Redundancy And Error Handling - Intel RS2WG160 Hardware User's Manual

— No reboot necessary after expansion
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Upgradeable Flash ROM interface.
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Allows for staggered spin-up, hot-plug, and lower power consumption.
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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
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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

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SES2 enclosure management support
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SGPIO enclosure management support
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Fault indicators per drive.
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Drive coercion (auto-resizing to match existing disks).
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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.
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Auto-resume of initialization or rebuild on reboot (the Auto Rebuild feature must be
enabled before virtual disk creation).
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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.
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Smart Technology predicts failures of drives and electronic components.
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Patrol Read checks drives and maps bad sectors.
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Commands are retried at least four times.
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Firmware provides best effort to recognize an error and recover if possible.
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Failures are logged from controller and drive firmware, and SMART monitor.
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Failures are logged in NVRAM, viewable from OS Event Log, Intel
Console 2, CIM, and LEDs.
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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
— 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
— Non Read Ahead: Always reads from the drive after determining exact location
4
controller access.
power is lost.
cache.
of each read.
Intel® RAID Controller RS2WG160 Hardware User's Guide
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