What is gstripe ?

[bashr]

Fluffles wrote:
> concurrency. It's very important to select a high stripe size though; if
> you lower the stripesize to say 16KB the parallellisation effect will be
> almost gone:
> 

How do you decide what stripe size to use?  Are there handy 
rules-of-thumb?  I must have used the default stripe size when setting 
up gstripe here, 4096.  There are two gstripes here, which are then 
gmirrored.  Are there similar effects of gmirror sector size?