Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
>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. Regards, Maurits -----Oorspronkelijk bericht----- Van: Stanislav German-Evtushenko [mailto:ginermail at gmail.com] Verzonden: maandag 25 maart 2013 12:52 Aan: Maurits van de Lande CC: drbd-user at lists.linbit.com 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. Best regards, Stanislav