3 Intel® RAID Controller SRCSATAWB Hardware User’s Guide

Redundancy and Error Handling

• In-band and out-of-band SES2.

• Enclosure management support.

• Activity and 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 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)

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Intel SRCSATAWB Manuale Utente Pagina 8

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