Have you considered building a live PXE linux image with a automated fw update process?
- booting the pxe-image can be triggered trough a simple script that controls the dhcp server
- changing the boot order can be automated through ilo3/ilo4 (one time)
- downtime would be around 10-15min
I have experienced similar issues with esxi6 and OmniOS recently where esxi would not
see any luns but other initiators (Linux,Win) would have no problems (with custom defined host-group
instead of the default "ALL")
But in my case i was running omnios on baremetal not virtualised, so my...
modder man: I was referencing the earlier post from TuxDude which explained a typical(realistic) upgrade procedure. Since you didn't state how many blades you manage and didn't correct the 300 servers he mentioned I assumed it was at least in the same ballpark.
With this new information in mind...
How does cisco gear help with firmware/esxi updates if you cannot take the blades off-line?
You should describe a little more your upgrade procedure that took 18mo because the
bottleneck isn't obvious, like `TuxDude` said one guy would have no problem
doing these upgrade in under...