LSI 1600 Manual De Usuario
MegaRAID Enterprise 1600 Hardware Guide
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Components
CPU
The MegaRAID controller uses the 64-bit Intel i960RN Intelligent I/O processor with an
embedded 32-bit 80960 Jx RISC processor that runs at 100 MHz. This processor directs all
functions of the controller including command processing, PCI and SCSI bus transfers, RAID
processing, drive rebuilding, cache management, and error recovery.
embedded 32-bit 80960 Jx RISC processor that runs at 100 MHz. This processor directs all
functions of the controller including command processing, PCI and SCSI bus transfers, RAID
processing, drive rebuilding, cache management, and error recovery.
Cache Memory Cache memory resides in a single 64-bit DIMM socket that requires one X8 or X16 unbuffered
3.3V SDRAM single-sided or double-sided DIMM. Possible configurations are 16, 32, 64, or 128
MB.
MB.
MegaRAID supports write-through or write-back caching, which can be selected for each logical
drive. 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.
drive. 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 or 2 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 Configuration Utility is described in the MegaRAID Configuration
Software Guide.
BIOS provides an extensive setup utility that can be accessed by pressing <Ctrl> <M> at BIOS
initialization. MegaRAID Configuration Utility is described in the MegaRAID Configuration
Software Guide.
Onboard Speaker MegaRAID has an onboard tone generator for audible warnings when system errors occur.
Audible warnings can be generated through this speaker. The audible warnings are listed on page
125.
125.
Serial Port
MegaRAID includes a 9-pin RS232C-compatible serial port berg connector, which can connect to
communications devices and external storage devices.
communications devices and external storage devices.
SCSI Bus
MegaRAID Enterprise 1600 has four 160M Wide SCSI channels that support low voltage
differential SCSI devices with active termination. Both synchronous and asynchronous devices are
supported. MegaRAID provides automatic termination disable via cable detection. Each channel
supports up to 15 wide or seven non-wide SCSI devices at speeds up to 160 MB/s per SCSI
channel. MegaRAID supports up to
differential SCSI devices with active termination. Both synchronous and asynchronous devices are
supported. MegaRAID provides automatic termination disable via cable detection. Each channel
supports up to 15 wide or seven non-wide SCSI devices at speeds up to 160 MB/s per SCSI
channel. MegaRAID supports up to
six non-disk devices per controller. The SCSI bus mode
defaults to LVD for each SCSI channel. If a single ended device is attached to a SCSI channel,
MegaRAID automatically switches to SE mode for that SCSI channel.
MegaRAID automatically switches to SE mode for that SCSI channel.
SCSI Connectors MegaRAID has two types of SCSI connectors:
• two 68-pin high density internal SCSI connectors (Channels A and B only)
•
four 68-pin external ultra-high-density external SCSI connectors (Channels A, B, C, and D)
Cont’d