We're using it on multipath, it's a failure to write to the device that's killing the cluster. All other devices work, so the cluster can function as it should, would it be for the reboot by the cluster software. I would like to prevent the cluster rebooting nodes just because the qdisk isn't responding (due to slow storage, failure on the quorum location such as powerloss and other, non application related, errors) When both nodes are up and the application is able to run, there should be no reboot in my opinion. With regards, Inter Access BV ing. J.C.M. (Jan) Huijsmans Designer / Technical Consultant UNIX & Linux Infrastructure Professional Services UNIX E-mail: jan.huijsmans@xxxxxxxxxxxxxx Tel: 035 688 8266 Mob.: 06 4938 8145 Hoofdkantoor: Colosseum 9, 1213 NN Hilversum Postbus 840, 1200 AV Hilversum K.v.K. Hilversum 32032877 ________________________________________ From: linux-cluster-bounces@xxxxxxxxxx [linux-cluster-bounces@xxxxxxxxxx] On Behalf Of emmanuel segura [emi2fast@xxxxxxxxx] Sent: 10 February 2012 15:16 To: linux clustering Subject: Re: Cluster stability with missing qdisk Why you don't use qdisk on multipath, than can resolv your problem 2012/2/10 Jan Huijsmans <Jan.Huijsmans@xxxxxxxxxxxxxx<mailto:Jan.Huijsmans@xxxxxxxxxxxxxx>> Hello, In the clusters we have we use a qdisk to determine which node had the quorum, in case of a split brain situation. This is working great... until the qdisk itself is hit due to problems with the SAN. Is there a way to have a stable cluster, with qdisks, where the absence of (1) qdisk won't kill the cluster all together. At this moment, with the setup with 1 qdisk, the cluster is totally depending on the availability of the qdisk, while, IMHO, it should be expendable. We have now a triangle setup, with 2 data centers and 1 extra 'quorum' location for the IBM SAN. In the SAN setup there are 3 quorum devices, 1 in each data center and the 3rd on the quorum location. When 1 location fails (one of the data centers or the quorum location) it is still up and running. Is it possible to copy this setup and use 3 qdisks, so when 1 qdisk fails the cluster stays alive? I would set the vote value of all components (systems and qdisks) to 1, so the cluster would keep running with 2 systems and 1 qdisk or 1 system with 2 qdisks. (it'll be dead with only 3 qdisks, as the software will die with both systems ;) ) I've heard of setup's with 3 systems, where the 3rd was just for the quorum, so you this one can die, but on this occasion it won't help us, as there are no systems on the 3rd location. (and it's not supported by Red Hat, when I'm correctly informed) With regards, Inter Access BV ing. J.C.M. (Jan) Huijsmans Designer / Technical Consultant UNIX & Linux Infrastructure Professional Services UNIX E-mail: jan.huijsmans@xxxxxxxxxxxxxx<mailto:jan.huijsmans@xxxxxxxxxxxxxx> Tel: 035 688 8266<tel:035%20688%208266> Mob.: 06 4938 8145<tel:06%204938%208145> Hoofdkantoor: Colosseum 9, 1213 NN Hilversum Postbus 840, 1200 AV Hilversum K.v.K. Hilversum 32032877 -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx<mailto:Linux-cluster@xxxxxxxxxx> https://www.redhat.com/mailman/listinfo/linux-cluster -- esta es mi vida e me la vivo hasta que dios quiera -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
