On 10/25/2011 10:01 PM, Harry Mangalam wrote:
- what happens in a distributed system if a node goes down? Does the rest of the system keep working with the files on that brick unavailable until it comes back or is the filesystem corrupted? In my testing, it seemed that the system indeed kept working and added files to the remaining systems, but that files that were hashed to the failed volume were unavailable (of course).
This is basically it.
- is there a head node? the system is distributed but you're mounting a
Only if you mount via nfs, though technically you can mount it from any server. If you mount via gluster client, just point it at any of the servers. In the nfs case, if the mount server goes away, so does access unless you remount. In the glusterfs case, if the mount server goes away, the other servers can continue talking with the client.
specific node for the glusterfs mount - if that node goes down, is the whole filesystem hosed or is that node reference really a group reference and the gluster filesystem continues with the loss of that node's files? ie can any gluster node replace a mountpoint node and does that happen transparently? (I haven't tested this).
You can mount from any node, but the mount target has to be specifically unmounted/remounted under nfs (umount -l is your friend). With GlusterFS client its less of an issue.
This said, I don't know many people using the nfs client version. I haven't tested 3.2.4's server, but through 3.2.3, we can crash the NFS server with a moderate load.
- can you intermix distributed and mirrored volumes? This is of
Not sure what you mean by intermix ... but yes, you can have multiple (many) volumes of all different types coming from the same units on different volume names.
particular interest since some of our users want to have replicated data and some don't care. Many thanks hjm -- Harry Mangalam - Research Computing, OIT, Rm 225 MSTB, UC Irvine [ZOT 2225] / 92697 Google Voice Multiplexer: (949) 478-4487 MSTB Lat/Long: (33.642025,-117.844414) (paste into Google Maps) -- This signature has been OCCUPIED! _______________________________________________ Gluster-users mailing list [email protected] http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
-- Joseph Landman, Ph.D Founder and CEO Scalable Informatics, Inc. email: [email protected] web : http://scalableinformatics.com http://scalableinformatics.com/sicluster phone: +1 734 786 8423 x121 fax : +1 866 888 3112 cell : +1 734 612 4615 _______________________________________________ Gluster-users mailing list [email protected] http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
