3Ware 3W-6800 User Guide - Page 19

RAID 10 arrays maximize performance and fault tolerance, Storage Switches.

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Introduction tial read requests. For the sequential requests generated when accessing large files, both drives are used, with the heads simultaneously reading alternating sections of the file. For the smaller random transactions, the data is read from a single optimal drive head. Drives can be dynamically profiled, specifically for your brand of drive, during installation to customize the stripe size (for RAID configurations offering variable striping) and seek algorithms. RAID 10 arrays maximize performance and fault tolerance When drives are configured as a striped mirrored array, the disks are configured using both RAID 0 and RAID 1 techniques, thus the name RAID 10 (see Figure 3). A minimum of four drives are required to use this technique. The first two drives are mirrored as a fault tolerant array using RAID 1. The third and fourth drives are mirrored as a second fault tolerant array using RAID 1. The two mirrored arrays are then grouped as a striped RAID 0 array using a two tier structure. Higher data transfer rates are achieved by leveraging TwinStor and striping (64K, 128K, 256K, 512K or 1M) the arrays. RAID 10 is available on the four and eight port Escalade Storage Switches. Figure 3. RAID 10 Configuration Example www.3ware.com 9

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Introduction
www.3ware.com
9
tial read requests. For the sequential requests generated when
accessing large files, both drives are used, with the heads simulta-
neously reading alternating sections of the file. For the smaller ran-
dom transactions, the data is read from a single optimal drive head.
Drives can be dynamically profiled, specifically for your brand of
drive, during installation to customize the stripe size (for RAID
configurations offering variable striping) and seek algorithms.
RAID 10 arrays maximize performance and fault
tolerance
When drives are configured as a striped mirrored array, the disks
are configured using both RAID 0 and RAID 1 techniques, thus the
name RAID 10 (see Figure 3). A minimum of four drives are
required to use this technique. The first two drives are mirrored as a
fault tolerant array using RAID 1. The third and fourth drives are
mirrored as a second fault tolerant array using RAID 1. The two
mirrored arrays are then grouped as a striped RAID 0 array using a
two tier structure. Higher data transfer rates are achieved by lever-
aging TwinStor and striping (64K, 128K, 256K, 512K or 1M) the
arrays. RAID 10 is available on the four and eight port Escalade
Storage Switches.
Figure 3.
RAID 10 Configuration Example