Memory
| Internal memory |
0.25 GB |
| Internal memory type |
DDR2 |
| Memory clock speed |
667 MHz |
| Memory bus |
72 bit |
Intel RAID Portable Cache Module, Memory, Upgrade-Kit
Intel® RAID Portable Cache Module AXXRPCM3 is a compact package that contains the following components.
-Battery pack: Includes a circuit logic board and attached LiON (Lithium Ion) batteries.The logic board provides sensing and management logic to support the battery charge, discharge, and monitoring functionality. The battery includes a small cable that connects the battery to the battery logic board (Smart Battery Circuit).
-Smart Battery Circuit: Ensures that the battery is maintained at optimal performance and charge levels. This circuit is based on the Texas Instruments bq2060A SBS v1.1- Compliant Gas Gauge IC.
-Software to monitor / inform the user of issues and actions for the Intel® RAID Portable Cache Module. Monitoring is accomplished through the Intel® RAID BIOS Console 2, Intel® RAID Web Console 2, or Intel® RAID Command Line Utility 2 utilities.
The Intel® RAID Portable Cache Module AXXRPCM3 provides the Intel® RAID Controller SRCSASJV adapter with battery-backed cache memory. Writing data to the controller’s cache memory is much faster than writing it to a storage device. The write operation is completed when data is transferred to the RAID (Redundant Array of Inexpensive Disks) cache.
After data is written to the cached memory, the Intel® RAID Controller SRCSASJV writes the cached data to the storage device when system activity is low or when the cache is getting full. One risk of using a write-back cache is the cached data can be lost if the AC power fails before it is written to the storage device. The Portable Cache Module mitigates this risk by providing a battery as a backup source of power. Users can adjust options for the highest performance without increasing the risk of data loss. The Intel® RAID Portable Cache Module AXXRPCM3
provides additional fault tolerance when used in conjunction with a UPS (Uninterruptible Power Supply).
The Intel® RAID Portable Cache Module AXXRPCM3 monitors the voltage level of the DRAM modules installed on the Intel® RAID Controller SRCSASJV. If the voltage level drops below a predefined level, the battery backup module portion of the Portable Cache Module switches the
memory power source from the Intel® RAID Controller SRCSASJV to the battery pack on the Portable Cache Module. When the voltage level returns to an acceptable level, the battery backup circuitry switches the power source back to the Intel® RAID Controller SRCSASJV and
all pending writes to storage devices are completed with no data loss.
The Intel® RAID Portable Cache Module AXXRPCM3 has built-in functionality to charge the battery pack automatically and to communicate battery status information such as voltage, temperature, and current to the host computer system. The Portable Cache Module will cache data to a replacement controller if that data has not been written to a disk. This could be necessary if the RAID controller fails after an unexpected power failure. After moving thePortable Cache Module and the associated hard disk drives to a replacement Intel® RAID
Controller SRCSASJV, the Intel® RAID Portable Cache Module AXXRPCM3 flushes the unwritten data preserved in the cache to the disks through the new adapter.
