Intel SRCU31 user manual System Management, What is RAID?, Auto Declare Spare

RAID Features

transients on the SCSI bus itself and even the best drives and enclosures may not ‘hot swap’ correctly while the bus is experiencing heavy traffic.

5.1.4.3Auto Declare Spare

If a disk drive is brought online into a system with a degraded volume, SRCU31 will automatically declare the new disk as a spare and begin rebuilding the degraded volume. The auto declare spare function requires that the new disk be of equal or greater capacity than the failed disk. Auto declare also requires that the new disk have a different serial number than the failed disk. If you remove a drive from a system and reinstall the same drive in the same system, the auto declare will not declare the reinstalled disk as a spare.

•With a SAF-TE enclosure a bus scan occurs automatically when the drive is inserted. No manual intervention is required.

•For the Auto Declare Spare feature to work with an enclosure without SAF-TE support, a reboot or bus scan is required before the system will be able to claim the disk as a spare. See Section 4.3.9.3, “Bus Scan for more information on using the bus scan feature.

•When inserting a new drive into the enclosure to replace a failed drive, it may have the same SCSI ID as the failed drive.

5.1.5System Management

SRCU31 supports DMI and SNMP protocols. In addition, SRCU31 provides a local host monitor application referred to as RAID Monitor. See Section 4.2.1, “RAID Monitor.

5.1.6What is RAID?

Redundant Array of Independent Disks (RAID) refers to a method of organizing data on one or more physical disks to provide increased I/O performance and data protection. The different methods for organizing the data are referred to as RAID Levels. The RAID levels offered by Intel Server RAID Controller U3-1 are 0, 1, 5 and 10. A summary of RAID levels, their performance and protection can be found in Table 5-1. RAID levels examples are given in Section 5.2.9.

Intel® Server RAID Controller U3-1 User’s Manual Rev 1.0 5-5