Can't mount ext4 logical vol under new kernel

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http://forums.fedoraforum.org – Hi everyone. I'm new to Fedora, but not new to Linux. I have 250Gb, 500Gb and 1Tb drives concatenated together as one volume group (span) with a logical volume (spanvol). Under kernel it mounts totally fine. However, under, I get this:- [root@undertaker ~]# mount -t ext4 /dev/mapper/span-spanvol /home mount: wrong fs type, bad option, bad superblock on /dev/mapper/span-spanvol, missing codepage or helper program, or other error (could this be the IDE device where you in fact use ide-scsi so that sr0 or sda or so is needed?) In some cases useful info is found in syslog - try dmesg | tail or so [root@undertaker ~]# uname -a Linux undertaker.rigbyfam.net #1 SMP Sat Nov 21 15:57:45 EST 2009 x86_64 x86_64 x86_64 GNU/Linux Boot up with the older kernel, and no problems mounting. I update the kernel with yum command line (NOT yumex, I believe there's some issues with that) - and I've removed and reinstalled the kernel a couple of times, not made any difference. Any help would be appreciated... thanks! (HowTos)