Linux performance tuning -vm.swappiness
Linux kernel has improved memory subsystem, with which administrators now have a simple interface to fine-tune the swapping behavior of the kernel. The linux kernel tunable parameter vm.swappiness (/proc/sys/vm/swappiness) can be used to define how aggressively memory pages are swapped to disk.
Linux moves memory pages that have not been accessed for some time to the swap space even if there is enough free memory available. By changing the percentage in /proc/sys/vm/swappiness you can control the swapping behavior, depending on the system configuration.
A high swappiness value means that the kernel will be more apt to unmap mapped pages. A low swappiness value means the opposite, the kernel will be less apt to unmap mapped pages. In other words, the higher the vm.swappiness value, the more the system will swap.
Support for partitions larger than 2.2 TB with BIOS
Installations can now be configured to boot from hard drive partitions larger than 2.2 TB using select BIOS models that support the newer GUID Partition Table (GPT). Legacy BIOS implementations previously limited ability to use large partitions on systems that were not using the newer Unified Extensible Firmware Interface (UEFI).
The initial ramdisk file on 64-bit PowerPC and 64-bit IBM POWER Series systems is now named initrd.img. In previous releases, it was named ramdisk.image.gz.
Red Hat Enterprise Linux 5.4 Virtualization Updates
Red Hat Enterprise Linux 5.4 now includes full support for the Kernel-based Virtual Machine (KVM) hypervisor on x86_64 based architectures. KVM is integrated into the Linux kernel, providing a virtualization platform that takes advantage of the stability, features, and hardware support inherent in Red Hat Enterprise Linux.
Virtualization using the KVM hypervisor is supported on wide variety of guest operating systems, including:
Red Hat Enterprise Linux 3
Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Windows XP
Windows Server 2003
Windows Server 2008
Important Notes on Upgrading the Panel on PVC for Linux
When you upgrade Plesk 8.x or 9.x to the latest version of Parallels Plesk Panel 10 in the Parallels Containers for Linux.
Make sure you upgrade all installed components when upgrading to a newer version of Parallels Plesk Panel. This is required to avoid conflicts caused by outdated components.
Note: Do not remove templates of previous Plesk versions from the VPS prior to upgrade.
Important: Parallels Plesk Sitebuilder 4.5 is not upgraded. Alternatively, the new version of SiteBuilder installs beside the previous one. Hence, you have the opportunity to manage existing sites in Sitebuilder 4.5 and create new sites either in Sitebuilder 5.0 or in 4.5. The upgrade of existing sites to the new format is performed manually.
Reference: http://parallels.net/
How to clone a Container in Parallels Containers for Linux
Issue a command in the following format:
{CT List} = [source_CTID]:[dst_CTID][:[[dstCT_private]][:[dstCT_root]]] [...]
You should specify the source Container ID ([source_CTID]) and the destination Container ID ([dst_CTID]).
Specifying the destination Container private area path ([dstCT_private]) and root path ([dstCT_root]) is optional allowing you to override the default paths - /vz/private/[dst_CTID] and /vz/root/[dst_CTID], respectively.
For example, to clone the Container with the Panel created during the previous procedure, run the following command:
