Are Hot Fix Drives Needed; Intel Raid Controller Hardware Features; Architecture Features (Hw); Table 3. Raid Level, Hard Drives, And Usable Storage Capacity - Intel SRCU32 - RAID Controller User Manual

Table 3. RAID Level, Hard Drives, and Usable Storage Capacity
RAID Level
RAID 0
RAID 1
RAID 4
RAID 5
RAID 10
* Each hard drive is assumed to have 1 GB capacity.

Are Hot Fix Drives Needed?

Assume that one of the hard drives of the RAID 5 disk array fails (Hot Fix drives are available with
RAID 1, 4, 5, and 10 arrays). The disk array is without redundancy. Time Without Redundancy
(TWR) starts to run. Any unnecessary prolongation of the TWR (the time required to get a
replacement drive, or because you did not immediately recognize the failure) increases the risk of
data loss that will occur should a second drive fail. Therefore, redundancy should be restored as
soon as possible and in an automated manner. Integrating a Hot Fix drive (also referred to as hot
spare) as an immediately available and auto-replacing drive is the most effective way to keep the
TWR as short as possible. Only a Hot Fix drive can ensure optimal disk array security and constant
data availability.
Using a Hot Fix drive is not compulsory. If you control the disk array at regular intervals and
immediately replace a defective drive (by shutting down the system or hot-plugging), you can
operate the system without a Hot Fix drive.

Intel RAID Controller Hardware Features

This section provides a summary of the key features, configuration options and support interface
technology supported by the IIR controller.

Architecture Features (HW)

Table 4. Hardware Architecture
Component
I/O Microprocessor
Cache Memory
Flash Memory
I/O interface (PCI)
PCI Transfer Rate
PCI Signaling
SCSI Controller: LSI SYM53C1010
Getting Started
Available Available
Capacity with Capacity with
2 Hard Drives* 3 Hard Drives*
2 GB 3 GB
1 GB 1 GB
NA 2 GB
NA 2 GB
NA NA
Feature
The 80303 uses the 100MHz Intel 80960JT-100 core with a
100MHz/64-bit internal bus
800MB/sec,
The SRCU32 supports up to 256MB of 64-bit ECC SDRAM
operating at 100MHz. Memory is expandable to 64, 128, or 256MB.
3.3v, 16Mb (2MB) flash memory chip is used to store the RAID
firmware
PCI 2.2 compliant, universally keyed for 3.3 and 5 volt PCI slots
528MB/sec (Burst)
5 or 3.3 volt
Dual channel Ultra160
Available
Capacity with
4 Hard Drives*
4 GB
1 GB
3 GB
3 GB
2 GB
with an internal throughput of up to
to and from the internal IOP peripherals.
Available
Capacity with
5 Hard Drives*
5 GB
1 GB
4 GB
4 GB
NA
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