Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 355
NVRAM, NVRAM present, NVRAM size, offline, patrol read, patrol read rate, product info, product name
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NVRAM Acronym for non-volatile random access memory. A storage system that does not lose the data stored on it when power is removed. NVRAM is used to store firmware and configuration data on the RAID controller. NVRAM present A controller property indicating whether an NVRAM is present on the controller. NVRAM size A controller property indicating the capacity of the controller's NVRAM. offline A drive is offline when it is part of a virtual drive but its data is not accessible to the virtual drive. patrol read A process that checks the drives in a storage configuration for drive errors that could lead to drive failure and lost data. The patrol read operation can find and sometimes fix any potential problem with drives prior to host access. This enhances overall system performance because error recovery during a normal I/O operation may not be necessary. patrol read rate The user-defined rate at which patrol read operations are run on a computer system. product info A drive property indicating the vendor-assigned model number of the drive. product name A controller property indicating the manufacturing name of the controller. RAID A group of multiple, independent drives that provide high performance by increasing the number of drives used for saving and accessing data. A RAID drive group improves input/output (I/O) performance and data availability. The group of drives appears to the host system as a single storage unit or as multiple virtual drives. Data throughput improves because several drives can be accessed simultaneously. RAID configurations also improve data storage availability and fault tolerance. Redundant RAID levels (RAID levels 1, 5, 6, 10, 50, and 60) provide data protection. RAID 0 Uses data striping on two or more drives to provide high data throughput, especially for large files in an environment that requires no data redundancy. RAID 00 Uses data striping on two or more drives in a spanned drive group to provide high data throughput, especially for large files in an environment that requires no data redundancy. B-7