How to create RamDisk in ESXI 6.7 and host VM's on it ?

[shahid3507]

Hi I was trying to create a RamDisk on ESXI 6.7 and host few linked clones on it in order to get better performance.

I have tried doing it and tried to host and tried to host an Linked clone on it. The VM got registered but didn't get started, here are the steps I performed.

mkdir /ramdisk

esxcli system visorfs ramdisk add -m 10240 -M 20480 -n ramdisk -t /ramdisk -p 0755

Created to linked clone on it but poweron failed leaving this error.

Attempted to power on a virtual machine with the .vmx file not stored on a NAS or VMFS version 3 datastore. The virtual machine files must be relocated or VMFS upgraded.

Is there a way to workaround please tha please let me know.

[VIRTUNET2011101]

If you want the entire VM in RAM, i.e all reads and writes originating from that VM to be serviced from host RAM, then the only way to do that is to use a caching software that caches all IO to RAM. Virtucache is an example

[Scott Vessey]

 

No disclosure this time that you work for the vendor, like the last time you posted?

https://communities.vmware.com/t5/VMware-vSphere-Discussions/Virtual-Flash-Cache-vCenter-6-7-HTML5-UI/m-p/1828542#M18711

 

[continuum]

> No disclosure this time that you work for the vendor, like the last time you posted?

After replying with a 4 years delay to a post about performance I would not want to be connected to the linked company either

[IRIX201110141]

Try

esxcli system settings kernel set -s fakePmemPct -v 25

 

Regards,
Joerg

[FredPhillips]

Just what I needed!  Thank you!

Also, read this https://williamlam.com/2018/05/how-to-simulate-persistent-memory-pmem-in-vsphere-6-7-for-educational-purposes.html