HP 226593-B21 Smart Array 5i Plus Controller and Battery Backed Write Cache En - Page 48

Stripe Size, Logical Drive Size, Table 7-2, Supported Stripe Sizes for a Given RAID Level

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Configuring an Array The Stripe Size box has a drop-down menu that lets you select the width of a data stripe. (This width corresponds to the size of a data block on each hard drive in the logical volume, as described in Appendix D). Each RAID level supports several stripe widths (Table 7-2); the default stripe size initially displayed by ACU is chosen for optimum performance under the most common operating conditions. Table 7-3 suggests how to optimize the stripe width for different types of application. Table 7-2: Supported Stripe Sizes for a Given RAID Level Fault Tolerance Level RAID 0 RAID 1 or 1+0 RAID 5 Supported Stripe Sizes (KB) 8, 16, 32, 64, 128, 256 8, 16, 32, 64, 128, 256 8, 16, 32, 64 Default (KB) 128 128 16 Table 7-3: Optimum Stripe Size for a Given Application Type of Server Application Mixed read/write Mainly sequential read (such as audio/video applications) Mainly write (such as image manipulation applications) Suggested Stripe Size Change Accept the default value Use larger stripe sizes for best performance Use smaller stripes for RAID 5 Use larger stripes for RAID 0, RAID 1+0, RAID 1 The Logical Drive Size box shows how much drive capacity is available on the selected logical drive when using the chosen RAID level. The left side of the slider scale shows how much drive capacity is available for data storage, while the right side indicates how much capacity is required for storing parity or mirrored information. (RAID overhead is not needed for RAID 0.) The default logical drive size first shown in this box is the maximum available for your drive array. To create more than one logical drive on the array, reduce the logical drive size by typing a smaller number in the scroll box. ACU allows you to create up to 32 logical drives per array. 7-14 Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide

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Configuring an Array
7-14
Compaq Smart Array 5i Plus Controller and Battery Backed Write Cache Enabler User Guide
The
Stripe Size
box has a drop-down menu that lets you select the width of a data
stripe. (This width corresponds to the size of a data block on each hard drive in the
logical volume, as described in Appendix D).
Each RAID level supports several stripe widths (Table 7-2); the default stripe size
initially displayed by ACU is chosen for optimum performance under the most
common operating conditions. Table 7-3 suggests how to optimize the stripe width
for different types of application.
Table 7-2:
Supported Stripe Sizes for a Given RAID Level
Fault Tolerance Level
Supported Stripe Sizes (KB)
Default (KB)
RAID 0
8, 16, 32, 64, 128, 256
128
RAID 1 or 1+0
8, 16, 32, 64, 128, 256
128
RAID 5
8, 16, 32, 64
16
Table 7-3:
Optimum Stripe Size for a Given Application
Type of Server Application
Suggested Stripe Size Change
Mixed read/write
Accept the default value
Mainly sequential read (such
as audio/video applications)
Use larger stripe sizes for best
performance
Mainly write (such as image
manipulation applications)
Use smaller stripes for RAID 5
Use larger stripes for RAID 0, RAID 1+0,
RAID 1
The
Logical Drive Size
box shows how much drive capacity is available on the
selected logical drive when using the chosen RAID level. The left side of the slider
scale shows how much drive capacity is available for data storage, while the right
side indicates how much capacity is required for storing parity or mirrored
information. (RAID overhead is not needed for RAID 0.)
The default logical drive size first shown in this box is the maximum available for
your drive array. To create more than one logical drive on the array, reduce the
logical drive size by typing a smaller number in the scroll box. ACU allows you to
create up to 32 logical drives per array.