I cut out the text of dmidecode that weren’t necessary for the point:
I couldn’t find the Dell Service Manual for a ‘Dell 770’ but I was looking at the Service Manual for the Optiplex 760, and I saw that the way that the modules are paired isn’t obvious. It looks like you’ve got 2 2G memory modules from 64T256020EU2.5C2 (Kingston?) and 2 2GB
modules from CM2X2048-6400C5 (Corsair?). I suggest finding your service manual, and make sure that the modules are placed in the DIMM
slots and the same vendor RAM is paired with its partner.
It sounds to me like there might just be something weird going on with how the memory is installed. I’m assuming you don’t have an artificial limit in the kernel command line or anything obvious like that.
Jonathan Billings wrote:
Oh, Ghu…. I don’t know about lower-end desktops, but in servers, they
*MUST* be *identical*, even to the point of not being able to mix dual rank with quad rank, even if everything else is the same.
mark
Its dual channel and they are in the right spot, I reseated them
1 pair in black
1 pair in white
So are you guys saying my kernel should be supporting more than 4gb?
BTW, what the command
uname -a
gives (sorry about trivial thing and if this has been checked already)?
Valeri
++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++
uname -a is in the original message.
See to be a problem with the board
any memory I put in the black slots will fail with memtest..
damm
I was hoping if the pc booted up with about that annoying memory beep – I
was ok… I memtested and it failed
Bob Metelsky wrote:
I think, though I never saw the answer as to whether this is a 32-bit or
64-bit system.
mark
Bob Metelsky wrote:
Um. Do you have all the white slots filled? But if they’re filled, and the white and black are each matched pairs, then it doesn’t sound good for the m/b.
mark
Is this a PowerVault 770?
Accoding to http://www.dell.com/downloads/emea/products/pvaul/77XN.pdf It does support only 3GB of Ram. Can you please post a complete output of dmidecode. It may very well be a case where the on-board chipset is limited to 4GB address space minus the PCI addres space that leaves only
3 – 3.5GB ofg Ram space
its 64 bit – (first post)
actually this is a dell 9100 (desktop)
I had 2 pairs – 2gb each of ram different manufacturer actually I have 3 pairs of 2gb – any combination has the same results in memtest
1 pair in white
1 pair in black
boots without memory beep errors memtest fails badly on any test with 8gb bios sees the memory
I was running 2 2 gb originally now I have 4 1gb – so each slot is used and it tests perfect
Basically this is a lab setup for a 4 node hadoop cluster. This is the head node and needs the most ram – Id really like to get 8 but Ill live with 4
(if I have to)
So should my kernel support > 4gb? see below
Thank you all for your time!
~~~~~~~~~~~~~~~~~~~~~~~~~
details dime910 /home/robert # uname -a Linux dime910.hadoop.lab 2.6.32-431.23.3.el6.CentOS.plus.x86_64 #1 SMP Wed Jul 30 00:12:13 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Handle 0x1100, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_1
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 0820A113
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
Handle 0x1101, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_3
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 061D4B16
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
Handle 0x1102, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_2
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 061D4B12
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
Handle 0x1103, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_4
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 081FAF13
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
14 thoughts on - Yum Cant Find Kernel-pae
There isn’t a PAE kernel for x86_64. There isn’t a separate PAE kernel for i386/i686 anymore as with c6, PAE is an install requirement.
ok – good to know… so how can I get the computer to see teh 8 gb installed?
dime910 /etc/yum.repos.d # free -m
total used free shared buffers cached Mem: 3390 2415 974 0 169 1403
-/+ buffers/cache: 842 2548
Swap: 3998 0 3998
much appreciated
Bob Metelsky wrote:
Is this a 32-bit system? If not…
free -g
total used free shared buffers cached Mem: 1955 169 1786 0 0 153
-/+ buffers/cache: 14 1941
Swap: 7 0 7
mark “yes, that really is 2TB”
I cut out the text of dmidecode that weren’t necessary for the point:
I couldn’t find the Dell Service Manual for a ‘Dell 770’ but I was looking at the Service Manual for the Optiplex 760, and I saw that the way that the modules are paired isn’t obvious. It looks like you’ve got 2 2G memory modules from 64T256020EU2.5C2 (Kingston?) and 2 2GB
modules from CM2X2048-6400C5 (Corsair?). I suggest finding your service manual, and make sure that the modules are placed in the DIMM
slots and the same vendor RAM is paired with its partner.
It sounds to me like there might just be something weird going on with how the memory is installed. I’m assuming you don’t have an artificial limit in the kernel command line or anything obvious like that.
Jonathan Billings wrote:
Oh, Ghu…. I don’t know about lower-end desktops, but in servers, they
*MUST* be *identical*, even to the point of not being able to mix dual rank with quad rank, even if everything else is the same.
mark
Its dual channel and they are in the right spot, I reseated them
1 pair in black
1 pair in white
So are you guys saying my kernel should be supporting more than 4gb?
BTW, what the command
uname -a
gives (sorry about trivial thing and if this has been checked already)?
Valeri
++++++++++++++++++++++++++++++++++++++++
Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247
++++++++++++++++++++++++++++++++++++++++
uname -a is in the original message.
See to be a problem with the board
any memory I put in the black slots will fail with memtest..
damm
I was hoping if the pc booted up with about that annoying memory beep – I
was ok… I memtested and it failed
Bob Metelsky wrote:
I think, though I never saw the answer as to whether this is a 32-bit or
64-bit system.
mark
Bob Metelsky wrote:
Um. Do you have all the white slots filled? But if they’re filled, and the white and black are each matched pairs, then it doesn’t sound good for the m/b.
mark
Is this a PowerVault 770?
Accoding to http://www.dell.com/downloads/emea/products/pvaul/77XN.pdf It does support only 3GB of Ram. Can you please post a complete output of dmidecode. It may very well be a case where the on-board chipset is limited to 4GB address space minus the PCI addres space that leaves only
3 – 3.5GB ofg Ram space
its 64 bit – (first post)
actually this is a dell 9100 (desktop)
I had 2 pairs – 2gb each of ram different manufacturer actually I have 3 pairs of 2gb – any combination has the same results in memtest
1 pair in white
1 pair in black
boots without memory beep errors memtest fails badly on any test with 8gb bios sees the memory
I was running 2 2 gb originally now I have 4 1gb – so each slot is used and it tests perfect
Basically this is a lab setup for a 4 node hadoop cluster. This is the head node and needs the most ram – Id really like to get 8 but Ill live with 4
(if I have to)
So should my kernel support > 4gb? see below
Thank you all for your time!
~~~~~~~~~~~~~~~~~~~~~~~~~
details dime910 /home/robert # uname -a Linux dime910.hadoop.lab 2.6.32-431.23.3.el6.CentOS.plus.x86_64 #1 SMP Wed Jul 30 00:12:13 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dime910 /home/robert :( # dmidecode -t 17
# dmidecode 2.12
SMBIOS 2.3 present.
Handle 0x1100, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_1
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 0820A113
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
Handle 0x1101, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_3
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 061D4B16
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
Handle 0x1102, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_2
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 061D4B12
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
Handle 0x1103, DMI type 17, 27 bytes Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: DIMM_4
Bank Locator: Not Specified
Type: DDR
Type Detail: Synchronous
Speed: 667 MHz
Manufacturer: 7F7F7F7F7F510000
Serial Number: 081FAF13
Asset Tag: Not Specified
Part Number: 64T128020HU3SB
According to this:
ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_dimension_desktops/dimension-9100_owner%27s%20manual_en-us.pdf
…under “Specifications”:
Maximum memory: 4GB.
The el6 x86_64 kernel is capable of addressing 3TB (with a theoretical limit of 64TB) of RAM, according to this chart:
https://access.redhat.com/articles/rhel-limits
So, the limit is in your hardware, not the kernel you’re using.
Thanks for checking, Good chart, Ill save that. In that case, I can live with 4gb :)
I appreciate all your guys input and time, thank you!