Intel RS2WG160 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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- No reboot necessary after expansion • Upgradeable Flash ROM interface. • Allows for staggered spin-up, hot-plug, and lower power consumption. • User specified rebuild rate (percent of system resources to use from 0-100%). Caution: Exceeding 50% rate may cause operating system errors due to waiting for controller access. • Background operating mode can be set for Rebuilds, Consistency Checks, Initialization (auto restarting Consistency Check on redundant volumes), Migration, OCE, and Patrol Read. Redundancy and Error Handling • SES2 enclosure management support • SGPIO enclosure management support • Fault indicators per drive. • 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 of initialization or rebuild on reboot (the Auto Rebuild feature 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. • 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, and LEDs. • 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. 4 Intel® RAID Controller RS2WG160 Hardware User's Guide

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4
Intel® RAID Controller RS2WG160 Hardware User’s Guide
—
No reboot necessary after expansion
•
Upgradeable Flash ROM interface.
•
Allows for staggered spin-up, hot-plug, and lower power consumption.
•
User specified rebuild rate (percent of system resources to use from 0-100%).
Caution:
Exceeding 50% rate may cause operating system errors due to waiting for
controller access.
•
Background operating mode can be set for Rebuilds, Consistency Checks,
Initialization (auto restarting Consistency Check on redundant volumes), Migration,
OCE, and Patrol Read.
Redundancy and Error Handling
•
SES2 enclosure management support
•
SGPIO enclosure management support
•
Fault indicators per drive.
•
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 of initialization or rebuild on reboot (the Auto Rebuild feature 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.
•
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, and LEDs.
•
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.