[Bug 1752440] Re: Lshw incorrectly detects amount of RAM in system

[Lee Trager]

lshw shows two banks of memory but MAAS is still correctly calculating
the output from lshw. There are twelve occurrences of the line <size
units="bytes">34358689792</size> which is 384GB. I looked up the part
number reported by lshw, 72ASS8G72LZ-2G3B2. According to [1] each DIM
should be 64G, not 32G. There is a commit upstream [2] which adds
support for DDR4 RAM and another [3] which adds support for larger
amounts of RAM found in DDR4 RAM. As [1] says this module is DDR4 I
suspect the version of lshw in Ubuntu needs both these patches.

@dgrosvenor could you try building lshw in rescue mode to confirm?

sudo apt install git gcc make
git clone https://github.com/lyonel/lshw.git
make
sudo ./lshw -xml > lshw.log

[1] https://www.micron.com/parts/modules/ddr4-sdram/mta72ass8g72lz-2g3
[2] https://github.com/lyonel/lshw/commit/0ea2e95b3ccdeb3834bec6fe22d0794a65e8c37a
[3] https://github.com/lyonel/lshw/commit/ab43c697ebaff3e5138c43a39a17f69859cde87d

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https://bugs.launchpad.net/bugs/1752440

Title:
  Lshw incorrectly detects amount of RAM in system

Status in MAAS:
  Triaged
Status in lshw package in Ubuntu:
  Incomplete

Bug description:
  When commissioning our new servers, we are only seeing 50% of the
  memory show up in the MaasUI. Looking at lshw, it looks like only 12
  of the 24 DIMMs are listed (we see 384GB but we have 768GB).
  Everything else seems to be fine, number of cores, disks, etc... When
  running free on the machine, we get the expected amount of RAM (768GB)

  Current:
  384GB

  Expecting
  768GB

  root at maas:~# dpkg -l '*maas*'
  Desired=Unknown/Install/Remove/Purge/Hold
  | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
  |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
  ||/ Name                    Version          Architecture     Description
  +++-=======================-================-================-===================================================
  ii  maas                    2.3.0-6434-gd354 all              "Metal as a Service" is a physical cloud and IPAM
  ii  maas-cli                2.3.0-6434-gd354 all              MAAS client and command-line interface
  un  maas-cluster-controller <none>           <none>           (no description available)
  ii  maas-common             2.3.0-6434-gd354 all              MAAS server common files
  ii  maas-dhcp               2.3.0-6434-gd354 all              MAAS DHCP server
  ii  maas-dns                2.3.0-6434-gd354 all              MAAS DNS server
  ii  maas-proxy              2.3.0-6434-gd354 all              MAAS Caching Proxy
  ii  maas-rack-controller    2.3.0-6434-gd354 all              Rack Controller for MAAS
  ii  maas-region-api         2.3.0-6434-gd354 all              Region controller API service for MAAS
  ii  maas-region-controller  2.3.0-6434-gd354 all              Region Controller for MAAS
  un  maas-region-controller- <none>           <none>           (no description available)
  un  python-django-maas      <none>           <none>           (no description available)
  un  python-maas-client      <none>           <none>           (no description available)
  un  python-maas-provisionin <none>           <none>           (no description available)
  ii  python3-django-maas     2.3.0-6434-gd354 all              MAAS server Django web framework (Python 3)
  ii  python3-maas-client     2.3.0-6434-gd354 all              MAAS python API client (Python 3)
  ii  python3-maas-provisioni 2.3.0-6434-gd354 all              MAAS server provisioning libraries (Python 3)

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