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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LEARN ABOUT HPUX
dma32_pool_size
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)