This post is intended to be a dummy guide, best practices, or whatever you call it… about setting up a network while working with virtual boxes on a desk- or laptop. I was setting up a virtual box environment with several Virtual Boxes on my laptop, and as I’m not a network – specialist, I
This post has already been published in the past on the AMIS-blog. To build an Oracle 12C RAC database – on Virtual Boxes – there’s at least shared storage needed for ASM, and a DNS-server for the SCAN-addresses. Several methods can be used for this, but for the storage in my private project I
Oracle will not provide ASMLib packages for kernels distributed by Red Hat as part of RHEL 6.
The second and final post about an issue with a RAC-configuration with two SAN's. Problem was a i/o-freeze of minutes when crashing one of the two SAN's. The first post I ended with a 'cliffhanger' because we had a solution, but not tested it yet.
With this setup we are facing the issue that if we loose a complete SAN, the IO’s to the ASM diskgroups will be blocked for approx 3 till 4 minutes. Oracle does not like this. After 70 seconds after a freeze, rdbms is starting to reboot (expected behaviour).
The metric 'swap utilisation (%)' on the node where Grid Control resides, shows permanently a very hig value. Red Hat Linux, 64-bits, 32GB RAM, 4GB swap. Adding 4GB to the swap-file solved the problem.
This is the second post of my little project of building my own RAC on my Windows7-desktop (64-bits, 8GB RAM), using 3 VM’s (VM-workstation , 7.1.3 build-324285) : * 2 VM’s for two RAC-nodes, based on OEL 5.5, 126.96.36.199 for infra, and database. * 1 VM as my own SAN, based on Openfiler 2.3 (free), for ASM.
While building my own RAC on two VM's, using a third VM with Openfiler on it as my SAN, I had to dowload, install, configure and load ASMLIB. Loading didn't seem to go smoothly at my own project. First I analyzed what I did, steps I took
I was building my own Oracle RAC 11g cluster (188.8.131.52) with Openfiler as my shared storage. Two VM's as my rac-cluster, one VM with Openfiler as my own SAN. Followed the instructions of the article of Jeffrey Hunter how to build a RAC on OEL and iSCSI, however this article is not based on VM. My Openfiler-VM was ready, given access to my both nodes on iSCSI-level, and now I want my rac1-node to discover the iSCSI-drives on my Openfiler.
For those who are not that interested in the whole story about RAC, GFS2, the misscount-parameter and Red Hat, I’ll give you the outcome: don’t use RAC (10 or 11) with GFS2 – Red Hat Cluster Suite, it’s a dead end road. For those who are interested, you’re invited…