The /var partition was full due to Redis using 1.6 GByte in /var/lib/redis.

After verifying that using role::labs::lvm::mnt wouldn't cause any existing partition to be overwritten, I tried to use it with "$lvm_mount_point = /var/lib/redis", but in modules/labs_lvm/manifests/volume.pp this defines a file resource with "ensure => directory" that collides with a file resource with more detailed parameters in modules/redis/manifests/init.pp. I /think/ that volume.pp's file resource should be replaced with a "resource collector" ("User <| title == 'luke' |>").

Once that is done, we should consider defining the partitions in tools::redis so they don't get lost and can be smaller than the whole 68 GBytes that are allocated at the moment.

I should have added what /worked/ :-): Setting $lvm_mount_point to "/var/lib", running Puppet (leaves an empty /var/lib), "umount /var/lib && mv -i /var/lib /var/lib2 && puppetd -tv && mv -i /var/lib2/* /var/lib/ && rmdir /var/lib2" and a reboot for good measure.