Redundancy And Error Handling - Intel AXXRMS2AF080 Hardware User's Manual

— No reboot necessary after expansion
— Load Balancing
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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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SGPIO, In-band and out-band SES2 Enclosure management support.
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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 on reboot of initialization or rebuild (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, LEDs.
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Access policy:
— RW: allow read and write I/O
— Read Only: allow read I/O only
— Blocked: deny read and write I/O
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Redundancy through:
— Configuration stored in non-volatile RAM and on the drives (COD).
— Hot-swap support.
4
controller access.
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