RHEL 5.3 Dell 1750s not seeing 8GB RAM
I have a rack of Dell 1750s running RHEL 5.3 and we just upgraded the memory from 4GB to 8GB. When the machine boots, the BIOS probes out 8GB, but the boot scroll (dmesg) only shows 4GB, as seen after we login. How can I get it to see all of the mem?
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Are you running a 32 bit kernel or 64 bit?
If 32, try the PAE kernel. |
It is 32 bit. So it is not anything to do with maybe the BIOS needs upgrading? It is really old.
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You either need to switch to a PAE kernel or switch to 64bit. Since you have a rack I would try both and see what is faster. When you use 32bit each application is limited to 3.2Gb(about).
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OK, thanks for responding.
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32bit Linux can only address up to 3gb of ram.
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Thanks SZboardstretcher!
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32bit CAN address more than 3gb of ram, IF you use a PAE kernel. However(if I was not clear above) even with a PAE kernel each apllication can only address about 3Gb. With 8Gb of ram and a PAE kernel you could have two applications using 3Gb each and still have plenty of ram for buffers(etc).
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Quote:
You are correct that PAE will allow you access to more. According to WikiPedia @ http://en.wikipedia.org/wiki/Physical_Address_Extension Quote:
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The important part is this:
Quote:
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