Performance

As part of a project, old server hardware was replaced with shiny new hardware. Beside the server hardware, storage hardware and infrastructure was also replaced. The new hardware was installed beside the old hardware and because the customer has a high virtualization ratio, nearly all servers were VMs and the migration of the VMs was was done without downtime. The customer uses a Windows 2008 R2 failover cluster for file services and MS SQL Server. The MS SQL Server is the database for the ERP software. This cluster used in-guest iSCSI and because of this, we were able to move it online to the new server hardware and migrate the cluster disks later. At a certain point we had the cluster nodes on the new hardware and were able to do a direct comparison in terms of the performance of the new hardware. The runtime of batch jobs and the experience of user showed us, that the hardware was slower. We were puzzled…