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Full Discussion: Cannot see extra Memory
Operating Systems Linux Red Hat Cannot see extra Memory Post 302631959 by Duffs22 on Saturday 28th of April 2012 03:00:23 PM
Old 04-28-2012
Cannot see extra Memory

Hi,

I upgraded the physical memory on my RHEL5 server (BL460cG7) from 32G to 128G. When I rebooted the box I can see from the "hpasmcli" that the 128G memory has installed correctly.

However when I run a "free" command I can only see 64G of physical RAM? Is there a restriction on the max amount of memory a RHEL5 32-bit server can use? If not is there a parameter that needs updating in order for the extra memory to be seen by the OS?

R,
D.
 

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dma32_pool_size(5)						File Formats Manual						dma32_pool_size(5)

NAME
dma32_pool_size - the amount of memory to reserve for the 32-bit DMA pool VALUES
Minimum Maximum Default Specify an integer value. DESCRIPTION
This tunable specifies the amount of memory in the first 4GB of the physical address space to be reserved for DMA for 32-bit cards. The memory is set aside at boot time and cannot be used for other purposes. This is required only on some Itanium platforms. On platforms where the 32-bit pool is not needed, this value is ignored. The value of this tunable should be set based on the number of 32-bit cards in the system and the type of cards. Related Parameters None WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of HP-UX. Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation, some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun- able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was factory installed on your system, see at AUTHOR
was developed by HP. SEE ALSO
None Itanium(R)-based System Only Tunable Kernel Parameters dma32_pool_size(5)
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