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Bug#614768: should detect when embed area is too small for GRUB

Package: partman-zfs
Version: 5
Severity: grave
Tags: help

When partitioning is not done from scratch (i.e. when used partitions
already existed), the pre-existing embed area is used instead of a
new one with the usual size (1 MiB). Usually it's 31 kiB instead.

If ZFS is used for the root partition, and embed area is too small to
boot from ZFS (as is the case with 31 kiB), installing GRUB will fail
later on.

We need some kind of warning in partitioning phase, but I'm unsure how
can this situation be detected.  Some help would be appreciated.

-- System Information:
Debian Release: 6.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.37-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=ca_AD.utf8, LC_CTYPE=ca_AD.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

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