On Fri, 30 Mar 2012, Alexander Best wrote:
i have a question regarding a label for a swap partition. when should i do the
labeling? after or before creating the partition scheme?
when i label before creating the partition scheme, likes this:
glabel label -v swap /dev/da0
gpart create -s GPT /dev/da0
i get the following warning:
GEOM: da1: the secondary GPT header is not in the last LBA.
which is obvious, because the label is being written into the last LBA and thus
the backup GPT header gets written into the last-1 LBA.
Right. Don't do that, the GPT backup header needs to be at the end of
the physical device. If you're using that whole disk for swap, there's
no need for a partition anyway.
if i create the partitioning scheme before labeling the device, like this:
gpart create -s GPT /dev/da0
glabel label -v swap /dev/da0
or
gpart create -s GPT /dev/da0
gpart add -t freebsd-swap /dev/da0
glabel label -v swap /dev/da0p1
the label gets written into da0 or da0p1 and is at constant risk of being
overwritten by userdata.
No. The swap device entered in /etc/fstab would be /dev/label/swap,
which is one block smaller than da0p1. That's the last-block metadata,
it's safe.
But if the whole disk is for swap, skip the partitioning entirely.
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