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Only half my 64G memory can be used in Ubuntu

Usable ram is half of total memory4GB out of 8GB total reserved 64bit 12.04 whyCan't find where memory is being usedUbuntu system Does not see ram16.04LTS 64bit sees only 3.5GB of memory out of 8GB16.04LTS 64bit sees only 3.9GB of memory out of 8GBX370: Only half of my memory is availableimageJ change memory used18.04 Server USB 3.0 and eSataUbuntu(16.04.5) Memory is used more than 97%. Why it is used so much memory?

I just bought a second-hand server(Dell R410), which has 64GB(8 x 8GB) Memory.

After I formatted all the system, and installed Ubuntu 18.04 Server Version (64bit). Only 24GB have been listed in system and can be used.

//free -mh

              total      used

Mem:            23G      7.7G   

Swap:          8.0G      1.8G

However, all the 8 memories are recognized by the system, and here is the info from dmidecode | grep -A16 "Memory Device$"

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2CA0A8E2

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A70C01A

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8D7

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A20C022

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 5

Locator: DIMM_B1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 32B17837

Asset Tag: 0110121D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8E0

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2270025F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 4

Locator: DIMM_B4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 15C1C42F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9

What can I do to use all the 64GB memory instead of 24GB? Is Ubuntu 18.08 support more than 64GB memory?

edited Dec 22 '18 at 6:48

asked Dec 20 '18 at 19:36

ppn029012

1062

1

Can you try and remove the RAM modules, maybe clean the sockets with compressed air and put the modules back in? You can also try swapping them around so that they're in a different order. I am not sure why, but this has reportedly solved problems like yours numerous times already.

– Byte Commander
Dec 20 '18 at 19:41

@user535733 The release is Ubuntu 18.04.1

– ppn029012
Dec 22 '18 at 6:48

1

max memory for Linux is shown with sudo apt-get install dmidecode and then sudo dmidecode -t 16

– Rinzwind
Dec 22 '18 at 7:05

add a comment |

I just bought a second-hand server(Dell R410), which has 64GB(8 x 8GB) Memory.

After I formatted all the system, and installed Ubuntu 18.04 Server Version (64bit). Only 24GB have been listed in system and can be used.

//free -mh

              total      used

Mem:            23G      7.7G   

Swap:          8.0G      1.8G

However, all the 8 memories are recognized by the system, and here is the info from dmidecode | grep -A16 "Memory Device$"

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2CA0A8E2

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A70C01A

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8D7

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A20C022

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 5

Locator: DIMM_B1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 32B17837

Asset Tag: 0110121D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8E0

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2270025F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 4

Locator: DIMM_B4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 15C1C42F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9

What can I do to use all the 64GB memory instead of 24GB? Is Ubuntu 18.08 support more than 64GB memory?

edited Dec 22 '18 at 6:48

asked Dec 20 '18 at 19:36

ppn029012

1062

1

Can you try and remove the RAM modules, maybe clean the sockets with compressed air and put the modules back in? You can also try swapping them around so that they're in a different order. I am not sure why, but this has reportedly solved problems like yours numerous times already.

– Byte Commander
Dec 20 '18 at 19:41

@user535733 The release is Ubuntu 18.04.1

– ppn029012
Dec 22 '18 at 6:48

1

max memory for Linux is shown with sudo apt-get install dmidecode and then sudo dmidecode -t 16

– Rinzwind
Dec 22 '18 at 7:05

add a comment |

I just bought a second-hand server(Dell R410), which has 64GB(8 x 8GB) Memory.

After I formatted all the system, and installed Ubuntu 18.04 Server Version (64bit). Only 24GB have been listed in system and can be used.

//free -mh

              total      used

Mem:            23G      7.7G   

Swap:          8.0G      1.8G

However, all the 8 memories are recognized by the system, and here is the info from dmidecode | grep -A16 "Memory Device$"

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2CA0A8E2

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A70C01A

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8D7

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A20C022

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 5

Locator: DIMM_B1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 32B17837

Asset Tag: 0110121D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8E0

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2270025F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 4

Locator: DIMM_B4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 15C1C42F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9

What can I do to use all the 64GB memory instead of 24GB? Is Ubuntu 18.08 support more than 64GB memory?

edited Dec 22 '18 at 6:48

asked Dec 20 '18 at 19:36

ppn029012

1062

I just bought a second-hand server(Dell R410), which has 64GB(8 x 8GB) Memory.

After I formatted all the system, and installed Ubuntu 18.04 Server Version (64bit). Only 24GB have been listed in system and can be used.

//free -mh

              total      used

Mem:            23G      7.7G   

Swap:          8.0G      1.8G

However, all the 8 memories are recognized by the system, and here is the info from dmidecode | grep -A16 "Memory Device$"

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2CA0A8E2

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 1

Locator: DIMM_A2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A70C01A

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8D7

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 2

Locator: DIMM_A4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2A20C022

Asset Tag: 0109401D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 5

Locator: DIMM_B1 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 32B17837

Asset Tag: 0110121D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B2 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD00B380AD

Serial Number: 2C40A8E0

Asset Tag: 01102461

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 6

Locator: DIMM_B3 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 2270025F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9  

--

Memory Device

Array Handle: 0x1000

Error Information Handle: Not Provided

Total Width: 72 bits

Data Width: 64 bits

Size: 8192 MB

Form Factor: DIMM

Set: 4

Locator: DIMM_B4 

Bank Locator: Not Specified

Type: DDR3

Type Detail: Synchronous Registered (Buffered)

Speed: 1333 MT/s

Manufacturer: 00AD009780AD

Serial Number: 15C1C42F

Asset Tag: 0109391D

Part Number: HMT31GR7AFR4C-H9

What can I do to use all the 64GB memory instead of 24GB? Is Ubuntu 18.08 support more than 64GB memory?

18.04 ram

edited Dec 22 '18 at 6:48

asked Dec 20 '18 at 19:36

ppn029012

1062

edited Dec 22 '18 at 6:48

asked Dec 20 '18 at 19:36

ppn029012

1062

edited Dec 22 '18 at 6:48

asked Dec 20 '18 at 19:36

ppn029012

1062

asked Dec 20 '18 at 19:36

ppn029012

1062

asked Dec 20 '18 at 19:36

ppn029012

1062

1

Can you try and remove the RAM modules, maybe clean the sockets with compressed air and put the modules back in? You can also try swapping them around so that they're in a different order. I am not sure why, but this has reportedly solved problems like yours numerous times already.

– Byte Commander
Dec 20 '18 at 19:41

@user535733 The release is Ubuntu 18.04.1

– ppn029012
Dec 22 '18 at 6:48

1

max memory for Linux is shown with sudo apt-get install dmidecode and then sudo dmidecode -t 16

– Rinzwind
Dec 22 '18 at 7:05

add a comment |

1

Can you try and remove the RAM modules, maybe clean the sockets with compressed air and put the modules back in? You can also try swapping them around so that they're in a different order. I am not sure why, but this has reportedly solved problems like yours numerous times already.

– Byte Commander
Dec 20 '18 at 19:41

@user535733 The release is Ubuntu 18.04.1

– ppn029012
Dec 22 '18 at 6:48

1

max memory for Linux is shown with sudo apt-get install dmidecode and then sudo dmidecode -t 16

– Rinzwind
Dec 22 '18 at 7:05

Can you try and remove the RAM modules, maybe clean the sockets with compressed air and put the modules back in? You can also try swapping them around so that they're in a different order. I am not sure why, but this has reportedly solved problems like yours numerous times already.

– Byte Commander
Dec 20 '18 at 19:41

@user535733 The release is Ubuntu 18.04.1

– ppn029012
Dec 22 '18 at 6:48

max memory for Linux is shown with sudo apt-get install dmidecode and then sudo dmidecode -t 16

– Rinzwind
Dec 22 '18 at 7:05

add a comment |

1 Answer
1

active

oldest

votes

It works after I clean the memories slot. It might be caused by the bad contact of hardwares.

answered 5 hours ago

ppn029012

1062

add a comment |

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It works after I clean the memories slot. It might be caused by the bad contact of hardwares.

answered 5 hours ago

ppn029012

1062

add a comment |

It works after I clean the memories slot. It might be caused by the bad contact of hardwares.

answered 5 hours ago

ppn029012

1062

add a comment |

It works after I clean the memories slot. It might be caused by the bad contact of hardwares.

answered 5 hours ago

ppn029012

1062

It works after I clean the memories slot. It might be caused by the bad contact of hardwares.

answered 5 hours ago

ppn029012

1062

answered 5 hours ago

ppn029012

1062

answered 5 hours ago

ppn029012

1062

answered 5 hours ago

ppn029012

1062

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