Promise Technology Pegasus32 R6 User Manual

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Promise Technology Pegasus32 R4/R6/R8
Stripe Size
Stripe Size, also called “Stripe Block Size,” refers to the size of the data blocks written to, and read
from,thephysicaldrives.StripeSizeisspeciedwhenyoucreatealogicaldrive.YoucanchooseStripe
SizedirectlywhenyouusetheWizardAdvancedCongurationfunctiontocreatealogicaldrive.
You cannot change the Stripe Size of an existing logical drive. You must delete the logical drive and
create a new one.
The default stripe size is 128 KB. When you create your logical drive using the Wizard Advanced option
or you create a logical drive manually, you can choose a stripe size of 64 KB, 128 KB, 256 KB, 512 KB,
and 1 MB.
See “Creating a Disk Array and Logical Drive with the Wizard” on page 244 and “Creating a Logical
Drive Manually” on page 266.
There are two issues to consider when choosing the Stripe Size:
• You should choose a Stripe Size equal to, or smaller than, the smallest cache buffer found on any
physical drive in the disk array. Selecting a larger value slows read/write performance because
physicaldriveswithsmallercachebuffersneedmoretimeformultipleaccessestolltheirbuffers.
• Ifyourdataretrievalconsistsofxeddatablocks,suchaswithsomedatabaseorvideo
applications, then you should choose that size as your Stripe Size.
Ifyoudonotknowthecachebufferorxeddatablocksizes,choose64KBasyourStripeSize.
Generally speaking,
• Email, POS, and web servers prefer smaller stripe sizes.
• Video and database applications prefer larger stripe sizes.

Promise Technology Pegasus32 R6 Specifications

General

Brand	Promise Technology
Model	Pegasus32 R6
Category	Storage
Language	English