Wendy Cheng <wcheng <at> redhat.com> writes: > > Revised patches based on 2.6.21-rc4 kernel and nfs-utils-1.1.0-rc1 that > address issues discussed in: > https://www.redhat.com/archives/cluster-devel/2006-September/msg00034.html > > Quick How-to: > 1) Failover server exports filesystem with "fsid" option as: > /etc/exports entry> /mnt/shared/exports *(fsid=1234,sync,rw) > 2) Failover server dispatch rpc.statd with "-H" option. > 3) Failover server drops locks based on fsid by: > shell> echo 1234 > /proc/fs/nfsd/nlm_unlock > 4) Takeover server enters per fsid grace period by: > shell> echo 1234 > /proc/fs/nfsd/nlm_set_igrace > 5) Takeover server notifies clients for lock reclaim by: > shell> /usr/sbin/sm-notify -f -v floating_ip_address -P an_sm_directory > > Patch Summary: > 4-1: implement /proc/fs/nfsd/nlm_unlock > 4-2: implement /proc/fs/nfsd/nlm_set_igrace > 4-3: correctly record and pass incoming server ip interface into rpc.statd. > 4-4: nfs-utils statd changes > 4-1 includes an existing lockd bug fix as discussed in: > http://sourceforge.net/mailarchive/forum.php? thread_name=4603506D.5040807%40redhat.com&forum_name=nfs > (subject: [NFS] Question about f_count in struct nlm_file) > 4-4 includes an existing nfs-utils statd bug fix as discussed in: > http://sourceforge.net/mailarchive/message.php? msg_name=46142B4F.1030507%40redhat.com > (subject: Re: [NFS] lockd and statd) > > Misc: > o No IPV6 support due to testing efforts > o NFS V3 only - will compare notes with CITI folks (NFS V4 issues) > o Still need some error-inject tests. > Hi everyone! I'm building an A/A cluster using NFS v3 and local file systems, and looking for efficient ways for failover (for now I have to restart nfs-kernel-server on Takeover node to be able to initiate grace period), so the discussed solutions are very interesting to me. Now (4 years after) in current nfs-utils packages (v. 1.2.2-4 and later) I can see that the ability to release locks was really implemented and is working well (I mean interfaces /proc/fs/nfsd/unlock_ip and /proc/fs/nfsd/unlock_filesystem), but how about reacquiring locks on the node, share migrates to? - I've been going through various mailing lists and found a lot of discussions on the topic (also dated mainly 2007), but don't seem to find any rpc-based mechanism or interface like /proc/fs/nfsd/nlm_set_grace to do that, was it ever made? Thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
