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12-16-2013 10:52 PM
12-16-2013 10:52 PM
OEL 5.9 not recognizing total installed RAM.
Hi all,
we are facing problem after upgrading RAM to 64GB, previously our system was running with 32GB, with oracle enterprise linux 5.9.
recently we upgraded it to 64GB in the system hardware its showing all 64GB but from OS side its showing only 32GB.
How can i get all 64GB usable.
# uname -a
Linux XXXXXXXXXXXXX 2.6.18-348.el5xen #1 SMP Wed Jan 9 08:32:18 PST 2013 x86_64 x86_64 x86_64 GNU/Linux
]# cat /proc/meminfo
MemTotal: 33554432 kB
MemFree: 26679220 kB
Buffers: 203628 kB
Cached: 744152 kB
SwapCached: 0 kB
Active: 5372380 kB
Inactive: 535884 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 33554432 kB
LowFree: 26679220 kB
SwapTotal: 33554424 kB
SwapFree: 33554424 kB
Dirty: 140 kB
Writeback: 0 kB
AnonPages: 4960656 kB
Mapped: 52028 kB
Slab: 150560 kB
PageTables: 31776 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 50331640 kB
Committed_AS: 10139772 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 18092 kB
VmallocChunk: 34359719735 kB
# dmidecode -t 16
# dmidecode 2.11
SMBIOS 2.7 present.
Handle 0x1000, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 384 GB
Error Information Handle: Not Provided
Number Of Devices: 12
Handle 0x1001, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 384 GB
Error Information Handle: Not Provided
Number Of Devices: 12
dmidecode -t 17 |grep Size
Size: 8192 MB
Size: No Module Installed
Size: No Module Installed
Size: 8192 MB
Size: No Module Installed
Size: No Module Installed
Size: No Module Installed
Size: No Module Installed
Size: 8192 MB
Size: No Module Installed
Size: No Module Installed
Size: 8192 MB
Size: 8192 MB
Size: No Module Installed
Size: No Module Installed
Size: 8192 MB
Size: No Module Installed
Size: No Module Installed
Size: No Module Installed
Size: No Module Installed
Size: 8192 MB
Size: No Module Installed
Size: No Module Installed
Size: 8192 MB
Thanks !
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12-17-2013 06:51 AM
12-17-2013 06:51 AM
Re: OEL 5.9 not recognizing total installed RAM.
> # uname -a
> Linux XXXXXXXXXXXXX 2.6.18-348.el5xen #1 SMP[...]
You're running a Xen kernel, so the "missing" memory might be in use by other Xen domains (=VMs), or kept free by the Xen hypervisor so that you can add a new domain.
What is the output of "xm info | grep memory" command?
Are you using the "dom0_mem" boot option in /boot/grub/grub.conf?
This might be useful. It is written for Oracle VM, but is valid for other Xen setups too:
https://blogs.oracle.com/wim/entry/understanding_memory_allocation_in_oracle
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12-17-2013 09:08 PM
12-17-2013 09:08 PM
Re: OEL 5.9 not recognizing total installed RAM.
HI
thanks for your replay, we didn't configure any domains in this server and the output of the said command
What is the output of "xm info | grep memory" command?
xm info |grep memory
Error: Unable to connect to xend: No such file or directory. Is xend running?
Are you using the "dom0_mem" boot option in /boot/grub/grub.conf?
no
#boot=/dev/cciss/c0d0
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Oracle Linux Server (2.6.18-348.el5xen)
root (hd0,0)
kernel /xen.gz-2.6.18-348.el5
module /vmlinuz-2.6.18-348.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb
quiet
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12-17-2013 11:41 PM
12-17-2013 11:41 PM
Re: OEL 5.9 not recognizing total installed RAM.
With that /boot/grub/grub.conf, you are running Xen as the hypervisor and OEL 5.9 as its dom0 domain (= the special Xen domain that manages the physical I/O). The dom0 domain is created automatically, since it must always exist whenever a Xen environment is running.
The memory restriction is a limitation of the Xen hypervisor: the dom0 domain can have a maximum of 32 GiB of memory in this version. The rest is available for domU domain(s). Since the applications should normally be run in domU domains, not in dom0, this is not normally an issue.
(In a normal situation, you might even want to restrict your dom0 size to smaller than 32 GiB, to leave more memory for your domUs - that can provide better performance than relying on dom0 memory ballooning to auto-manage memory between domUs and dom0.)
If you are not planning to run any domU domains, why are you running the Xen kernel at all? In that situation, I think it only adds extra restrictions, complexity and overhead for you.
If you installed your system with the "everything" option, this is one of the reasons why that is not always a good idea.