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Obviously, the stripe size defines the minimum amount of data that a RAID controller will distribute files across its hard drives, in my example, 64 kB. For example, if you selected a 64 kB stripe size and you store a 2 kB text file, this file will occupy 64 kB. The stripe size also defines the amount of storage capacity that will at least be occupied on a RAID partition when you write a file. If you will end of storing millions of text files, Word documents, small spreadsheets or similar small files, small stripe sizes will help to distribute all files across multiple drives to keep throughput high. However, this only works if the files stored or read are at least as large as an entire stripe. From this standpoint, it makes the most sense to select the largest stripe size available, especially if your hard drives are good at providing high throughput. A change from 32 to 64 kB can be measured, but isn’t typically noticeable.Ĭonventional hard drives deliver their best transfer performance when they read or write sequentially, repositioning the heads as little as possible. However, it can be important for servers, though differences will still only be noticeable between very small and very large stripes with certain applications. In fact, this feature is often overrated, as the performance changes are marginal on a typical gaming or office PC. The option to alter stripe sizes with on-board RAID controllers such as the Intel Southbridges ICH7R, ICH8R and ICH9R does not make much of a difference in the desktop space.
#HP RAID 6 PROFESSIONAL#
Typical options are 16, 32, 64 and 128 kB, but many professional RAID controllers also offer smaller stripe sizes, and some even support sizes as large as 256 kB.
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Most RAID controllers allow the user to define her or his favorite stripe size, because it alters the performance characteristics of a RAID array. It can be compared to the blocks (logical block addressing - LBA) on conventional hard drives. People often also refer to this as granularity or block size. A stripe is the smallest chunk of data within a RAID array that can be addressed.