3Ware 9550SX-4LP User Guide - Page 117

RAID 0, Single Disk, and Spare Disk., Configuring a Unit in 3DM, Type. - 12 raid 5 performance

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3DM 2 Reference Figure 44. Configuring a Unit in 3DM For more detailed instructions, see "Configuring a New Unit" on page 128. Type. The drop-down list lists the possible RAID configurations for the drives selected in the list of Available Drives. Available configurations may include RAID 0, RAID 1, RAID 5, RAID 10, RAID 50, Single Disk, and Spare Disk. For information about these configurations, see "Available RAID Configurations" on page 6. When you are configuring a RAID 50 with twelve drives, an additional field appears, in which you select the number of drives per subunit-3, 4, or 6. Figure 45. Configuring a RAID 50 with 12 Drives Name. You can enter a name for the unit. Stripe. The drop-down list of stripe sizes lists the possible stripe sizes for the configuration you selected in the RAID level drop-down. The default stripe size of 64KB will give the best performance with applications that have many sequential reads and writes. A larger stripe size will give better performance with applications that have a lot of random reads and writes. In general, the smaller the stripe size, the better the sequential I/O www.3ware.com 107

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3DM 2 Reference
www.3ware.com
107
Figure 44.
Configuring a Unit in 3DM
For more detailed instructions, see “Configuring a New Unit” on page 128.
Type.
The drop-down list lists the possible RAID configurations for the drives
selected in the list of Available Drives. Available configurations may include
RAID 0, RAID 1, RAID 5, RAID 10, RAID 50, Single Disk, and Spare Disk.
For information about these configurations, see “Available RAID
Configurations” on page 6.
When you are configuring a RAID 50 with twelve drives, an additional field
appears, in which you select the number of drives per subunit—3, 4, or 6.
Figure 45.
Configuring a RAID 50 with 12 Drives
Name.
You can enter a name for the unit.
Stripe.
The drop-down list of stripe sizes lists the possible stripe sizes for the
configuration you selected in the RAID level drop-down.
The default stripe size of 64KB will give the best performance with
applications that have many sequential reads and writes. A larger stripe size
will give better performance with applications that have a lot of random reads
and writes. In general, the smaller the stripe size, the better the sequential I/O