>>> Digimer schrieb am 16.04.2017 um 20:17 in Nachricht
<12cde13f-8bad-a2f1-6834-960ff3afc...@alteeve.ca>:
> On 16/04/17 01:53 PM, Eric Robinson wrote:
>> I was reading in "Clusters from Scratch" where Beekhof states, "Some would
> argue that two-node clusters are always pointless, but that is an
>
> This isn't the first time this has come up, so I decided to elaborate on
> this email by writing an article on the topic.
>
> It's a first-draft so there are likely spelling/grammar mistakes.
> However, the body is done.
>
> https://www.alteeve.com/w/The_2-Node_Myth
>
An excellent article
.. device_block & device_unblock in dmesg.
and I see that the LVM resource would fail.
This to me seems to happen randomly, or I fail to spot a
pattern.
Shared storage is a sas3 enclosure.
I believe I follow docs on LVM to the letter. I don't know
what could be the problem.
would you sugges
Dne 17.4.2017 v 17:28 Ken Gaillot napsal(a):
On 04/13/2017 01:11 PM, Scott Greenlese wrote:
Hi,
I need to remove some nodes from my existing pacemaker cluster which are
currently unbootable / unreachable.
Referenced
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/
On 18/04/17 07:31 AM, lejeczek wrote:
> .. device_block & device_unblock in dmesg.
>
> and I see that the LVM resource would fail.
> This to me seems to happen randomly, or I fail to spot a pattern.
>
> Shared storage is a sas3 enclosure.
> I believe I follow docs on LVM to the letter. I don't kn
On 18/04/17 04:08 AM, Christine Caulfield wrote:
>
>>
>> This isn't the first time this has come up, so I decided to elaborate on
>> this email by writing an article on the topic.
>>
>> It's a first-draft so there are likely spelling/grammar mistakes.
>> However, the body is done.
>>
>> https://ww
On 17/04/17 09:51 -0500, Ken Gaillot wrote:
> On 04/13/2017 07:04 AM, Jan Pokorný wrote:
>> On 03/04/17 09:47 -0500, Ken Gaillot wrote:
>>> On 04/03/2017 02:12 AM, Ulrich Windl wrote:
>>> Ken Gaillot schrieb am 01.04.2017 um 00:43 in
>>> Nachricht
<981d420d-73b2-3f24-a67c-e9c66dafb..
On 18/04/17 03:47 AM, Ulrich Windl wrote:
Digimer schrieb am 16.04.2017 um 20:17 in Nachricht
> <12cde13f-8bad-a2f1-6834-960ff3afc...@alteeve.ca>:
>> On 16/04/17 01:53 PM, Eric Robinson wrote:
>>> I was reading in "Clusters from Scratch" where Beekhof states, "Some would
>
>> argue that two-
On 18/04/17 10:00 AM, Digimer wrote:
> On 18/04/17 03:47 AM, Ulrich Windl wrote:
> Digimer schrieb am 16.04.2017 um 20:17 in Nachricht
>> <12cde13f-8bad-a2f1-6834-960ff3afc...@alteeve.ca>:
>>> On 16/04/17 01:53 PM, Eric Robinson wrote:
I was reading in "Clusters from Scratch" where Beekho
On 18/04/17 14:45, Digimer wrote:
On 18/04/17 07:31 AM, lejeczek wrote:
.. device_block & device_unblock in dmesg.
and I see that the LVM resource would fail.
This to me seems to happen randomly, or I fail to spot a pattern.
Shared storage is a sas3 enclosure.
I believe I follow docs on LVM
On 04/18/2017 02:47 AM, Ulrich Windl wrote:
Digimer schrieb am 16.04.2017 um 20:17 in Nachricht
> <12cde13f-8bad-a2f1-6834-960ff3afc...@alteeve.ca>:
>> On 16/04/17 01:53 PM, Eric Robinson wrote:
>>> I was reading in "Clusters from Scratch" where Beekhof states, "Some would
>
>> argue that tw
On 18/04/17 15:02, Digimer wrote:
> On 18/04/17 10:00 AM, Digimer wrote:
>> On 18/04/17 03:47 AM, Ulrich Windl wrote:
>> Digimer schrieb am 16.04.2017 um 20:17 in Nachricht
>>> <12cde13f-8bad-a2f1-6834-960ff3afc...@alteeve.ca>:
On 16/04/17 01:53 PM, Eric Robinson wrote:
> I was readin
>>> lejeczek schrieb am 18.04.2017 um 16:14 in Nachricht
:
>
> On 18/04/17 14:45, Digimer wrote:
>> On 18/04/17 07:31 AM, lejeczek wrote:
>>> .. device_block & device_unblock in dmesg.
>>>
>>> and I see that the LVM resource would fail.
>>> This to me seems to happen randomly, or I fail to spot
On 04/18/2017 09:14 AM, lejeczek wrote:
>
>
> On 18/04/17 14:45, Digimer wrote:
>> On 18/04/17 07:31 AM, lejeczek wrote:
>>> .. device_block & device_unblock in dmesg.
>>>
>>> and I see that the LVM resource would fail.
>>> This to me seems to happen randomly, or I fail to spot a pattern.
>>>
>>>
Hi,
i'm currently establishing a two node cluster. Each node is a HP server with an
ILO card.
I can fence both of them, it's working fine.
But what is if the ILO does not work correctly ? Then fencing is not possible.
I also have a switched PDU from APC. Each server has two power supplies.
Curr
Ken Gaillot writes:
> On 04/13/2017 11:11 AM, Ferenc Wágner wrote:
>
>> I encountered several (old) statements on various forums along the lines
>> of: "the CIB is not a transactional database and shouldn't be used as
>> one" or "resource parameters should only uniquely identify a resource,
>> n
On 18/04/17 11:07 AM, Lentes, Bernd wrote:
> Hi,
>
> i'm currently establishing a two node cluster. Each node is a HP server with
> an ILO card.
> I can fence both of them, it's working fine.
> But what is if the ILO does not work correctly ? Then fencing is not possible.
Correct. If you only ha
On 04/18/2017 02:47 AM, Ulrich Windl wrote:
> IMHO: a valid cluster software works starting at 1 node, then per induction
> also for n+1 nodes.
I'm not sure what a valid fencing configuration would be in a one-node
cluster, and since -- all together now -- YOU HAVE TO HAVE FENCING!..
Perhaps you
My thanks to both Ken Gaillot and Tomas Jelinek for the workaround. The
procedure(s) worked like a champ.
I just have a few side comments / observations ...
First - Tomas, in the bugzilla you show this error message on your cluster
remove command, directing you to use the --force option:
[roo
If your 1 node cluster hits a split brain situation, you have got bigger
problems!
Unless you can guarantee that a cluster can not encounter a split brain (to the
same degree a 1 node cluster can!), any cluster solution worth installing
should have a robust fencing method. Preferably more than
On 04/18/2017 11:46 AM, Ferenc Wágner wrote:
> Ken Gaillot writes:
>
>> On 04/13/2017 11:11 AM, Ferenc Wágner wrote:
>>
>>> I encountered several (old) statements on various forums along the lines
>>> of: "the CIB is not a transactional database and shouldn't be used as
>>> one" or "resource para
On 04/18/2017 06:15 PM, Alex Bruneau wrote:
> Therein lies the true value: what happens when something really
> messes up? How much do you really want to drive to the DC at 3am?
Yes, exactly: what happens when something really messes up? Will you
lose a cool million bucks or will a few people get
On 18/04/17 07:55 PM, Dimitri Maziuk wrote:
> On 04/18/2017 06:15 PM, Alex Bruneau wrote:
>
>> Therein lies the true value: what happens when something really
>> messes up? How much do you really want to drive to the DC at 3am?
>
> Yes, exactly: what happens when something really messes up? Will
On 04/18/2017 07:05 PM, Digimer wrote:
> Certainly, the people creating the software have to assume that a
> split-brain is devastating. Same for people who teach others and people
> who write documentation.
split brain is devastating when you're drbd. When you're a
mere floating ip, assume make
On 18/04/17 08:50 PM, Dimitri Maziuk wrote:
> On 04/18/2017 07:05 PM, Digimer wrote:
>
>> Certainly, the people creating the software have to assume that a
>> split-brain is devastating. Same for people who teach others and people
>> who write documentation.
>
> split brain is devastating when y
>>> "Lentes, Bernd" schrieb am 18.04.2017
um
17:07 in Nachricht
<1277815831.15615646.1492528035457.javamail.zim...@helmholtz-muenchen.de>:
> Hi,
>
> i'm currently establishing a two node cluster. Each node is a HP server with
> an ILO card.
> I can fence both of them, it's working fine.
> But wh
>>> Ferenc Wágner schrieb am 18.04.2017 um 18:46 in Nachricht
<87tw5l64v0@lant.ki.iif.hu>:
> Ken Gaillot writes:
>
>> On 04/13/2017 11:11 AM, Ferenc Wágner wrote:
>>
>>> I encountered several (old) statements on various forums along the lines
>>> of: "the CIB is not a transactional databa
>>> Digimer schrieb am 18.04.2017 um 19:08 in Nachricht
<26e49390-b384-b46e-4965-eba5bfe59...@alteeve.ca>:
> On 18/04/17 11:07 AM, Lentes, Bernd wrote:
>> Hi,
>>
>> i'm currently establishing a two node cluster. Each node is a HP server
with
> an ILO card.
>> I can fence both of them, it's worki
>>> Dimitri Maziuk schrieb am 18.04.2017 um 19:36 in
Nachricht <20627eba-69f7-fe53-a4a2-0183fe24c...@bmrb.wisc.edu>:
> On 04/18/2017 02:47 AM, Ulrich Windl wrote:
>
>> IMHO: a valid cluster software works starting at 1 node, then per induction
>> also for n+1 nodes.
>
> I'm not sure what a valid
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