[DRBD-user] Best practice: drbd+lvm+gfs2+dm-crypt on dual primary

Patrick Prilisauer prilisauer at googlemail.com
Mon Feb 2 19:49:35 CET 2015

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Sorry,
In case I will remeber. The reply to all button is not in view on gmail.

Thanks

2015-02-02 19:21 GMT+01:00 Digimer <lists at alteeve.ca>:

> Hi Patrick,
>
>   Please keep replies on the list, it helps keep the conversation in the
> archives which can help people in the future. :)
>
>   If you get a "reboot without logging", please tell us exactly what
> triggered it and what your configuration is. Either it's a misconfiguration
> or a bug, either of which are good to discover and understand properly.
>
>   To answer your questions;
>
>   I use the switches to help with debugging. With back-to-back, if a link
> drops, both go down. It makes it harder to diagnose where the problem is.
> Also, with managed switches, you can get tools to test and diagnose links
> as well.
>
>   Gluster is really a cloud solution, not really an HA solution, so I
> don't think it's relevant here (though others may disagree with me).
>
>   Note as well that I only use active/passive (mode=1) bonds because, in
> my testing, that is the only method that can reliably survive both failure
> and recovery and has the fastest fault detection and recovery possible.
>
> Cheers
>
> digimer
>
> On 02/02/15 01:13 PM, Patrick Prilisauer wrote:
>
>> Thanks!!,
>>
>> I'll give my Centos 7 setup one more chance, If that dumb thing, reboots
>> again with no logged event I'll performe your tutorial.
>>
>> Why do you use a switch in a two node setup? I've used in my last setup
>> Fibre channel single mode with an peer to peer connection, in fact I'm
>> not using a system like Gluster,... Im only interessted in a robust
>> storage backbone and the second connection for the Servers.
>>
>> is there another reason, than using the switch for sniffing?
>>
>> Anyway thanks a lot,..
>>
>>
>>
>> 2015-02-02 18:28 GMT+01:00 Digimer <lists at alteeve.ca
>> <mailto:lists at alteeve.ca>>:
>>
>>     I show how to use DRBD + clvmd + gfs2 in this tutorial:
>>
>>     https://alteeve.ca/w/AN!__Cluster_Tutorial_2
>>     <https://alteeve.ca/w/AN!Cluster_Tutorial_2>
>>
>>     I have clusters built following that tutorial all over north america
>>     (and I know of users around the world). Since 2010, not a single
>>     system was lost. The trick is that a lot of people don't understand
>>     the critical role of fencing, disable it or install it broken, then
>>     things break and they think it's the software. It's like blaming a
>>     car for being unsafe when you don't wear your seatbelt. :)
>>
>>     digimer
>>
>
>
> --
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
>
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