Welcome to this EMC Support Community Ask the Expert conversation.This ATE session focuses on VMAX best practices. Within the VMAX product there are many options to consider when allocating hosts to an array. Depending on workload profile, host setup etc. it is critical to get the right setup in order to optimize performance. It is also key to use tools like Unisphere to monitor that workload to ensure best performance. The key thing is to specifically ensure that the FA (front end) and Lun configuration are optimum.
Kevin Gleeson is a Technical Account Manager at EMC.
He has been with EMC for the last 18 years. Kevin has spent 15 years supporting EMC Symmetrix product range at many levels. For the last 5 years he has worked in the Symmetrix Level 2 group specializing in performance. In 2012 he moved to the role Technical Account Manager supporting an EMC Elite Customer. Kevin was also recently named as a member of EMC’s Technical Leadership Academy.
This discussion begins on March 24 and concludes on April 11. Get ready by following this page to receive updates in your activity stream or through email.
Recently my organization has been on a dashboard kick. We're building a VMAX performance dashboard in vCops using the SMI-S provider hooks. Some of the statistics we ned to show are FA health including CPU and MB/s. The challenge i'm running into is knowing the max MB/s an FA/FA (They would like to see IO/s as well, but that isn't feasible). Not limited to FA MB/s, but other status as well.
Does such a document list which give guidelines as to what are acceptable numbers? I realize each environment is different, but information on how to get to those number for specific environments would be nice.
Can you speck in generalities how specific settings / practices to achieving the most performance form a VMAX? obviously things like spreading your workload, etc, but any more details such as changing the PRC on the SSD pool if you'll never bind a lun to that pool?
Is there a rule of thumb about the amount of hosts that should be attached to a single FA port? And how many ports would you advise to be used for a single host?
I remember when I first installed a Symmetrix 10 or 12 years ago we talked a lot about this - Fan/in Fan/Out ration. You don't hear as much about this anymore.
The answer has to be it depends.
1. on expected workload for each host.
2. on expected growth.
3. it has to be noted that while there is 2 ports on an FA there is Single CPU to Manage workload between both.
From a best practice perspective you really need to start by using 4 port across 4 different FA CPU's .
If the workload is expected to be IO intensive, heavy thruput or most importantly respsonse tme critical it well worth considering 6 or 8 ports again spread on 6 or 8 different CPU's .
This will help avoid future issues relating to excessive utilization of CPU and or excessive queuing on the FA itself
Fan in and Fan Out ratio is a good principal.
My recommendation would be to look at Utilization rates and queuing rates on the FA's using unisphere performance monitoring tools. Where possible add to the less utilized FA's and you should end up with a very balanced front end on the VMAX thus getting optimum IOPS and response times.