Table of Contents
Advertisement
Pegasus3 Product Manual
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 specified when you create a logical drive. You can choose Stripe
Size directly when you use the Wizard Advanced Configuration 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 112 and "Creating a Logical
Drive Manually" on page 134.
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 fill their buffers.
• If your data retrieval consists of fixed 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 fixed 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.
177
Technology Background
Advertisement
Table of Contents
