You can upgrade an ext3 filesystem to ext4.  If you do that, make sure to 
recreate your initrd with ext4 support.  Otherwise you won't be able to boot.

Also, to get more community supported software repos for RHEL, use EPEL:
http://fedoraproject.org/wiki/EPEL

--
Kyle Gonzales
Sent from my mobile

On Apr 2, 2011, at 2:40 PM, Patrick Martin <[email protected]> wrote:

> Weird, I didn't see ext4 in the list of eligible filesystems.  Maybe I am 
> wrong.
> 
> I just started reading up on TRIM.  My whole drive is divided into a small 
> swap partition, and a single ext3
> filesystem mounted as /.
> 
> Reading up on TRIM, it seems fairly important that I be using ext4.  Is there 
> an easy way to migrate?
> Could I simply format my USB drive as ext4, then dd the filesystem over to 
> it?  Boot into Linux Rescue
> and make filesystem on the old drive and dd it all back?
> 
> What if I do nothing?
> 
> - Pat
> 
> > CC: [email protected]
> > From: [email protected]
> > Subject: Re: Adventures in Linux
> > Date: Sat, 2 Apr 2011 12:49:17 -0400
> > To: [email protected]
> > 
> > You want ext4 for the TRIM support for SSDs.
> > 
> > And thank you for your patronage. :-) RHEL5.6 has ext4 as a supported file 
> > system. Make sure to register your RHEL system with Red Hat Network to get 
> > your updates.
> 

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