Hi, On Fri, 2011-04-15 at 11:00 -0400, Nicolas Ross wrote: > Hi ! > > We are slowly migrating services to our new cluster... We curently have an 8 > node cluster with a 16 1tb disk enclosure in 7 x raid1 pairs, with 2 global > spares. > > the first 2 arrays are in one vg, wich is in turn seperated in a 100 gig, a > 300 and a 1tb lvs, all in gfs2. > > I use the firts lv as a global utility partition where I put my developement > directories (source trees for apache, php, etc), and other binary utilities. > This partition is mounted all the time on all nodes (it's in /etc/fstab). > > Now, if I connect to the first node, do some make distclean, ./configure, > make and make > install in on of my source directory, httpd for instance. The make distclean > for exemple takes about 30 seconds or so. > > Now, I logout from the first node and I move to the next node where I need > to do such update, and go into the same directory and do the same thing. Now > it takes forever. I stoped after 3 or 4 minutes. There was no other node > useing that directory at that time. > > Here's my fstab entry : > > /dev/VGa/gfs /gfs gfs2 defaults,noatime,noquota 0 0 > > What can I do or what parameter can I tune to help improve this kind of > performance ? > Did you do a sync on the node that you were moving away from before starting work on the new node? That should help to speed up the change of node. I suspect that the issue is that the utilities are working over a large number of small files, and those will take some time to migrate to the new node, since it will be accessing each file sequentially. There have been a few performance improvements recently which may help, depending on exactly which kernel you are using at the moment, Steve. -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
