Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Digimer
On 01/26/2012 11:27 AM, Alan Brown wrote: > On 26/01/12 16:05, Digimer wrote: > >>> Is anyone actually using DRDB for serious cluster implementations (ie, >>> production systems) or is it just being used for hobby/test rigs? >> >> I use it rather extensively in production. I use it to back cluster

Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Alan Brown
On 26/01/12 16:05, Digimer wrote: Is anyone actually using DRDB for serious cluster implementations (ie, production systems) or is it just being used for hobby/test rigs? I use it rather extensively in production. I use it to back clustered LVM-backed virtual machines and GFS2 partitions. I st

Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Digimer
On 01/26/2012 10:46 AM, Alan Brown wrote: > On 26/01/12 14:41, Digimer wrote: > >> As for qdisk, you can't use it on DRBD, only on a SAN (as it is possible >> to have a split-brain condition where both nodes go StandAlone and >> Primary, this allowing both nodes to think they have the qdisk vote).

Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Alan Brown
On 26/01/12 14:41, Digimer wrote: As for qdisk, you can't use it on DRBD, only on a SAN (as it is possible to have a split-brain condition where both nodes go StandAlone and Primary, this allowing both nodes to think they have the qdisk vote). Is anyone actually using DRDB for serious cluster

Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Digimer
On 01/26/2012 09:02 AM, Corey Kovacs wrote: > My first thought is that since a two node cluster is at best a misnomer, > then clvmd won't work as expected since it might require the operational > semantics of a proper quorum based cluster (three nodes/votes or > better). That's how I understand it

Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Corey Kovacs
My first thought is that since a two node cluster is at best a misnomer, then clvmd won't work as expected since it might require the operational semantics of a proper quorum based cluster (three nodes/votes or better). That's how I understand it anyway so if anyone has info the contrary, please ch

Re: [Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Digimer
On 01/26/2012 08:45 AM, Devrim GÜNDÜZ wrote: > > Hi, > > This is RHEL 6.2, where all packages are up2date. > > For a simple 2-node cluster, clvmd cannot start, because it cannot scan > clustered LVs -- if one of the nodes are down. It simply hangs in the > vgscan phase. > > Is that the expected

[Linux-cluster] Preventing clvmd timeouts

2012-01-26 Thread Devrim GÜNDÜZ
Hi, This is RHEL 6.2, where all packages are up2date. For a simple 2-node cluster, clvmd cannot start, because it cannot scan clustered LVs -- if one of the nodes are down. It simply hangs in the vgscan phase. Is that the expected behaviour? If not, what is the recommended way to get rid of thi