HP Proliant will not use all of its RAM

Blue Banana

Blue Banana

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Help me figure out what I'm doing wrong. HP Proliant ML150 G6. One CPU installed. We installed three of these modules:
https://memory.net/product/m393b1g7...1600-rdimm-pc3l-12800r-single-rank-x4-module/
When posting, the server displays invalid memory population message but contunes to boot into Windows Server 2008 R2. The system reports 24GB installed and 16GB usable. I tried a few different configs with the modules, taking one out, makes the system beep. Not sure why it's not working properly.

I read through the manual here: http://content.etilize.com/User-Manual/1015372387.pdf
As well as the memory config page here:
http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01810886

Unless I'm missing something totally obvious, I'm sot sure why not all the RAM is being used and the invalid memory message is displayed.
 
mraikes said:
Maybe because it's a single CPU? Some add'l info here: http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01715581&sp4ts.oid=3884323

"If only one processor is installed in a 2CPU system, only half of the DIMM slots are available"
Click to expand...

There are two ranks of RAM slots, one for each CPU. I doubt this is what they mean. Previously there were 3x 4GB and 2x 2GB modules installed in this rank, mixed brands also.

mainboard-servidor-hp-proliant-ml150-g5-dl180-461511-001-D_NQ_NP_20313-MPE20188818033_102014-F.jpg
 
When you take the cover off an HP server, the inside of the cover will have a big diagram of the mobo, including showing you the order to populate the RAM.
Servers can be picky about this, and they're very specific with their RAM. I'd avoid mix-matching RAM, this isn't a desktop system. Get the exact RAM certified for this server and install it according to instrux.
 
Maybe I'm having an ID ten T moment, but don't these have to be installed in pairs? Got a picture of how it's installed with the new 3 chips?
 
For some review..
http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c01715581&sp4ts.oid=3884323

HP ProLiant ML150 G6 Server - Configuring Memory
Memory population guidelines

Standard memory

Memory options

Memory population guidelines
When adding or replacing memory, follow the DIMM installation guidelines that are summarized below:
  • For the HP ProLiant ML150 G6 server with twelve (12) memory slots

  • There are three (3) channels per processor; six (6) channels per server

  • There are two (2) DIMM slots for each memory channel; twelve (12) total slots

  • Memory channel 1 consists of the two (2) DIMMs that are closest to the processor

  • Memory channel 3 consists of the two (2) DIMMs that are furthest from the processor

  • DIMM slots that are white should be populated first

  • Do not mix Unbuffered memory (UDIMMs) with Registered memory (RDIMMs)

  • Do not install DIMMs if the corresponding processor is not installed

  • If only one processor is installed in a 2CPU system, only half of the DIMM slots are available

  • To maximize performance, balance the total memory capacity between all installed processors

  • It is not required, but it is recommended to load the channels similarly if possible

  • You can only have up to eight (8) ranks installed per channel

  • You can only install two quad-rank DIMMs per channel

  • You can only install two UDIMMs per channel; if available, the third slot in the channel must remain empty

  • Populate DIMMs from heaviest load (quad-rank) to lightest load (single-rank) within a channel

  • Heaviest load (DIMM with most ranks) within a channel goes furthest from the chipset

  • For memory mirroring mode, channel 3 must be unpopulated. Channels 1 and 2 are populated identically

  • For lock-step mode, channel 3 must be unpopulated. DIMMs in channels 1 and 2 will be installed in pairs. The paired slots will be 1,4; 2,5; 3;6 on a 3DPC system or 1,4; 2,5; on a 2DPC system

  • No mixing DIMM voltage; all DIMMs must be the same voltage
Specific part numbers for HP RAM kits are in above link...
 
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