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DIMM Capacity Intermixing

frederick hannah
Super Advisor

DIMM Capacity Intermixing

I have an rp7400 with 24GB of memory @ 1GB per chip (3 full carriers). I want to increase the memory capacity by adding more chips, but they are only 512MB per DIMM. Would adding the diffent "sized" DIMMs cause performance issues
or are they special instructions when mixing DIMMs of different capacities? The server is HPUX 11.11.
7 REPLIES
Patrick Wallek
Honored Contributor

Re: DIMM Capacity Intermixing

When adding RAM to a server, the rule is to have the highest capacity DIMMs in the lowest numbered slots.

Torsten.
Acclaimed Contributor

Re: DIMM Capacity Intermixing

You can "mix" them by following special rules.

Example:

2x 1GB on ext 0
2x 1GB on ext 1
2x 1GB on ext 2
...
(until all 1GB are installed)
...
2x 512MB on ext 0
...
(until all are installed)

Hope this helps!
Regards
Torsten.

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frederick hannah
Super Advisor

Re: DIMM Capacity Intermixing

The 1GB chips have occupied three extenders. I have room for only one extender which would have nothing but 512MB chips. Is such a configuration doable?
Patrick Wallek
Honored Contributor

Re: DIMM Capacity Intermixing

You would need to migrate some of the 1GB Dimms to the 4th memory extender.

Essentially,

1 GB in ext0
1 GB in ext1
1 GB in ext2
1 GB in ext3

Do this until all your 1 GB DIMMs are used, then start with the 512 MB DIMMs.

512 MB in ext0
512 MB in ext1
512 MB in ext2
512 MB in ext3

Until all of your 512 MB are used.
Torsten.
Acclaimed Contributor

Re: DIMM Capacity Intermixing

Exactly.

No gaps! If you cannot equip all extenders with the same amount of similar dimms, just continue with the smaller size.

Hope this helps!
Regards
Torsten.

__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.

__________________________________________________
No support by private messages. Please ask the forum!

If you feel this was helpful please click the KUDOS! thumb below!   
Patrick Wallek
Honored Contributor

Re: DIMM Capacity Intermixing

OK, if you want to add 512MB DIMMs so that you have ALL memory slots filled in 4 carriers (upgrading from 1 GB DIMMs in 3 carriers) you would have:

1 GB DIMM in slot 0a/b - ext0
1 GB DIMM in slot 0a/b - ext1
1 GB DIMM in slot 0a/b - ext2
1 GB DIMM in slot 0a/b - ext3
1 GB DIMM in slot 1a/b - ext0
1 GB DIMM in slot 1a/b - ext1
1 GB DIMM in slot 1a/b - ext2
1 GB DIMM in slot 1a/b - ext3
1 GB DIMM in slot 2a/b - ext0
1 GB DIMM in slot 2a/b - ext1
1 GB DIMM in slot 2a/b - ext2
1 GB DIMM in slot 2a/b - ext3
512 MB DIMM in slot 3a/b - ext0
512 MB DIMM in slot 3a/b - ext1
512 MB DIMM in slot 3a/b - ext2
512 MB DIMM in slot 3a/b - ext3
512 MB DIMM in slot 4a/b - ext0
512 MB DIMM in slot 4a/b - ext1
512 MB DIMM in slot 4a/b - ext2
512 MB DIMM in slot 4a/b - ext3

So you now have a total of 32 DIMMs over 4 memory carriers.
frederick hannah
Super Advisor

Re: DIMM Capacity Intermixing

Thanks for the help. I am golden now.