Yes, working for me on centos 5.6 samba/glusterfs/ext3. Seems to me ucarp is not configured to work master/slave: Master: ID=1 BIND_INTERFACE=eth1 #Real IP SOURCE_ADDRESS=xxx.xxx.xxx.xxx #slaveconfig,OPTIONS="--shutdown --preempt -b 1 -k 50" OPTIONS="--shutdown --preempt -b 1" #Virtual IP used by ucarp VIP_ADDRESS="zzz.zzz.zzz.zzz" #Ucarp Password PASSWORD=yyyyyyyy On you slave you need: OPTIONS="--shutdown --preempt -b 1 -k 50" Good luck Daniel EDV Daniel M?ller Leitung EDV Tropenklinik Paul-Lechler-Krankenhaus Paul-Lechler-Str. 24 72076 T?bingen Tel.: 07071/206-463, Fax: 07071/206-499 eMail: mueller at tropenklinik.de Internet: www.tropenklinik.de Von: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] Im Auftrag von anthony garnier Gesendet: Donnerstag, 8. September 2011 15:03 An: gluster-users at gluster.org Betreff: UCARP with NFS Hi all, I'm currently trying to deploy ucarp with GlusterFS, especially with nfs access. Ucarp works well when I ping the VIP and i shutdown Master (and then when the Master came back up),but I face of a problem with NFS connections. I got a client mounted on the VIP, when the Master fall, the client switch automaticaly on the Slave with almost no delay, it works like a charm. But when the Master come back up, the mount point on the client freeze. I've done a monitoring with tcpdump, when the master came up, the client send paquets on the master but the master seems to not establish the TCP connection. My? volume config : Volume Name: hermes Type: Replicate Status: Started Number of Bricks: 2 Transport-type: tcp Bricks: Brick1: ylal2950:/users/export Brick2: ylal2960:/users/export Options Reconfigured: performance.cache-size: 1GB performance.cache-refresh-timeout: 60 network.ping-timeout: 25 nfs.port: 2049 As Craig wrote previously, I well probed hosts and created the volume with their real IP, I only used the VIP with the client. Does anyone got experience with UCARP and GlusterFS ? Anthony