redetecting changed DIMM RAM in Redhat box


If I remove or add additional DIMM memory chips into a Redhat (RHES 5.4)
box (DL380 Proliant G7), do I need to issue a command for the server
to redetect the reduced / increased memory?

If so, what's the command?  How do I check it's been detected &
the OS can utilize the additional memory inserted?

What about the swap size?  Do I need to adjust it as well ?
sunhuxAsked:
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wesly_chenCommented:
No, the BIOS will detect the memory change and the RHEL can get the change from BIOS.
So no need to run any command for memory change.

But you might want to adjust swap size if the system swap quite often,
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gheistCommented:
1) your server does not have hot-lug memory, you need to shut it down.
2) if i browse web correctly it has 2 sets of 2x3 sockets, so you need to put a set of 2 or three  same modules at the time.
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farzanjCommented:
If you stuck it in correctly, it should get recognized.

You can issue this commands to check what you have.

Your BIOS
biosdecode

Open in new window


You can also check with the following commands.
dmidecode --type memory

Open in new window


OR you can issue these
vmstat
free -m
top

Open in new window

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farzanjCommented:
You can increase or decrease your swap size.  On Red Hat, you can increase or decrease your swap with a number of ways.

Read this for more info and all commands /ways you may do it.
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/96/html/Storage_Administration_Guide/ch-swapspace.html
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sunhuxAuthor Commented:

Thanks a lot guys.


Hi Gheist,

> it has 2 sets of 2x3 sockets, so you need to put a set of 2 or three  same modules at the time
You mean for Proliant G7, I'll need to insert 2 pcs of DIMM of the same capacity ?  Can you
elaborate on this?  So if I insert 4 pcs of DIMM of the same capacity/type, it's OK?
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gheistCommented:
they are placed in 2x3 array if i got idea right

so you place 2 of them where it is 2 slots in a direction.

PS there is speciall config that a single module works in lowest numbered slot

PPS 3-channel config is 1,5x faster that 2-channel
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gheistCommented:
check www.kingston.com for module layout.
HP proliant firmware CD might be necessary to force redetection.
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sunhuxAuthor Commented:
excellent
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