Dell PowerEdge R760 PowerEdge RAID Controller S160 Users Guide - Page 12
Mirror rebuilding, Fault tolerance, Self-monitoring and reporting technology, Native Command Queuing
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Mirror rebuilding A RAID mirror configuration can be rebuilt after a new physical disk is inserted and the physical disk is designated as a hot spare. NOTE: The system does not have to be rebooted. Fault tolerance The following fault tolerance features are available with the PERC S160: ● Physical disk failure detection (automatic). ● Virtual disk rebuild using hot spares (automatic, if the hot spare is configured for this feature). ● Parity generation and checking (RAID 5 only). ● Hot-swap manual replacement of a physical disk without rebooting the system (only for systems with a backplane that allows hot-swapping). If one side of a RAID 1 (mirror) fails, data can be rebuilt by using the physical disk on the other side of the mirror. If a physical disk in RAID 5 fails, parity data exists on the remaining physical disks, which can be used to restore the data to a new replacement physical disk configured as a hot spare. If a physical disk fails in RAID 10, the virtual disk remains functional and data is read from the surviving mirrored physical disk(s). A single disk failure in each mirrored set can be sustained, depending on how the mirrored set fails. Self-monitoring and reporting technology The self-monitoring and reporting technology (SMART) feature monitors certain physical aspects of all motors, heads, and physical disk electronics to help detect predictable physical disk failures. Data on SMART compliant physical disks can be monitored to identify changes in values and determine whether the values are within the threshold limits. Many mechanical and electrical failures display some degradation in performance before failures. A SMART failure is also referred to as a predicted failure. There are numerous factors that are predicted as physical disk failures, such as a bearing failure, a broken read/write head, and changes in spin-up rate. In addition, there are factors related to read/write surface failures, such as seek error rate and excessive bad sectors. NOTE: For detailed information on SCSI interface specifications, see t10.org, and for detailed information on SATA interface specifications, see t13.org. Native Command Queuing Native Command Queuing (NCQ) is a command protocol used by SATA physical disks supported on the S160 controller. NCQ allows the host to provide multiple input/output requests to a disk simultaneously. The disk decides the order to process the commands to achieve maximum performance. NVMe PCIe SSD support S160 supports the NVMe PCIe SSD-including the NVMe PCIe SSD 2.5-inch Small Form Factor (SFF), NVMe PCIe SSD Adapter, and E.3 form factor drives. The S160 supports the NVMe PCIe SSD 2.5-inch SFF and the NVMe PCIe SSD Adapter in a RAID configuration. The NVMe PCIe SSD supports volume, non-RAID, RAID 0, RAID 1, RAID 5, and RAID 10. The S160 also supports the Prepare to remove feature to remove the non-RAID NVMe drive from a Dell OpenManage console. NOTE: The Prepare to Remove feature is currently unavailable for E3 drives by using the OpenManage Storage application. In UEFI HII mode, you can use the NVMe PCIe SSD option on the device settings page to view NVMe physical disk properties and perform blink or unblink operations. Drives Samsung PM1733/PM1735 S160 operating system driver 7.0.0.0012 S160 UEFI driver 7.0.0.0011 12 Physical Disks
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