vSphere LUN and path maximums

This week I had question from our field concerning a customer and LUN/device maximums which I think is useful to share. The customer was running vSphere 6.5 which supports 512 LUNs per ESXi host (per target/array) but they were unable to see any beyond 255. Now before 6.5, I frequently heard from customers who hit...

TechBook update for PowerMax

Well PowerMax has been out for a few months now but I only just finished my VMAX/PowerMax/VMware TechBook update here. It's always a bear to be perfectly honest since it encompasses all best practices but the blog can only buy me so much time before we need it in official form. I've managed to get...

Online SRDF device expansion – SRDF/Metro

As I mentioned in my post on SRDF online device expansion, we do not yet support online expansion of SRDF/Metro devices (until 5978.444.444). There are some SRDF enhancements in PowerMaxOS, however, which can get you pretty close so I thought it might be worthwhile to explain how to do that. We now support moving SRDF/Metro...

Online SRDF device expansion with PowerMaxOS

Beginning with PowerMaxOS on both the VMAX All Flash and PowerMax arrays, Dell EMC supports dynamic, online expansion of all SRDF pairs except SRDF/Metro (check this post for a workaround of sorts). Expansion prior to the introduction of PowerMaxOS, requires dissolving the SRDF pair, expanding each device independently and then re-creating the pair. This is...