Persistent raw devices for Oracle RAC with iSCSI
Using udev to set persistent raw devices for iscsi in Oracle RAC
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Protect Vmware guest under RedHat Cluster
Most documentation on the net is about how to run a cluster-in-a-box under Vmware. Very few seem to care about protecting Vmware guests under real RedHat cluster with a shared storage. This article is just about it. While I would not recommend using Vmware in such a setup, it has been the case, and that…
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Xen Networking – Bonding with VLAN Tagging
The simple scripts in /etc/xen/scripts which manage networking are fine for most usages, however, when your server is using bonding together with VLAN tagging (802.11q) you should consider an alternative. A PDF document written by Mark Nielsen, GPS Senior Consultant, Red Hat, Inc (I lost the original link, sorry) named “BOND/VLAN/Xen Network Configuration” as a…
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MySQL permissions for LVM Snapshots
aking LVM snapshots as a mean of backing up MySQL is rather simple, as can be described here. However, if you are into security, you would strive to grant minimal permissions for the action to the MySQL user. Per MySQL Documentation, the required privileges is “RELOAD”. That should be enough, granted on *.*, of course.
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Raw devices for Oracle on RedHat (RHEL) 5
There is a major confusion among DBAs regarding how to setup raw devices for Oracle RAC or Oracle Clusterware. This confusion is caused by the turn RedHat took in how to define raw devices. Raw devices are actually a manifestation of character devices pointing to block devices. Character devices are non-buffered, so they act as…
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Xen VMs performance collection
Unlike VMware Server, Xen’s HyperVisor does not allow an easy collection of performance information. The management machine, called “Domain-0” is actually a privileged virtual machine, and thus – get its own small share of CPUs and RAM. Collecting performance information on it will lead to, well, collecting performance information for a single VM, and not…