A rather dirty but more straighforward way could be:
create an additional logical volume using all free extend.
Fill it with random data
release the extends again and grow the actual volume ...
Aside from that, afaik the lvm metadata is in the beginning of the
partition, so yes, if you are sure the extends are consecutive you could
find the right offset and just fill the area linear. But it might be a
little too risky.
Regards
-Sven
Wolfgang Sailer schrieb:
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Dear all!
It is generally recommended good practice to fill a device with /dev/urandom
before creating a LUKS encrypted device upon it. Fine, understood.
But how to do it in the following situation:
When I enlarge a LUKS volume, say by expanding the RAID or enlarging the
logvol (LVM partition) that hosts the LUKS volume, how can I then fill the
additional space with random data before enlarging the LUKS volume?
If the size before enlargement is x blocks can I then just
dd if=/dev/urandom of=/dev/logvol seek=x
?
How to make damn sure that dd starts at the right position and not before?
Should one refrain from filling the additional space?
Is there a parameter in "cryptsetup resize" that perhaps does the work for
me, like:
sudo cryptsetup --verbose --fill-with-dev-urandom resize LUKSNAME
regards, Wolfgang
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