LAMP (acronym for Linux, Apache, MySQL, PHP) software stack is widely used for building modern web siteson Linux. We measure not only performance (So it's quite natural that there is a need to understand how well such type of workloads run in virtualized environment and how many LAMPs virtualization can bare on a single piece of hardware. 2 important metrics are presented in this report: total number of serviced requests can deliver server), but also maximum /sec and average response time - to understand QoS.

To measure LAMP software stack performance and density we use DVD-Store E-Commerce benchmark developed by [http://linux.dell.com/dvdstore/ Dell]. This benchmark is also widely used by RedHat and others.

Hardware:* Server: 4xHexCore Intel Xeon (2.66 GHz), 64 GB RAM, HP MSA1500 SAN Storage, 8 SATA (7200 RPM) Disks in RAID0 *Client: 4xHexCore Intel Xeon (2.136 GHz), 32 GB RAM * Network: Gbit 1Gbit direct server<->client connection Virtualization Software: ESXi4.1upd1, XenServer5.6fp1, HyperV (R2), OpenVZ (RH6) 2.6.32-042test006.1.x86_64

Platform:* Virtualization Software: ESXi4.1upd1, XenServer5.6fp1, HyperV (R2), OpenVZ (RH6) 2.6.32-042test006.1.x86_64* Guest OS: Centos 5.5 x86_64

* OpenVZ shows the best performance over solutions tested: OpenVZ 38% faster than XenServer and more than x2 times faster than HyperV and ESXiunder high load.* OpenVZ shows the best response time over solutions tested: OpenVZ has 33% better response time than compared to ESXi and x2 times better response time than XenServer and HyperV