VSAN - Performance/license associated mystery

Howdy,

I received a few questions about VSAN and SSD. I hope some of you can help me there / or has already answered this question.

In my setup, I had 4 servers configured in a database server cluster. Each server has 2 SAS SSD where an SSD is used as cache flash and another hard drive SSD are used to capacity. ESXI is installed on a separate DOM. SATA

  1. 1. when I first set up these servers using PuTTY and ssh shows two SSDS like all flash SSD in vSphere client web. More about they are configured as "IsSSD = 1" and "IsCapacityFlash = 0".

bilde1.jpg

bilde2.jpg

This shows both according to the type of flash in vsphere client to web.

bilde3.jpg

When I set up SSD now using the web client vSphere or ssh an SSD displayed flash and another show as a HARD drive. There should be no specific difference in either of these approaches to what I did before. However, I can't two SSDS to redisplay as 'Flash' under player type.

So my question here is basically if there is a significant difference of using either of these approaches to the marking of the SSD.

One thing I think is, for example, performance; If I tag an SSD as a regular HDD using vSphere client of web performance will be reduced to a hybrid solution on this specific server? Or will there be no associated performance the difference? It shows essentially just like a HARD drive, but the performance is still similar to SSD & All-flash solution. It is a conclusion that I opted for some time, but now I'm kind of unsure.

When will "peripheral storage" show two SSD Flash under "Type of drive. This is one of the reasons why I ignored if they show that the HARD drive under vSandatastore-> manage-> settings-> device backup like the photo above.

bilde4.jpg


Note! After the server in maintenance mode Setup, restart and exit maintenance mode see the two SSDS as 'Flash' again.


However: The additional license all-flash is required to use the VSAN and necessary to give all-flash performance? Or it could fall and only ordinary VSAN license is required to give all-flash performance?

Best regards

A little confused new members first post

(a) its performance hybrid not entirely, because the device is still faster than a normal HARD drive. But you also have not found full Flash performance. So, something between the two.

(b) SSH + CLI or RVC, Yes. You cannot do it from the user interface in the initial support of the All-Flash (at the time of writing these, July 2015).

Tags: VMware

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