For small operations, independent disks are better, making mirroring, or striping with block sizes larger than that of the file, ideal. For raw throughput on bulk files, striping will be the fastest, and larger block sizes will reduce the load on the controller, further improving performance to a point. The performance values in the table above are optimal conditions, but will differ depending on whether you want to optimize for throughput or operations. The choice of which RAID level to choose depends on the application it will be used for. Two blocks on each stripe are reserved for parity, which can be used to calculate missing data in the event of a drive failure. One block on each stripe is reserved for parity, which can be used to calculate missing data in the event of a drive failure. This is a nested array where a RAID 0 array is made using RAID 1 arrays This is a nested array where a RAID 1 array is made using RAID 0 arrays ![]() Pools disk space, and ensures data is stored on at least two disks. Provides improved read performance and redundancy, but no additional storage ![]() ![]() Provides improved performance and additional storage, but no redundancy. 2.11 Software Raid Online Capacity Expansion (OCE) (for raid 5 with XFS).
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