Intel RT3WB080 Hardware User Guide - Page 14

Redundancy and Error Handling, Failures are logged in NVRAM, viewable from OS Event Log, Intel - firmware

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Redundancy and Error Handling • In-band and out-of-band SES2. • Enclosure management support. • Support the internal SATA Sideband signal SFF-8485 (SGPIO) interface. • Drive coercion (auto-resizing to match existing disks). • Auto-detection of failed drives with transparent rebuild. There must be disk activity (I/O to the drive) for a missing drive to be marked as failed. • Auto-resume on reboot of initialization or rebuild (must be enabled before virtual disk creation). • Smart initialization automatically checks consistency of virtual disks if there are five or more disks in a RAID 5 array, which optimizes performance by enabling readmodify-write mode. RAID 5 arrays of only three or four drives use Peer Read mode. • Dirty cache LED plus error reporting for cache write to disk. • Smart Technology predicts failures of drives and electronic components. • Patrol Read checks drives and maps bad sectors. • Commands are retried at least four times. • Firmware provides best effort to recognize an error and recover if possible. • Failures are logged from controller and drive firmware, and SMART monitor. • Failures are logged in NVRAM, viewable from OS Event Log, Intel® RAID Web Console 2; CIM, LEDs, and via alarm. • Multiple cache options allow configuration-specific performance optimization: - Write-back: Faster because it does not wait for the disk but data will be lost if power is lost. - Write-through: Usually slower but ensures data is on the disk. - Read Ahead: Predicts next read will be sequential and buffers this data into the cache. - Non-Read Ahead: Always reads from the drive after determining exact location of each read. - Adaptive Read Ahead: Reads ahead and caches data only if doing sequential reads. - I/O setting: Determines whether read operations check the cache before reading from disks. ✧ Cache I/O: Checks cache first; only reads disk if data is not in the cache. ✧ Direct I/O: Reads data directly from disk (not cache). • Redundancy through: - Configuration stored in non-volatile RAM and on the drives (COD). - Hot-swap support. - Optional battery backup for cache memory. 4 Intel® RAID Controller RT3WB080 Hardware User's Guide

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Intel® RAID Controller RT3WB080 Hardware User’s Guide
Redundancy and Error Handling
•
In-band and out-of-band SES2.
•
Enclosure management support.
•
Support the internal SATA Sideband signal SFF-8485 (SGPIO) interface.
•
Drive coercion (auto-resizing to match existing disks).
•
Auto-detection of failed drives with transparent rebuild. There must be disk activity
(I/O to the drive) for a missing drive to be marked as failed.
•
Auto-resume on reboot of initialization or rebuild (must be enabled before virtual
disk creation).
•
Smart initialization automatically checks consistency of virtual disks if there are five
or more disks in a RAID 5 array, which optimizes performance by enabling read-
modify-write mode. RAID 5 arrays of only three or four drives use Peer Read mode.
•
Dirty cache LED plus error reporting for cache write to disk.
•
Smart Technology predicts failures of drives and electronic components.
•
Patrol Read checks drives and maps bad sectors.
•
Commands are retried at least four times.
•
Firmware provides best effort to recognize an error and recover if possible.
•
Failures are logged from controller and drive firmware, and SMART monitor.
•
Failures are logged in NVRAM, viewable from OS Event Log, Intel
®
RAID Web
Console 2; CIM, LEDs, and via alarm.
•
Multiple cache options allow configuration-specific performance optimization:
—
Write-back: Faster because it does not wait for the disk but data will be lost if
power is lost.
—
Write-through: Usually slower but ensures data is on the disk.
—
Read Ahead: Predicts next read will be sequential and buffers this data into the
cache.
—
Non-Read Ahead: Always reads from the drive after determining exact location
of each read.
—
Adaptive Read Ahead: Reads ahead and caches data only if doing sequential
reads.
—
I/O setting: Determines whether read operations check the cache before reading
from disks.
✧
Cache I/O: Checks cache first; only reads disk if data is not in the cache.
✧
Direct I/O: Reads data directly from disk (not cache).
•
Redundancy through:
—
Configuration stored in non-volatile RAM and on the drives (COD).
—
Hot-swap support.
—
Optional battery backup for cache memory.