8.0

Table Of Contents
Recommendations for Enhanced ESXi Performance
To enhance performance, install or upgrade ESXi on a robust system with more RAM than the
minimum required and with multiple physical disks.
For ESXi system requirements, see ESXi Hardware Requirements.
Table 4-5. Recommendations for Enhanced Performance
System Element Recommendation
RAM ESXi hosts require more RAM than typical servers. ESXi
8.0 requires a minimum of 8 GB of physical RAM. Provide
at least 12 GB of RAM to take full advantage of ESXi
features and run virtual machines in typical production
environments. An ESXi host must have sufficient RAM to
run concurrent virtual machines. The following examples
are provided to help you calculate the RAM required by
the virtual machines running on the ESXi host.
Operating four virtual machines with
Red Hat Enterprise Linux or Windows XP requires at
least 3 GB of RAM for baseline performance. This figure
includes 1024 MB for the virtual machines, 256 MB
minimum for each operating system as recommended by
vendors.
Running these four virtual machines with 512 MB RAM
requires that the ESXi host have 4 GB RAM, which includes
2048 MB for the virtual machines.
These calculations do not include possible memory savings
from using variable overhead memory for each virtual
machine. See
vSphere Resource Management
.
Dedicated Fast Ethernet adapters for virtual machines Place the management network and virtual machine
networks on different physical network cards. Dedicated
Gigabit Ethernet cards for virtual machines, such as
Intel PRO 1000 adapters, improve throughput to virtual
machines with high network traffic.
Disk location Place all data that your virtual machines use on
physical disks allocated specifically to virtual machines.
Performance is better when you do not place your virtual
machines on the disk containing the ESXi boot image. Use
physical disks that are large enough to hold disk images
that all the virtual machines use.
VMFS6 partitioning The ESXi installer creates the initial VMFS volumes on
the first blank local disk found. To add disks or modify
the original configuration, use the vSphere Client. This
practice ensures that the starting sectors of partitions are
64K-aligned, which improves storage performance.
Note For SAS-only environments, the installer might not
format the disks. For some SAS disks, it is not possible
to identify whether the disks are local or remote. After
the installation, you can use the vSphere Client to set up
VMFS.
VMware ESXi Installation and Setup
VMware, Inc. 21