FreeNAS not detecting all RAM after reboot but dmidecode does

[Soaringswine]

I'm having a weird problem: I have a FreeNAS box with 32 GB of RAM running FreeNAS 11, everything was fine until I rebooted the machine and now FreeNAS is only showing 24 GB of RAM available.

The BIOS shows 4x 8 GB sticks and "dmidecode -t memory" shows all 4x 8 GB sticks.
dmesg only says real memory = 26289897472 (25072 MB) avail memory = 24893108224 (23739 MB) which is incorrect.
I have nothing under Tunables and Autotune is off.

I've reseated the DIMMs and FreeNAS still only shows 24 GB.

I have definitely seen FreeNAS show all 32 GB previously, so this is a new issue.

 

[Stux]

Failing ram, failing memory slots, or dirty slots.

Try reseating (again) and moving memory about.

 

[Soaringswine]

Failing ram, failing memory slots, or dirty slots.

Try reseating (again) and moving memory about.

done. I swapped all memory locations, same issue.

 

[Soaringswine]

ended up rebooting a bunch and reseating the memory and now FreeNAS shows 32 GB again. let's chock this one up to solar flares..

 

[SweetAndLow]

Hardware specs? Would be super important here and it's part of following the rules.

 

[Soaringswine]

CPU: AMD FX-8320E BLACK
Motherboard: ASROCK 970M PRO3
RAM: G.SKILL Ares DDR3 1600

at this point, the RAM has survived three different builds, so I'm betting that's the root of the issue. and solar flares

 

[Stux]

Sounds like a case of dirty slots/contacts. Hope you have some good memory checks because the likelihood of bit errors high.