Bug#848944: grub-common: grub-probe fails for ZFS root pool on /dev/mapper device

Wed Dec 21 08:09:23 UTC 2016

this is a duplicate of #824974 and thus fixed in stretch/sid's grub2/2.02~beta3-3

maybe a backport of that one for jessie-backports would help you? since ZoL is only available via -backports as well..

alternatively, you could try to build jessie with the single patch setting the environment variable to get "zpool status -P" behaviour (or even just set ZPOOL_VDEV_NAME_PATH when calling update-grub, not sure if the grub binaries/scripts propagate or sanitize the environment).