From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wendy Cheng Date: Thu, 29 Jun 2006 13:47:50 -0400 Subject: [Cluster-devel] [RFC PATCH 0/3] NLM lock failover Message-ID: <44A41246.2070106@redhat.com> List-Id: To: cluster-devel.redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit The uploaded patches implement NLM lock failover as discussed in: http://www.redhat.com/archives/linux-cluster/2006-June/msg00050.html [PATCH 1/3] Add a new admin interface into current nfsd procfs filesystem to trigger NLM lock releasing logic. The command is invoked by echoing the server virtual IP address into /proc/fs/nfsd/nlm_unlock file as: shell> cd /prod/fs/nfsd shell> echo 10.10.1.1 > nlm_unlock It is currently restricted to IPV4 addressing and the command should be invoked from the taken-over NFS server. To do list (not yet implemented) include: 1. IPv6 addessing enablement 2. Add "client:server" ip pair to allow NFS V4 lock failover as proposed by Andy Adamson (CITI). [PATCH 2/3] Add take-over server counter-part command into nfsd procfs interface to allow selectively setting of per (virtual) ip (lockd) grace period. It is also invoked by echoing the virtual IP into /proc/fs/nfsd/nlm_set_ip_grace file as: shell> cd /proc/fs/nfsd shell> echo 10.10.1.1 > nlm_set_ip_grace It is also restricted to IPV4 addressing and the command is expected to be invoked from the take-over NFS server. [PATCH 3/3] This kernel patch has *not* been unit tested out yet and it needs to be paired with user mode nfs-utils changes (not ready in time for this RFC). It puts the taken-over IPv4 address in standard dot notation into the 3rd parameter of ha_callout program (see man rpc.statd for details) for "add-client" event. For "del-client", we would assume the monitored host should be removed from machine-wide lists, regardless server's interface. Upon agree-ed on, we will integrate the changes into our cluster suite to start a full function verification test. Please comment. -- Wendy