7.0

Table Of Contents
n Starting with ESXi 7.0 Update 3, if the boot device is a USB or SD card with no local persistent
storage, such as HDD, SSD, or a NVMe device, the VMware Tools partition is automatically
created on the RAM disk. For more information, see Knowledge Base article 83376.
n If you assign the /scratch partition to a USB or SD card with no local persistent storage,
you see warnings to prevent you from creating or configuring partitions other than the boot
bank partitions on flash media devices. For best performance, set the /scratch partition on
the RAM disk. You can also configure and move the
/scratch partition to a SAN or NFS. For
more information, see Knowledge Base article 1033696.
n You must use an SD flash device that is approved by the server vendor for the particular server
model on which you want to install ESXi on an SD flash storage device. You can find a list of
validated devices on partnerweb.vmware.com.
n See Knowledge Base article 85685 on updated guidance for SD card or USB-based
environments.
n To chose a proper SD or USB boot device, see Knowledge Base article 82515.
Caution If a local disk cannot be found, or the boot media is a USB or SD device without an
additional durable storage for persistent data, then the /scratch partition is on the RAM disk,
linked to /tmp, and ESXi 7.0 operates in degraded mode.
When in degraded mode, you see a System Alert such as: ALERT: No persistent storage
available for system logs and data. ESX is operating with limited system
storage space, logs and system data will be lost on reboot.
When ESXi 7.0 operates in degraded mode, the consumption of RAM for logs might result in
nonpersistent logs, possible failure to log or out of memory condition for temporary data. A
possible side effect is slow booting due to the time spent for rebuilding of the disk state.
Use persistent storage of sufficient size to prevent degraded mode. You can reconfigure /
scratch to use a separate disk or LUN.
The upgrade process to ESXi 7.0 repartitions the boot device and consolidates the original core
dump, locker, and scratch partitions into the ESX-OSData volume.
The following events occur during the repartitioning process:
n If a custom core dump destination is not configured, then the default core dump location is a
file in the ESX-OSData volume.
n If the syslog service is configured to store log files on the 4 GB VFAT scratch partition, the log
files in var/run/log are migrated to the ESX-OSData volume.
n VMware Tools are migrated from the locker partition and the partition is wiped.
VMware ESXi Installation and Setup
VMware, Inc. 16