Archive for December, 2009

Using the Linux parted utility to re-create a lost partition table

I ran into an issue last week where two nodes using shared storage lost the partition table on one of the storage devices they were accessing. This was extremely evident in the output from fdisk: $ fdisk -l /dev/sdb Disk /dev/sdb: 107.3 GB, 107374182400 bytes 255 heads, 63 sectors/track, 13054 cylinders Units = cylinders of […]

Creating Linux bridging / tap devices with tunctl and openvpn

The more and more I play around with KVM virtualization, the more I realize just how useful Linux bridging is. In the Linux bridging world, a bridge device simulates a multiport Ethernet switch. To connect to the switch, you create a tap device that simulates a port on that switch. Once you have bridging configured […]

Backing up your COMSTAR storage configuration

I have been playing around with the COMSTAR iSCSI and FC port providers for the past few months, and other than a number of problems with the emlxs driver, they appear to work pretty well. As I’ve been experimenting, I wanted to back up my configuration in case something happened to my server. COMSTAR uses […]

Expanding VMWare guest storage and extending LVM volumes and ext3 file systems to use the new storage

One of my production vSphere virtual machines came close to running out of space this past week. Expanding guest storage with vSphere is a breeze, and I wanted to jot down my notes in this blog post. To expand the size of a virtual disk, you will need to open the virtual infrastructure client, right […]

Keeping up to date with CentOS happenings

I just found out the folks in the CentOS community have a planet feed! If you are interested in keeping up to date with all things CentOS, you should add their feed to your RSS reader.

Configuring an OpenSolaris host to use a static IP address

I installed OpenSolaris 2009.06 yesterday, and noticed that the installer doesn’t give you the option to configure a static IP address. Network address are retrieved via DHCP, which isn’t an option for this host. To configure the host to use a static IP address, I changed the /etc/nwam/llp file. Here is the file before: $ […]

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