vmware ver6.0

We have an old esxi ver4.1 and time to replace this with ver6.0.
Single esxi about 2TB storage.
Should i go for a server with ssd drive for os and rest sas drive for storage?
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ESXi doesn't need a fast disk. Best practice is to install it to an SD card or USB stick. It loads fully into RAM so the speed is optimal once loaded. It doesn't need to be large, 4GB is enough. Most servers that are certified for ESXi have internal SD card or USB slots exactly for this.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would recommend that ALL ESXi installations, are installed on a USB Flash drive or SD card.

Just remember to use the OEM ESXi version from your vendor for your server, e.g. IBM, HP, DELL, Fujitsu etc

an 8GB or 16GB high quality flash drive, e.g. SanDisk, Kingston, HP, Lexar.

We've been installing on flash drives since 2004, the flash drive is only read at BOOT, and then goes memory resident, so there is no advantage of wasting money on an SSD.

Here is the VMware KB on installing 5.x on USB/SD:

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