Il 21/03/2013 18:14, Digimer ha scritto: > On 03/21/2013 01:11 PM, Maurizio Giungato wrote: >> Hi guys, >> >> my goal is to create a reliable virtualization environment using CentOS >> 6.4 and KVM, I've three nodes and a clustered GFS2. >> >> The enviroment is up and working, but I'm worry for the reliability, if >> I turn the network interface down on one node to simulate a crash (for >> example on the node "node6.blade"): >> >> 1) GFS2 hangs (processes go in D state) until node6.blade get fenced >> 2) not only node6.blade get fenced, but also node5.blade! >> >> Help me to save my last neurons! >> >> Thanks >> Maurizio > > DLM, the distributed lock manager provided by the cluster, is designed > to block when a known goes into an unknown state. It does not unblock > until that node is confirmed to be fenced. This is by design. GFS2, > rgmanager and clustered LVM all use DLM, so they will all block as well. > > As for why two nodes get fenced, you will need to share more about > your configuration. > My configuration is very simple I attached cluster.conf and hosts files. This is the row I added in /etc/fstab: /dev/mapper/KVM_IMAGES-VL_KVM_IMAGES /var/lib/libvirt/images gfs2 defaults,noatime,nodiratime 0 0 I set also fallback_to_local_locking = 0 in lvm.conf (but nothing change) PS: I had two virtualization enviroments working like a charm on OCFS2, but since Centos 6.x I'm not able to install it, there is same way to achieve the same results with GFS2 (with GFS2 sometime I've a crash after only a "service network restart" [I've many interfaces then this operation takes more than 10 seconds], with OCFS2 I've never had this problem. Thanks -------------- next part -------------- A non-text attachment was scrubbed... Name: cluster.conf Type: text/xml Size: 879 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20130321/5e46b901/attachment-0006.xml> -------------- next part -------------- 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 20.11.11.104 lama4.blade 20.11.11.105 lama5.blade 20.11.11.106 lama6.blade 20.11.12.104 lama4-fencing lama4-fencing.blade 20.11.12.105 lama5-fencing lama5-fencing.blade 20.11.12.106 lama6-fencing lama6-fencing.blade