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Full Discussion: Redhat 2.1 AS Memory Limit?
Operating Systems Linux Ubuntu Redhat 2.1 AS Memory Limit? Post 302250769 by Cbish68 on Friday 24th of October 2008 07:44:36 AM
Old 10-24-2008
Question Redhat 2.1 AS Memory Limit?

I have a customer with an HP DL380 G4 server running Redhat 2.1 AS that has 4GB memory installed. They want to upgrade in the server to the maximum of 12GB using (6) 2GB DIMMs. I can do this for them, but I read somewhere that Redhat 2.1 has an upper memory limit. Or you need a kernel patch to use memory above a certain range. Does anyone out there know the details of these restrictions?

Here is the Redhat release and kernel info from the server:

# cat /etc/redhat-release
Red Hat Linux Advanced Server release 2.1AS (Pensacola)
# uname -a
Linux server003.mydomain.net 2.4.9-e.57smp #1 SMP Thu Dec 2 20:51:12 EST 2004 i686 unknown


Thanks!

Last edited by Cbish68; 10-28-2008 at 03:20 PM..
 

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STRCTLSZ(5)							File Formats Manual						       STRCTLSZ(5)

NAME
STRCTLSZ - maximum size of streams message control (bytes) VALUES
Failsafe Default Allowed values Recommended values DESCRIPTION
limits the maximum number of bytes of control data that can be inserted by in the control portion of any streams message on the system. If the tunable is set to zero, there is no limit on how many bytes can be placed in the control segment of the message. returns if the buffer being sent is larger than the current value of Who Is Expected to Change This Tunable? Any customer. Restrictions on Changing Changes to this tunable take effect at next reboot. When Should the Value of This Tunable Be Raised? The tunable should be increased by any customer if the customer's STREAMS module/driver(s) require more bytes in the control portion of any streams message than the current value. What Are the Side Effects of Raising the Value of This Tunable? The kernel will use more memory. During low memory situations, it may bring down system performance due to frequent swapping. When Should the Value of This Tunable Be Lowered? The tunable could be lowered by any customer if the customer's STREAMS module/driver(s) do not require a longer message size in the control portion than the current value. What Are the Side Effects of Lowering the Value of This Tunable? Possible improper functioning in any of the STREAMS module/driver(s). Possible performance degradation, particularly in networking. What Other Tunable Should Be Changed at the Same Time as This One? 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. Tunable Kernel Parameters STRCTLSZ(5)
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