zhicheng wang wrote: > please does any one have experience on running redhat > AS4 on VMWare virtual machines? We are in the process > of upgrading servers and one option is vitalisation. RHEL4 runs on VMware virtual machines, with some gotchas. VMware can emulate either lsilogic or buslogic SCSI controller. RHEL4 supports only lsilogic, so you'll have to configure virtual machines with lsilogic (VMware provides device driver for buslogic controller, but there's no point installing it, since lsilogic works just fine). There are some clock issues with virtual machines that run 2.6 version of Linux kernel. These are mainly due to change of kernel's internal HZ constant from 100 (pre-2.6 kernels) to 1000 (2.6 kernel). You can either recompile 2.6 kernel with HZ set to 100, or you can use one of the available workarounds (using clock=pit kernel option when booting and VMware-tools for clock synchronization between host and guest OS -- note that you'll need both). Note that if you have too many virtual machines running 2.6 kernel with HZ set to 1000 on single host, you might experience high CPU usage of the host even when all those machines are idle. There was a discussion about this issues on Nahant (RHEL4) mailing list, you might want to check the thread Kernel timer for 2.6 kernel in the mailing list archives. -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
