Because the drives still present themselves as many separate drives to the kernel, it’s harder to boot properly from a software RAID. you might not get double-speed reading from a mirrored array, but implementations vary. It may not be able to combine reads the way a hardware RAID could, i.e. The computer has to do all its own processing, so there may be some performance cost there. Software RAID on the other hand takes several devices already apparent to the OS and just accesses them through special routines, so they’re treated as one device. – Dedicated cache memory on controller Software RAID – Manages RAID subsystem independent from host Once configured, the separate drives act like one device to the OS that you could do anything to you’d do with a normal drive, including boot from. This card is either configured through BIOS extensions(you may get an extra ‘hit ESC to setup’ message on boot) or through proprietary utilities. Hardware RAID is handled by a specialized RAID controller card which does its own processing to make many devices act like one. In this post I will record my experiences with the software and hardware RAID. Hardware RAID costs more, but will be free of software RAID's performance limitations. Data in RAID is distributed across one of several channels, and is known as the RAID Level, depending on the requirement of the RAID parent and performance.Ĭhoosing between software RAID and hardware RAID depends on what you need to do and cost. Multiple physical disk drives comprise components into one logical unit. RAID is a technology used to increase the performance and reliability of data storage. RAID ( Redundant Array of Independent Disks)
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