Hi Phil, Yes, I recently learned that having multiple pNFS MDS servers are not possible.
Has there been some work [either some benchmarks/new design] in this direction? Thanks Nirmal Phil Carns wrote: > Hi Nirmal, > > Are you trying to have multiple pNFS MDS servers, or multiple meta > servers in the PVFS volume? > > I don't believe that the former is supported (but I was hoping someone > else would chime in- I have not used the pNFS/PVFS implementation > first hand). > > The latter should work fine without any particular changes to the > installation steps except for the PVFS configuration files. > > In either case I am pretty sure that the bind option to mount is not > going to do what you are looking for. > > -Phil > > > Nirmal Thacker wrote: >> 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 > _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
