On Mon, Jul 19, 2010 at 11:13 PM, Wahyu Darmawan <wahyu.darmawan at gmail.com> wrote: > Hi all, > > > > I have problem with my servers. I use two of HP Blade Servers and RHEL 4.6 > installed on them, and have IBM DS4700 connected to them. > > In those servers are running RHCS (Red Hat Cluster Suite) with GFS for > handling Oracle Database. > > Yesterday, I had missing one partition from the storage, suddenly. I called > IBM and they suggested to use RDAC. They suggest this because it's what they're familiar with and what they support. > The question is, Why should use IBM RDAC for multipath on RHEL 4, and why HP > Blade + HP EVA Storage don't use any addition plugins software to keep > server + storage connection? I'm not sure if the dm-multipath in centos4 is recent enough, but in centos5 you don't need to use the rdac stuff at all. You can simply configure the ds4700 using the rhel device-mapper-multipath package and a couple modifications in the file for wwid and other bits. You might check into see if this is the case for centos4 as well. We have a DS4700 as well though with IBM blades, and the mpp (rdac) drivers are a royal PITA when it comes to updating the kernel. I would look to see if this blog post helps you -> http://www.bofh-hunter.com/2009/09/02/dm-multipath-and-the-ds4700/ -- During times of universal deceit, telling the truth becomes a revolutionary act. George Orwell