As far as I know, not for the root fs which "normally" shouldn't be a problem since setting the chunk size is a performance tuning task and you typically don't do high load tasks against your root fs (Well I don't anyway). So, I'd suggest simply building a small root fs using the normal kick start methods, then elsewhere in your post section, manually create the raid device and file-system where you need to set the chunk size.
Also, this is sort of predicated by all of your nodes are exactly the same and have exactly the same (or very similar) workload.
From: kickstart-list-bounces redhat com [kickstart-list-bounces redhat com] on behalf of Jay Naikwadi [jnaikwadi asterdata com]
Sent: Wednesday, December 15, 2010 2:10 PM
To: kickstart-list redhat com
Subject: Re: RAID chunk size configuration from kickstart
Jay Naikwadi wrote:
Any suggestions about how this could be done ?