VMware VS4-ENT-PL-A - vSphere Enterprise Plus, Setup Manual, Page: 259 / 276

When you reboot the ESXi host after installing the ESXi image, the host configures the system storage
devices with default settings. By default, all visible blank internal disks are formatted with VMFS, so you
can store virtual machines on the disks. In ESXi Embedded, all visible blank internal disks with VMFS are
also formatted by default.
C
AUTION
ESXi overwrites any disks that appear to be blank. Disks are considered to be blank if they do not
have a valid partition table or partitions. If you are using software that uses such disks, in particular if you
are using logical volume manager (LVM) instead of, or in addition to, conventional partitioning schemes,
ESXi might cause local LVM to be reformatted. Back up your system data before you power on ESXi for the
first time.
On the hard drive or USB device that the ESXi host is booting from, the disk-formatting software retains
existing diagnostic partitions that the hardware vendor creates. In the remaining space, the software creates
the partitions described in Table 8-3 .
Table 8
‑
3. Partitions Created by ESXi on the Host Drive
ESXi Version Partitions Created
ESXi Installable For fresh installations, several new partitions are created
for the boot banks, the scratch partition, and the locker.
Fresh ESXi installations use GUID Partition Tables (GPT)
instead of MSDOS-based partitioning. The partition table
itself is fixed as part of the binary image, and is written to
the disk at the time the system is installed. The ESXi
installer leaves the scratch and VMFS partitions blank and
ESXi creates them when the host is rebooted for the first
time after installation or upgrade. One 4GB VFAT scratch
partition is created for system swap. See “About the
Scratch Partition,” on page 260. The VFAT scratch
partition is created only on the disk from which the ESXi
host is booting.
N
OTE
To create the VMFS volume and a scratch partition
with the installation, the ESXi installer requires a minimum
of 5.2GB of free space on the installation disk.
The installer affects only the installation disk. The installer
does not affect other disks of the server. When you install
on a disk, the installer overwrites the entire disk. When the
installer autoconfigures storage, the installer does not
overwrite hardware vendor partitions. During ESXi
installation, the installer creates a 110MB diagnostic
partition for core dumps.
ESXi Embedded One 110MB diagnostic partition for core dumps, if this
partition is not present on another disk. The VFAT scratch
and diagnostic partitions are created only on the disk from
which the ESXi host is booting. On other disks, the
software creates one VMFS5 partition per blank disk, using
the whole disk. Only blank disks are formatted.
Both ESXi Installable and ESXi Embedded One VMFS5 partition on the remaining free space.
You might want to override this default behavior if, for example, you use shared storage devices instead of
local storage. To prevent automatic disk formatting, detach the local storage devices from the host under the
following circumstances:
n
Before you start the host for the first time.
n
Before you start the host after you reset the host to the configuration defaults.
To override the VMFS formatting if automatic disk formatting already occurred, you can remove the
datastore. See the vCenter Server and Host Management documentation.
Chapter 8 Setting Up ESXi
VMware, Inc. 259