A flash drive/card is used only for loading ESXi and saving configuration files when it is necessary. Due to the fact that ESXi is loaded completely into a computer’s RAM, the input/output is not reduced during regular ESXi operation. ESXi boot time is longer when ESXi is installed on a USB device or flash card.Hence, less time and effort is needed to do this. Even if you need to re-install ESXi on your USB flash drive, you don’t need to copy datastore data. If something goes wrong, just replace the USB flash drive to the flash drive with the previously installed ESXi version that works properly (without spending time to roll back to the previous version). Upgrades and installations can be done much easier. Clone your USB flash, and upgrade ESXi.In cases when ESXi is installed on a disk that is used also as a datastore, you may need to re-install ESXi on a new disk or clone the installed ESXi system to a new disk. You can replace the datastore disks without reinstalling ESXi since ESXi is installed on a USB flash drive (SD card). Ease of maintenance when you need to replace disks used for a datastore. Using a USB flash drive to run ESXi can save you from buying additional disks. If you want to install ESXi on a standalone disk or disk array, you should expect to encounter additional costs. Cost savings. Disks with SAS interface are not exactly low in price.There are advantages and disadvantages that you should know before making a decision to run ESXi from a USB flash drive. DISCOVER SOLUTION Advantages and Disadvantages
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