Hello, I have a question regarding CITI's implementation of pNFS/PVFS2
Alternatively you could point me to a mailing lists for users of pNFS/PVFS2 by the CITI group. I cannot seem to find a forum/group who discuss issues of pNFS/PVFS2 [if it is not this one] My problem is as follows: I want to use more than a single Metadata server [MDS] in CITI's pNFS/PVFS2. I use the instructions described here: http://www.citi.umich.edu/projects/asci/pnfs/docs/pnfspvfs2.html I understand these are not of the current build, but I am using an older build of pNFS/PVFS2. Now if there are two or more MDS nodes, then how will clients mount the MDS nodes on a single mount point? I am familiar with the mount --bind argument [http://www.redhatmagazine.com/2007/03/19/how-do-i-mount-an-nfsv4-filesystem-in-two-locations-on-a-single-client/]. Is this what we must do? This situation arises on two occasions 1. When the MDS mounts a PVFS2 filesystem. Multiple MDS then mount the MDS PVFS2 filesystems at one point. To quote from the instructions : // Load kernel interface // Run on MDS insmod /usr/local/bin/pvfs2-server/pvfs2.ko /usr/local/bin/pvfs2-server/sbin/pvfs2-client -p /usr/lo:cal/bin/pvfs2-server/sbin/pvfs2-client-core mount -t pvfs2 tcp://"mds_server_hostname":3334/pvfs2-fs /mnt/pvfs2 2. When the clients mount an NFS4 filesystem [essentially a PVFS2 filesystem exported by the MDS] To quote: Step 7: Mount PVFS2 file system using pNFS * Copy /etc/pvfs2tab file to every client * Example: // On client insmod /usr/local/bin/pvfs2-layout/pvfs2-pnfs.ko /usr/local/bin/pvfs2-layout/sbin/pvfs2-client -p /usr/local/bin/pvfs2-layout/sbin/pvfs2-client-core mount -t nfs4 "mds_server_name":/ /mnt/nfs4/ In both cases, multiple MDS cause the mounts to overlap. Although I have not tried this out, I suspect this is would result in an incorrect configuration. Have you come across this issue when you worked with pNFS/PVFS2 before? Thanks for your time. Nirmal Thacker _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
