ME4 Tiering questions

Hello tommyboy218,

Here is a link to the administrator guide and if you look on page 23 it explains how Tiering is handled.  https://dell.to/39ccBte

Thanks I did read that.

A pool will contain multiple disk groups and will have at least 2 disk groups per pool if 2 different kinds of disk are used.

Lets say that I create multiple volumes and those volumes are set to completely fill the available space in the pools disk groups.

If I understand what I am reading, data that lives on the volume can float between disk types without ever leaving the volume is this correct?

I'm trying to confirm that its not the volume that moves between disks, its the data on the volume.

Hello tommyboy218,

That is correct.  The cold pages/ blocks will move to slower disk to preserve your higher tier drives for frequently accessed data. 

Ok that makes sense.

Having said that, is there any reason for having more than 2 total volumes on the entire san?  (ie 1 for each pool?)

Hello tommyboy218,

That is up to you.  I have known customers that only have 2 volumes on there ME4 systems.  I also have worked with customers that have more than 5 volumes per pool.  It comes down to what types of data and how many hosts are going to be accessing the system.