On 10/29/2015 03:12 PM, Veit Wahlich wrote:
Hi,
is there a (preferred) method to determine whether a resource is
currently in dual-primary mode, e.g. show the active net-options?
I use "drbdadm net-options --protocol=C --allow-two-primaries <res>" to
active dual-primary mode temporarily for a resource and promote it on
the former secondary, so I can migrate a virtual machine backed by this
resource to another node. After migration has completed or failed, I
demote the resource on the machine that does not run the vm and
deactivate dual-primary mode with "drbdadm net-options
--allow-two-primaries=no <res>".
you may be interested by this:
https://github.com/taradiddles/cluster/blob/master/libvirt_hooks/qemu
I wrote it some time ago as a qemu hook before ending setting up a full
fledged cluster (pacemaker) with proper fencing, which rendered the
script useless. It worked pretty well though (it doesn't change the
"--allow-two-primaries" but you could easily add it if you end up using
the script).
For safety reasons, I would like to verify whether the resource is not
already resp. no longer in dual-primary mode, but I found no method to
obtain this information:
- /proc/drbd does not seem to contain this information
are you sure ? on my machine, cat /proc/drbd
version: 8.4.6 (api:1/proto:86-101)
GIT-hash: 9304f3b0995d97316d6bd4455ecbcf2963147ab4 build by
[email protected], 2015-10-03 16:07:33
10: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
ns:9850696 nr:7822820 dw:17672764 dr:10737789 al:151 bm:0 lo:0 pe:0 ua:0
ap:0 ep:1 wo:f oos:0
11: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
ns:977368 nr:16 dw:977384 dr:1143886 al:212 bm:0 lo:0 pe:0 ua:0 ap:0
ep:1 wo:f oos:0
a little sed magic and you're set up.
- neither the documented nor official hidden commands of drbdadm seem
to be able to return this information
what about:
$ drbdadm role vm-file
Primary/Primary
Primary/Primary
(resource vm-file here has 2 volumes)
Any idea appreciated.
Regards,
// Veit
regards,
ivan
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