User guide

Compaq StorageWorks RAID Array 4000 User Guide
This screen first displays the maximum size logical drive that can be created
for your drive array. You can reduce this amount if you want to create more
than one logical drive on the array. To reduce the size, type in the number or
drag the pointer to the left. Fine-tune the size with the arrow buttons to the left
of the scale.
Stripe size refers to the amount of data stored on each physical drive in one
stripe of a logical drive. Each RAID level has a default value (Table 6-1) plus
a range of supported sizes. The default values were determined to provide
optimum performance for that RAID level in many applications. However,
your application may benefit from setting the stripe size to a different value.
To select a stripe size other than the default, click the down arrow next to the
current stripe size and select from those available.
Raid 0 128 8, 16, 32, 64, ,
256
RAID 1/RAID 0+1 128 8, 16, 32, 64, ,
256
RAID 4 16 8, , 32, 64*
RAID 5 16 8, , 32, 64*
*RAID 4 and 5 do not support stripe sizes larger than 64KB per drive.
To change the RAID level and stripe size without loss of data or system
disruption, use the Online RAID Level and Stripe Size Migration screen. From
this screen, you can reconfigure a currently configured logical drive to a new
fault tolerance (RAID) level or a new stripe size.