Changing the /usr volume

opensuse 13.2
linux 3.16.7-7-desktop x86_64

Note: I posted this in the Applications forum. No joy there. One person suggested it might be an initrd problem but offered no details.

I recently purchased an Axiom SSD unit, 160GB. I partitioned it into two volumes, one for /usr, the other for / (root). I copied /usr using rsync:

OPTS='--recursive --one-file-system --links --stats --itemize-changes --quiet --delete --times -HAXS'; rsync ${OPTS} --log-file=${LOGFILE} /usr /mnt/usr1/

I thought that all I had to do then was modify /etc/fstab and restart. Not so. It became unbootable. I had to use the Rescue Disk to change the fstab settings back to the previous.

/dev/disk/by-id/scsi-SSEAGATE_ST336753LW_3HX0G0GM000073370Y4S-part3 /usr ext4 acl,user_xattr 1 2
# /dev/disk/by-id/scsi-SSEAGATE_ST336753LW_3HX0G0GM000073370Y4S-part3 /mnt/usr1  ext4  acl,user_xattr 1 2

/dev/disk/by-id/ata-Axiom_Signature_Series_III_SSD_AX150206AS1706441-part2 /mnt/usr1 xfs  defaults 1 2
# /dev/disk/by-id/ata-Axiom_Signature_Series_III_SSD_AX150206AS1706441-part2 /usr xfs defaults 1 2

So. What did I miss when copying /usr and changing mount points?