On Mon, 2007-12-03 at 14:39 -0500, Shawn Hood wrote: > Hey folks, > > I'm in the process of implementing a GFS cluster. A quick over of our hardware: > > 1 Apple xraid (with plans to bring the two others into the SAN after testing)SA > 3 Dell (2x 1950 / 1x 2950) boxes, running RHEL4u5 > Qlogic SANbox > Qlogic HBAs > > lvscan of SAN volume group > > ACTIVE '/dev/hq-san/nlp_qa' [700.00 GB] inherit > ACTIVE '/dev/hq-san/prod_reports' [1000.00 GB] inherit > ACTIVE '/dev/hq-san/cam_development' [500.00 GB] inherit > ACTIVE '/dev/hq-san/nlp_development' [500.00 GB] inherit > ACTIVE '/dev/hq-san/svn_users' [1.50 TB] inherit > > > We run a mixed environment of RHEL4.5 and RHEL5.1. We're currently in > the process of developing a plan to shorten the OS lifecycle so we can > have all of our cluster nodes in a more homogenous RHEL5.1 > environement. Anyhow, we plan to scale to about 3-5x our current > storage capacity and 3-4x our current server count within the next > several months. > > That said, I need to decide know the parameters to use when creating > journals--number of journals and size. I could not find any > information about how the number of journals affects performance. > What kind of performance impact would I see by creating 9-12 journals > that we will eventually need? If the size of the filesystem is > smaller than the logical volume, can the number of journals be > increased? What about journal size impacting performance? > > If information on this already exists, could someone point me to it? > > Shawn > > -- > Linux-cluster mailing list > Linux-cluster@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/linux-cluster Shawn, I am assuming you do not have a GFS cluster up yet. If you plan on moving quickly to RHEL5.1, I suggest you do you initial as that version because the cluster infrastructure is not compatible between 4.5 and 5.1. I do not believe that having both 4.5 and 5.1 in a unified cluster is a supported configuration. I do not think unused journals affect performance - they just reserve space. man gfs_jadd to see how to add more journals later. -- Regards, -C Christopher Barry Systems Engineer, Principal QLogic Corporation 780 Fifth Avenue, Suite 140 King of Prussia, PA 19406 o/f: 610-233-4870 / 4777 m: 267-242-9306 -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
