3Ware 7000-2 User Guide - Page 23

3Ware 7000-2 - Escalade RAID Controller Manual

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Introduction arrays. RAID 10 is available on the four, eight, and twelve port Escalade ATA RAID Controllers. Figure 3. RAID 10 Configuration Example Raid 5 arrays optimize performance, fault tolerance, high capacity and storage efficiency The RAID 5 configuration features the data striping of RAID 0 combined with the parity of RAID 4. Using a simple parity (exclusive OR) function, RAID 5 can tolerate the loss of one drive. Parity information is distributed across all drives rather than being concentrated on a single disk (see Figure 4). This avoids throughput loss due to contention for the parity drive. You can use hot spares to rebuild a failed drive "on-the-fly". RAID 5 capacity = size of smallest drive × (number of drives - 1). In addition, the array's storage efficiency increases with the number of disks; from 66.7 % for 3 drives to 87.5 % for 8 drives: storage efficiency = (number of drives -1) ÷ (number of drives). Unlike all other RAID configurations that offer data striping, except for RAID 1, RAID 5 stripe size is limited to 64k. www.3ware.com 23

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Introduction
www.3ware.com
23
arrays. RAID 10 is available on the four, eight, and twelve port
Escalade ATA RAID Controllers.
Figure 3.
RAID 10 Configuration Example
Raid 5 arrays optimize performance, fault
tolerance, high capacity and storage
efficiency
The RAID 5 configuration features the data striping of RAID 0
combined with the parity of RAID 4. Using a simple parity (exclu-
sive OR) function, RAID 5 can tolerate the loss of one drive. Parity
information is distributed across all drives rather than being con-
centrated on a single disk (see Figure 4). This avoids throughput
loss due to contention for the parity drive. You can use hot spares to
rebuild a failed drive “on-the-fly”.
RAID 5 capacity = size of smallest drive
×
(number of drives - 1).
In addition, the array’s storage efficiency increases with the number
of disks; from 66.7 % for 3 drives to 87.5 % for 8 drives: storage
efficiency = (number of drives -1)
÷
(number of drives).
Unlike all other RAID configurations that offer data striping, except
for RAID 1, RAID 5 stripe size is limited to 64k.