Intel SRCSASPH16I Hardware User Guide - Page 12
Redundancy and Error Handling - firmware
UPC - 735858201339
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• User specified rebuild rate (% of system resources to use from 0-100%). Warning: Exceeding 50% rate may cause operating system errors caused by 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 • Enclosure management support, including LEDs. • Activity and fault indicators per drive, port selector (dual-port drives). • Drive coercion (auto resizing to match existing disks). • Auto-detection of failed drives with transparent rebuild. Disk activity (I/O to the drive) must be present 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 overdrives use peer read mode. • Dirty cache LED plus cache write to disk error reporting. • 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 from it if possible. • Failures are logged from controller and drive firmware, SMART monitor, SAF-TE controller. • Failures are logged in NVRAM, viewable from OS Event Log, Intel® RAID Web Console 2; CIM, LEDs, and via alarm. • Multiple cache options provide choice of speed, redundancy: - Write: The data written / (done) signal is returned when data is written to drive or only to cache: ^ Write-back (default): Faster, because it since doesn't wait for the disk, but data will be lost if power is lost. ^ Write-through: Slower, but ensures data is on the disk. - Read Ahead: Predicts the next read will be sequential and buffers this data into the cache: ^ NonRead Ahead: Always reads from the drive after determining the exact location of each read. ^ Adaptive Read Ahead: Will read ahead and cache data only if doing sequential reads. 3 Intel® RAID Controller SRCSASPH16I Hardware Guide