User Manual

578
Vess R2000 Series Product Manual Promise Technologies
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 available Stripe Sizes are 64 KB, 128 KB, 256 KB, 512 KB, and 1 MB. 64 KB is the default. 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data-base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.
sectOr size
A sector is the smallest addressable area on a physical drive. Sector size refers to the number of data bytes a
sector can hold. A smaller sector size is a more efcient use of a physical drive’s capacity. 512 bytes (512 B) is
the most common sector size, and the default in WebPAM PROe.
Preferred cOntrOller id
When you create a logical drive using the Advanced method of disk array creation, you can specify the Preferred
Controller ID: