----- Original Message ----- | Hi there, | | | | right now we have a centos 6.4 (2.6.32-279) and a Gentoo (3.1.6) gfs2 | cluster running. | | The centos cluster shows some weird behavior with PHP processes “dying” with | process state D (uninterruptable IO). The Gentoo cluster never had any of | those problems. | | | | So I wanted to figure out what gfs2 versions both are running, but I cant | find any significant information on that (changelogs based on kernel | versions etc.) | | Is there any improvement in gfs2 going on in kernels like 2.6.32? or would | it be much better to upgrade to a recent version (3.12 e.g.) to get all the | performance features and bugfixes? | | Or is gfs2 split up in separate packages (gfs2-util etc.) and you can run | current versions of gfs2 also on 2.6.32 kernels? | | | | Thanks in advance for your help. This really confuses me. | | | | Juergen Hi Juergen, Yes, there is ongoing performance work being done in GFS2 in versions ranging from 2.6.32-X to upstream. (I'm doing much of this work). This work is being done mostly in the name of RHEL6.X, but will probably trickle down to Centos in due course. I don't know about Gentoo or where it gets its stuff; sorry. The more recent the version, the better and faster GFS2 should be. So the RHEL6.4 version has a lot of performance patches over RHEL6.3, and the RHEL6.5 version will have a lot of performance patches from RHEL6.4. We (Red Hat) have a performance group that runs benchmarks against the different releases and periodically reports the results to us. Also, we work with our business partners to make sure various third-party apps are running better/faster as well. Very few (if any) of the performance improvements are being back-ported to RHEL5 and/or the 2.6.18 kernels. These are all being pushed upstream as well, which means they'll make their way into Fedora, RHEL7, etc. I don't recommend trying to run an upstream kernel (or RHEL7 kernel) on a RHEL6 or Centos6 box; I doubt it would do the right thing, in general. The same can generally be said about gfs2-utils as well. IOW, the newer the package, the better performance will be, etc. Regards, Bob Peterson Red Hat File Systems -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
