On 12/02/16 12:34, Adam Goryachev wrote:
Hi,
Can anyone advise the steps needed to "prepare" my LV which is
currently on-disk format v08 so that I can upgrade it to v09 with
additional sync nodes?
ie,
lvextend -L+xx /dev/vg0/drbdspace
How to calculate xx ?
Wow, after lots of searching, I ask the question, and two minutes later,
I found half the answer (sorry for that)
So, I now see:
http://drbd.linbit.com/users-guide-9.0/ch-internals.html#s-metadata
Which shows a formula for calculating the metadata as:
C / 2^18 X 8 X N + 72
Where C is the device size in sectors and N is the number of peers.
However, I would guess some of that space is already reserved, for the
two peers I already have? Also, the rest of the questions still apply,
on how will DRBD find the old signature at a different offset to normal,
etc...
drbdadm -v --max-peers=<N> create-md <resources>
If the size of the device has changed, will drbdadm still "find" the
old v08 signature that it needs to update? I think the DRBD signature
is at the end of the device, but now the end of the device has changed....
Also, I wasn't able to find much (any) information on how to migrate
to drbdmanage. It almost seems like it would be a completely manual
process, managing the old style config files manually, creating the
new drbdmanage based device, then migrate the data from the old to the
new, etc... Ideally, there would be some automated solution to import
configs and devices/etc, and have drbdmanage do the
"conversion/migration" itself.
Finally, just how "stable/reliable" is v9? How do you use it, what
issues have you seen? Is it faster/slower or more stable/less stable
etc than v8.4?
Regards,
Adam
--
Adam Goryachev Website Managers www.websitemanagers.com.au
--
Adam Goryachev Website Managers www.websitemanagers.com.au
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