The ramblings of a computer geek
RAID (Redundant Array of Inexpensive Disks) is a way of organising and using disks (Hard Disks) to increase performance or provide fault tolerance. RAID can also be set up to provide both functions at the same time. RAID is a set of two or more ordinary hard disks and a specialized disk controller that contains … Read more
When trying to install Puremessage, you need to upgrade the instance of MSDE you are using to a specific verson MSDE 2000 SP4. More details at this page on the Sophos support site. http://www.sophos.com/support/knowledgebase/article/46290.html If when trying to upgrade MSDE you get an error saying you need to change the SA password, you are not … Read more
To ensure I have a good off-site synch of my data i now use DeltaCopy http://www.aboutmyip.com/AboutMyXApp/DeltaCopy.jsp its basically a version of rsync for windows. Its quite simple to setup and works well. The package includes the client and the server. In my case i have two servers, one local, one remote, the two sync with … Read more
I had the problem that the APC UPS Management Card Utility software used to configure the IP was not working. It detected the unconfigured card okay, and prompted for the settings but never took them. In the end I found a document from APC support that showed a workaround to get it configured. Note: you … Read more
This is the procedure to match a (VMWare Datastore and) VMWare LUN ID to the underlying storage ID on an EMC SAN. (The procedure would work for another type of SAN as long as you can get the UUID off the SAN for each LUN. With help from # KB Article: 1005587 # Updated: Aug … Read more
This is a way to move the VMDKs for a VM from local storage to the SAN. First you need to get your SAN hooked in, once you do this, SSH onto the box, under your vmfs directory you’ll find the directories (links) to the LUNs presented from your SAN. To move from /vmfs/volumes/storage1 to … Read more
We are running on Microsoft Windows 2008 Server Standard R2, after installing VMWare Tools, the mouse performance is still annoyingly jerky. In Windows 2003 or XP just installing the VMWare Tools and setting the Troubleshooting “Hardware Acceleration” to “Full” fixes the problem. However in Windows 2008 Server R2 the driver picked up doesn’t seem to … Read more
If you need to use jumbo frames on your ISCSI you need to run this command from the command line of the ESX host: e.g. You’ll need to reboot to let the changes take effect. To verify run the below, which lists the current settings. http://www.vi-tips.com/2009/04/configuration-of-iscsi-in-vmware-vi3.html
I recently completed a migration of an 8 year old Oracle server to a nice new VM running on VMware Vpshere 4.1, this went without too many problems. However when people started to use it, the performance suffered and the server ground to a halt. The software vendor whose database it was imediately said, “ah … Read more
I recently had to resolve some TNS listener errors on a Oracle database server. It was Oracle 11g running on Microsoft Windows 2003 Server R2 SP2 32bit. Basically the problem was that the memory Oracle was using was hitting the 2gb ram limit in the 32bit user space. Adding the /3GB switch to the end … Read more