I've attached a Best Practices for VNX - this is for an earlier version (Flare 31.5) but the basics are the same. Review Chapter 5 (pg 113), this has a lot of the information about configuring Raid Groups and Pools for best performance.  You can also collect a set of spcollects (both SPA and SPB - or you can use USM to collect the spcollects - it creates a single zipped file) and a couple of sequential NAR files, zip them all up into one zip, and you can then submit these to a site that will review the data and create a report showing you the current performance on the array (this is provided as a service by EMC).  I would suggest that you configure Data Logging to run the "Archive Interval" at 300 seconds (this will create a new NAR file every 13.1 hours) with "Periodic Archiving" enabled and let it run for some period of time m(say a couple of days or 7 days) that covers the time when you experience host latency issues. If you see issues each day, then change the Archive Interval to 60 seconds (one new NAR file every 2.6 hours) and collect the NAR files at the end of 24 hours (you should have about 10 or 11 files). Always "Stop" "Data Logging" when making changes, then Start once changes have been completed. When submitting the NAR files, only use the ones from either SPA or SPB, but not both. Remember, the spcollects and NAR files need to be in one zip file.  [URL]#loginPage  You'll need to create a new user account. The reports created are very detailed.  glen
Hi  I'm planning to configure newly purchased VNX 7600 by my company. I need some suggestions to configure Pool [FASTVP] or Raid group [Fast Cache].  Following are disk available for POOL and RAID group.  25 SSD disks - 200G*    -- correction 260 SAS disks- 10K  - 900G 96 NL-SAS disks  -7.2K - 3T  which combination I should choose ?  if I create pool [FAST VP] "Extreame performance [4+1], performance [4+1], capacity [6+2] what should be Pool size in order to get max. utilization  + high I/O performance? and what should be the size of FAST CACHE?  Any suggestion would be highly appreciated  Thanks in advance, /aman
VNX FAST VP/FAST CACHE- Pool vs raid group