Synonym for: RAM - Acronym for: Random Access Memory, a type of computer data storage.

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Where can one find good documentation describing memory-rank “sparing”?

Where can I find good documentation describing memory-rank "sparing" (for computer-hardware memory-protection configurations)? I'm seeking to clarify what benefits it provides and how it's typically ...
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2answers
2k views

What does “single-bit ECC errors were detected on the RAID controller” mean?

I have a Dell T7600 with a Perc H710P RAID controller and 4 attached 3TB drives. Over the past few months the RAID controller has been intermittently reporting errors on boot: "no boot device found", ...
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4answers
236 views

Why is it so hard to get servers with Lot of Ram, but few cores?

SQL server has a very high per core license cost, but for a lot of workloads benefits more from lots of RAM. his is now even more of the case with in-memory tables. Even if a server with 4 cores ...
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1answer
488 views

Fastest server ram configuration for 48GB?

I have an HP ProLiant DL160G6 server, with 2 CPU's and 48GB ram, with following modules: 4x 8GB Module - DDR3 1066MHz (KTH-PL310Q8/8G) 4x 4GB Module - DDR3 1333MHz (KTH-PL3138/4G) I'm re-purposing ...
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492 views

Mysterious memory usage in Linux

We have some 64 bits Linux boxes (RHEL6) running on Microsoft Windows 2012 Server (Hypervisor) with the same problem. Those Linux guest servers are running in MS Windows Cloud (Hyper-V) with 16 hosts ...
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644 views

Mysql running out of memory

I am having a lot of trouble with mysql eating too much ram on a small machine and am looking for some help in figuring out why it is eating so much. I have a small virtual machine with 256MB of RAM ...
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700 views

msmdsrv.exe is taking 1.5 GB of memory? [closed]

I have a windows server and this server has 4 GB of memory. But the msmdsrv.exe is taking 1.5 GB of memory. What is that, and why is it doing this? How can I make it stop? This is a production ...
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50 views

What is the ideal strategy for RAM consumption between applications deployed in same tomcat 7 container or in different tomcat 7 instances

I have been thinking about how to manage RAM between different 3 java webapps. I have blurred concepts in mind. Deploy all the web apps in the same tomcat7 instance or have 3 different instances of ...
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2answers
258 views

Which type of RAM we should use? Registered or Unregistered?

We are planning to buy two different servers from HP. They will be used in project where we do lot of statistical analysis and Java development/testing etc. Servers are : a) Part :ML350e 2403 CTO ...
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216 views

289 dimm pair 2 failed memory test [closed]

In my IBM System eServer x336 , when I boot up, the red LED lit up, and it shows this: 289 DIMM Pair 2 failed memory test DIMM 05 is affected DIMM 06 is affected Not very sure what I am supposed to ...
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387 views

Why wont my Dell server use IBM ram?

I stumbled upon four pieces of 4GB PC2 5300F RAM from IBM (Part Number 43X5061). In my Dell Poweredge 1950 Rev 2 server there currently are two 512MB sticks, which appear to have the same ...
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502 views

When does Linux run out of memory? [duplicate]

I'm trying to establish why a process keeps unexpectedly stopping, and one possibility is that the server is running out of memory, but I'm not sure I understand memory and Linux properly. Take the ...
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2answers
178 views

Centos 6 webserver - best use of spare memory [closed]

Just after any quick easy suggestions about where I should try tweaking my web server to use some of the spare memory and reduce CPU usage. Sorry if I'm a bit vague, but this isn't really my area. I ...
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1answer
47 views

Total memory consumption in linux machine

i have a question of mem RAM cosumition. The question is that "htop" show me 6GB or RAM used of 32Gb but i can´t find which process are consuming this amount of memory. if i run ps -e -orss=,args= ...
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2k views

MySQL (MariaDB) crashes frequently

I recently migrated an old server running MySQL to a new VPS running MariaDB 5.5. I don't have too much running on the server (just a few PHP sites) and free memory seems to be OK, but the DB keeps ...
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How do I get my memory channel(Single channel, Dual channel, etc) type in Linux?

I want to know what type of my memory channel in Linux, Single or Dual or etc.. 1.I try find it by check /proc filesystem, but didn't success. And then 2.I use `dmidecode` to get system informations, ...
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1k views

Worker MPM or Prefork? [closed]

I understand that there is a comparison topic between the two modules here but this is different. I was contacting cPanel support in order to help me freeing up some memory usage on the VPS. They ...
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1answer
547 views

Linux empty buffer cache command permission denied

I'm using the following commands to flush cache: # sync; echo 3 > /proc/sys/vm/drop_caches # sync; echo 2 > /proc/sys/vm/drop_caches # sync; echo 1 > /proc/sys/vm/drop_caches When I use ...
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3k views

CPU/RAM upgrade for HP Proliant ML350 G5

I have an HP ML350 G5 server with a single Intel 5130 dual core Xeon installed. Is it possible to upgrade it to a dual processor system? I've looked at the quickspecs and spent a couple of hours ...
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65 views

How to use kexec to do a live upgrade of hotswap ram on a CentOS vm image?

Just as the question states, is there a way and what's the best method todo a live ram upgrade with kexec?
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1answer
3k views

How do I reserve RAM on the Hyper-V 2012 host partition for VMs only?

I have a situation where a Hyper-V 2012 cluster node cannot support 2 VMs when I think it should. Presently, I'm playing around with 96GB RAM, and I want to have 2 47GB VMs running (static RAM). That ...
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304 views

What does TOP's DATA column mean?

I'm trying to figure out the meanings of all the different classifications of memory such as VIRT, RES, SHR, AND DATA. While I generally understand the first 3, I have no idea what the DATA column ...
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662 views

MySQL memory usage - Periodically need to run FLUSH TABLES or memory usage keeps growing with large-pages turned on

After switching our rather memory + physical core rich database server to large-pages, we have noticed a small issue. The memory usage almost looks like there is some sort of memory leak. But ...
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4k views

Unusually high dentry cache usage

Problem A CentOS machine with kernel 2.6.32 and 128 GB physical RAM ran into trouble a few days ago. The responsible system administrator tells me that the PHP-FPM application was not responding to ...
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IBM Server sees half of the original RAM

We have a IBM XSeries 206M server. There are 2 2GB IBM RAM's which are suitable with the server. Normally we expect that server should see 4GB of RAM. But It works with 2 GB only. So we thought that ...
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192 views

Our RAM usage is high, including -/+ buffer/cache, but top has no answers

We are running CentOS 6 with a PHP web application. After we pushed a new version live it seems we have a memory issue, however top does not show any high usage instances. I have looked around and ...
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106 views

Determining Correct Memory For ProLiant ML115

I'm upgrading the memory on a HP ProLiant ML115 server for a client so I went out onsite today to figure out what kind of memory he needed. I figured I would make note of the model number and look up ...
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261 views

Why can't I malloc as much memory as `free` reports as being free?

The following C program allocates slices of 10MB of memory until it is killed by the Out of Memory killer. #include <stdio.h> #include <stdlib.h> #include <string.h> #include ...
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169 views

How can used physical memory exceed sum of 'resident' memory reported by processes?

Given the output of top shown below (which shows all processes currently active): how is it possible that this virtual server reports ~500M physical memory as used (used - cached, verified by free), ...
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564 views

MySQL crash when I increase max_heap_table_size value

I have a MySQL instance running on an Ubuntu 12.04 server, equipped with 120 GB RAM. There are several PHP scripts running on it, which sometimes set new mysql parameters. One of these scripts uses ...
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699 views

How can free physical memory decrease while 'Res' memory used by processes is constant?

I observe the following behavior that I cannot explain: the amount of free physical memory reported by a server increases, while the 'Res' memory reported by the most memory-hungry processes (web ...
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144 views

Are there any disadvantages to unusual RAM amounts for virtual machines?

This is going to seem like a silly question, but many many years ago I somehow got it into my head, perhaps from reading an article or speaking to people 'in the know' that a computer should not be ...
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3k views

Why does my SQL Server use AWE memory? and why is this not visible in RAMMap?

We have a Windows Server 2008 R2 (64-bit) 8GB server where, according to Sysinternals RAMMap, 2GB of memory is allocated using AWE. As far as I understood, this means that these pages stay in ...
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1k views

IIS Memory management & thresholds with potential leaks

We're running some X64 Win Server 2012 webservers (So IIS 8). We're noticing that the free memory on the boxes is constantly sitting at 5-10% free. We actually run quite a lot of applications on ...
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70 views

Exchange store.exe memory spiking bewteen midnight and 6AM

I have a windows server 2003 R2 64bits SP2 with Exchange Server 2007 installed. The server has 12GB of ram and during the night, always between 12PM and 6AM, the memory usage spikes to 100% with ...
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Red Hat Enterprise Linux 4 - free -m shows high memory used in second line but no process actually uses memory

I have a Red Hat Enterprise Linux. I understand that top can show high memory usage, which is fine. free -m shows below output: $ free -m total used free shared ...
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476 views

How can I use huge pages and libhugetlbfs on a Debian EC2 PVM instance?

On my local machine (i7 9200) running Debian Wheezy amd64 I can get some significant speedups on some "big data"/HPC type stuff by: Following the instructions here to reserve some RAM for huge pages ...
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502 views

High Memory 64bit server, not using all ram

I have several high memory linux servers running centos 64bit, and after 10-20 days of uptime I have noticed on all of these servers they dont actually use all the ram available to then (they all have ...
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305 views

Linux Kernel lowmem usage

I am debugging an issue where we are running out of kernel low memory and I am trying to identify who is using the kernel low memory thats contributing to the problem. Following is the meminfo ...
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345 views

What are Linux shared memory 'segments' vs. 'pages'?

The Linux kernel docs say: shmall: This parameter sets the total amount of shared memory pages that can be used system wide. Hence, SHMALL should always be at least ...
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109 views

Trading Engine running on RHEL 5.x [closed]

Before asking question quick background about myself working at one of trading company this is my 1st job as sysadmin I have finish my RHCE no experience how production server work. In our company ...
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274 views

Why the system information message when accessing an Ubuntu server doesn't match free -m?

Each time I SSH into my AWS Ubuntu servers I see a system information message, showing load, memory usage and packages available to install, like this: Welcome to Ubuntu 12.04.3 LTS (GNU/Linux ...
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150 views

Transfer used ram to swap and free more physical ram

I have a vps with 256m physical ram and 512m swap space, I am trying to use a software that need more than 256m and less than 512m ram, so it uses swap. The problem is at some moment of the ...
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1answer
2k views

How much free memory should I have on my webserver? [duplicate]

I have a webserver that's currently hosting two Wordpress sites and some java-based collaboration software. The server has 2G of memory and is currently using about 1.8G of the available memory. ...
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1answer
150 views

Drop caches in Linux

I have an embedded Geode-based application server with 512MB RAM and I'm about to try to maximize free memory during applications workload, which uses MySQL database 5.5 with InnoDB quite ...
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How to find what is using linux swap or what is in the swap?

I have virtual linux (Fedora 17) server with 28GB RAM and 2GB swap. The server is running mysql db that is set up to use most of the RAM. After some time running the server starts to use swap to swap ...
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70 views

How Do I Know the Memory Used by Apps [closed]

Is it possible to know the memory used by any apps running on my linux server? I'm using the following command to know how much memory used by php-fpm. ps -ylC php5-fpm --sort:rss | awk '!/RSS/ { ...
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369 views

What is the difference between memtest86 and memtester?

Memtest86+ - http://www.memtest.org Memtester - http://pyropus.ca/software/memtester/ I am looking at above memory test tools. What is the difference between these two? (In what aspect should it ...
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90 views

What amount of physical RAM would a typical “commodity class” server have, as of late 2013? [closed]

I'm trying to spec out servers for my company's infrastructure group to build. They tell me anything more than 2GB is too much, which I find ridiculous considering cheap DRAM is about 15 bucks a dimm ...
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1answer
2k views

Why am I missing 4GB of RAM on Windows Server 2008 R2 64bit?

I noticed today that a server was very low on memory. It physically has 8GB installed and runs Windows 2008 R2 Standard 64bit. It also hosts 2 virtual machines using HyperV. Server is Dell ...