After doing a kernel upadate and rebooting NSS is not working.

Server is SLES10, XEN guest running one NSS Pool and Volume,
Guest kernel
Host kernel

In the syslog of the Guest I see lots of
kernel device-mapper dm-linear device lookup failed
kernel device-mapper error adding target to table

rcnovell-nss restart reproduces the above in syslog.
The result of rcnovell-nss is
Mount: wrong fs type bad option, bad superblock on volume
missing codepage or other error

I found some more updates today which I also applied, seeing an NSS
update, still no change.

Is this because of the kernel update? All the volumes are disk based
not file based.

Thanks, Paul.