Which of the two setups is preferable depends on the details of the application in question, such as whether or not spare disks are available, and how they should be spun up. A single-drive failure in a RAID 0+1 configuration results in one of the lower-level stripes completely failing, and the top-level mirror entering degraded mode. A single-drive failure in a RAID 10 configuration results in one of the lower-level mirrors entering degraded mode, but the top-level stripe performing normally (except for the performance hit). RAID 10 is distinct from RAID 0+1, which consists of a top-level RAID 1 mirror composed of high-performance RAID 0 stripes directly across the physical hard disks. RAID 10 – Take a number of RAID 1 mirrorsets and stripe across them RAID 0 style.RAID 6 – Like RAID 5, but with two parity segments per stripe. RAID 5 – Like RAID 4, but with the parity distributed across all devices.RAID 4 – Like RAID 0, but with an extra device for the parity.MD can handle devices of different lengths, the extra space on the larger device is then not striped.
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