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I have to add some RAM to my HP Proliant DL385 g7 and I was wondering if I can hot-add the memory due to some mission critical VMs that I can't move because of lack of hardware. I use ESXi 5.5 as HV. I tried to look around HP support site but I didn't find anything. Is it possible ? If yes, Is there any risk or precaution I'd take during the operation ?

0wn3r
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That functionality needs to be supported both by the hardware platform, and by the OS. In your case, the HP Proliant DL385 g7 manual clearly states that a full power off is needed to install new memory modules, and as such I wouldn't even care to check for ESXI support to the functionality.

stoned
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Page 50 of the manual says this:

Installing DIMMs CAUTION: For proper cooling do not operate the server without the access panel, baffles, expansion slot covers, or blanks installed. If the server supports hot-plug components, minimize the amount of time the access panel is open.

  1. Power down the server (on page 22).
  2. Extend the server from the rack (on page 22).
  3. Remove the access panel (on page 23).
  4. Remove the air baffle (on page 28).
  5. Open the DIMM slot latches.
  6. .... {more steps}

So, no. No hot-add, from my reading of the manual.

mfinni
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    In addition, it specifically says that the PCI riser cage needs to be removed and the server *must* be removed from power to do that. – Nathan C Sep 03 '14 at 12:52
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You can hot add ram to the ESXi Guest OS's living on that host.

You will however need to power off the guest during a maintenance period to add RAM to the physical machine.

Travis Stoll
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