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>SAN always can be considered as a last resort but dual-primary drbd is a goal because we only need two hosts and no >very expensive SANs.
The beauty of this is that you do not need expensive SANs. It is not that hard to build a HA SAN using standard hardware and CentOS and the following packages: drbd, pacemaker and tgt (iSCSI target software).
I usually use refurbished HP servers for this.
Take a look at http://www.linbit.com/en/downloads/tech-guides
And read the "Highly available iSCSI with DRBD and Pacemaker" guide
I have made a step by step instruction manual myself for this kind of SANs.
Van: Stanislav German-Evtushenko [mailto:firstname.lastname@example.org]
Verzonden: maandag 25 maart 2013 12:52
Aan: Maurits van de Lande
Onderwerp: Re: [DRBD-user] Uncatchable DRBD out-of-sync issue
> filter = [ "a|drbd|", "r|.*|" ]
yes, something like this is in place
> write_cache_state = 0
I have write_cache_state = 1 (default) but this is only filtering cache as I understand and /etc/lvm/cache is empty on both nodes
> Do you use some custom disk caching module like flashcache?
I'm not sure what is flashcache so I think don't use it.
> To avoid the dual primary mode I have put all storage on an a HA iSCSI SAN, then drbd can be used in primary/secondary mode. If you want I can send you my setup notes using centos 6.4 drbd, tgt and pacemaker.
SAN always can be considered as a last resort but dual-primary drbd is a goal because we only need two hosts and no very expensive SANs.
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