HP 166207-B21 Advanced Data Guarding User Guide - Page 23

Optimizing the Stripe Size, Table 3-1, Available Stripe Sizes, Optimum Stripe Size - smart array 32

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3-8 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide 4. Click the Settings button in the Controller section on the right side of the Main ACU screen. 5. In the Accelerator Ratio section of the Controller Settings screen that is displayed, either click a check box by one of the choices offered or enter a percentage in one of the fields. 6. Click the Done button. 7. Choose Save Configuration from the Controller menu. 8. Choose Exit from the Controller menu. You may also need to change the stripe size. This is described in the following section. Optimizing the Stripe Size Stripe size is the size of the data block written to a hard drive in each stripe of the logical drive. Table 3-1 summarizes the stripe sizes available for each of the fault tolerance methods. The default stripe size gives acceptable performance in most circumstances. When high performance is important, you can modify the stripe size according to the information in Table 3-2. Fault Tolerance Method RAID 0 RAID 1 or 0+1 RAID 5 or RAID ADG Table 3-1 Available Stripe Sizes Available Stripe Sizes (kB) 128, 256 8, 16, 32, 64, 128, 256 8, 16, 32, 64 Default Size (kB) 128 128 16 Table 3-2 Optimum Stripe Size Type of Server Application Mixed read/write Mainly read (such as database or Internet applications) Mainly write (such as image manipulation applications) Suggested Stripe Size Change Accept the default value Larger stripe sizes work best Smaller stripes for RAID 5, RAID ADG Larger stripes for RAID 0, RAID 0+1, RAID 1

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3-8
Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide
4.
Click the Settings button in the Controller section on the right side of the
Main ACU screen.
5.
In the Accelerator Ratio section of the Controller Settings screen that is
displayed, either click a check box by one of the choices offered or enter
a percentage in one of the fields.
6.
Click the Done button.
7.
Choose Save Configuration from the Controller menu.
8.
Choose Exit from the Controller menu.
You may also need to change the stripe size. This is described in the following
section.
Optimizing the Stripe Size
Stripe size is the size of the data block written to a hard drive in each stripe of
the logical drive. Table 3-1 summarizes the stripe sizes available for each of
the fault tolerance methods. The default stripe size gives acceptable
performance in most circumstances. When high performance is important, you
can modify the stripe size according to the information in Table 3-2.
Table 3-1
Available Stripe Sizes
Fault Tolerance Method
Available Stripe Sizes (kB)
Default Size (kB)
RAID 0
128, 256
128
RAID 1 or 0+1
8, 16, 32, 64, 128, 256
128
RAID 5 or RAID ADG
8, 16, 32, 64
16
Table 3-2
Optimum Stripe Size
Type of Server Application
Suggested Stripe Size Change
Mixed read/write
Accept the default value
Mainly read (such as database or
Internet applications)
Larger stripe sizes work best
Mainly write (such as image
manipulation applications)
Smaller stripes for RAID 5, RAID ADG
Larger stripes for RAID 0, RAID 0+1, RAID 1