an onboard memory bank that uses 2
M x 72 (16 MB), 4 M x 72 (32 MB), 8 M x 72 (64 MB) or 16 M x 72 (128 MB)
unbuffered 3.3V SDRAM . Possible configurations are 8, 16, 32, 64, or 128 MB. The
maximum achievable memory bandwidth is 528 MB/s.
MegaRAID supports write-through or write-back caching, which can be selected for
each logical drive. To improve performance in sequential disk accesses, MegaRAID
does not use read-ahead caching for the current logical drive. The default setting for the
read policy is Normal, meaning no read-ahead caching. You can disable read-ahead
caching.
WARNING: Write caching is not recommended for the physical drives. When
write cache is enabled, loss of data can occur when power is interrupted.
MegaRAID BIOS
The BIOS resides on a 1 MB × 8 flash ROM for easy upgrade. The MegaRAID BIOS
supports INT 13h calls to boot DOS without special software or device drivers. The
MegaRAID BIOS provides an extensive setup utility that can be accessed by pressing
<Ctrl><M> at BIOS initialization. MegaRAID BIOS Configuration Utility is described
in the MegaRAID Configuration Software Guide.
Serial Port
RAID Controller Kit-G includes a 3-pin RS232C-compatible serial port berg connector,
which can connect to communications devices.
SCSI Bus
RAID Controller Kit-G has a Fast and Wide Ultra320 SCSI channel that supports both
LVD and single-ended devices with active termination. Synchronous and asynchronous
devices are supported. RAID Controller Kit-G provides automatic termination disable
using cable detection. The SCSI channel supports up to 15 wide or seven non-wide
SCSI devices at speeds up to 320 MB/s. RAID Controller Kit-G supports up to six
non-disk devices per controller.
SCSI Connectors
RAID Controller Kit-G has two types of SCSI connectors:
•
A 68-pin high density internal connector
•
A 68-pin external very-high-density connector
Both connector types can be used for the SCSI channel.