Can I add memory to the Linux box without rebooting the system? I think Linux check the hardware at booting time. But if I need to add more memory to the server while I do not want to stop the service. Is there some method to make Linux use the new added memories?
View 5 RepliesI am running Debian Squeeze on an Intel DH55TC motherboard. When I issue a shutdown command
shutdown -h now
The system goes shutting down. Eveything looks fine, and the main console shows all process being stopped. In the end it says "System will now halt". Then a few seconds later, it restarts. It is unclear what is causing this, because nothing is written to the screen. It just goes blank and starts rebooting. Looking afterwards in syslog doesn't show anything also.
Why rebooting is not required in linux after installing an application even if related important files are running?
View 3 Replies View RelatedI have Debian (Kernel 2.6.26-2-686) installed on two computers. On one of them it reboots quite finely but I am having following problem with rebooting Debian on my second computer.When i type reboot at the linux prompt, following messages appear and system hangs up after saying "Restarting System":
The difference that I noted between my two computers is that I don't have ACPI support in the BIOS of the system which is giving me this error whereas the BIOS of my first computer do have ACPI support on which Debain do not give this Restart hanging problem.I have also disabled running the acpid script by running Code: update-rc.d -f acpid remove.
I have NFS fileserver that has served me well for more than year. But recently I noticed that it has started to reboot on its own very frequently, almost once a day! It is most likely not a power related issue as I tried changing UPS/power sources, but no help!So my question is:Is there any log file where I can check which is causing the reboot? There may not be a single logfile, but I need some point to start the investigation!
View 3 Replies View RelatedAs i read in google that if we Ctrl+Alt+Del in linux box system get rebooted i tried in my PC its not rebooting.
even though i un commented the line in /etc/inittab
ca::ctrlaltdel:/sbin/shutdown -t3 -r now
since upgrade to suse 11.3 every time I reboot pc the file /etc/hosts is reset to default value. I am a web developer so I need to put in there my aliases for 127.0.0.1. It is annoying to do it again and again. Luckily, I don't restart my system very often but still I would like to avoid that.What should I do to stop this resetting? Or is there another place in 11.3 where should I put my entries?
View 9 Replies View RelatedI have noticed that ubuntu 9.10 (but also other distro and in general those that configure the network automatically at startup) crashed if my pc boot directly with a linux kernel at power on.This does not happen if the first boot is done with windows xp and then rebooting the pc and choosing the same linux kernel.Some distro (for example SysrescueCD) that does not configure the network at startup can work but also with these if I try to configure the network using the command ifconfig eth0 the system crashes.My network card is a SiS191 Ethernet and linux recognized it using sis190 module.I suppose that something happen during the first power on, some inizialization done with windows xp but does not done with linux in fact after a reboot made from windows xp without shutdown the pc, with Linux I can configure the network using ifconfig without crash.
Any ideas to solve this without have to boot always windows as first?
I'm trying to come up with a startup init script that will check to see if the system was shut down gracefully, or if it is rebooting from a poweroff or something similar?Anyone know of a way to check for this condition with the least amount of room for false positives or vice versa?My intial thought is just a startup script that will will check for a file on startup, and on a proper reboot/shutdown just touch the file. But id like to avoid that type of script if possible,
View 2 Replies View RelatedI have installled ubuntu 9.04 and windows XP. After rebooting the system the desktop background image which i saved earlier is not showing up in Ubuntu.
View 1 Replies View RelatedI have a question regarding the /proc/interrupts file. Let's say for example I had a server with 2xQuad-Core processors (so we have CPU0 to CPU7 ), and with 5 network interfaces. SMP affinity to all 5 interfaces was set to "ff", so all interfaces have done interrupts on all the processors. he network interfaces interrupts counters should look like this:
24: 32650776 32670506 50315017 32677739 32672119 32677935 32656299 32667496 IO-APIC-fasteoi eth2
27: 35233448 35285546 35317201 52657622 35315835 35339998 35221092 35246597 IO-APIC-fasteoi eth3
55: 37573056 35870363 35874607 35858010 37728061 35880275 35882340 35882127 PCI-MSI-edge eth1
56: 35861392 35863516 35865123 35865342 35864604 40515822 35861250 35863585 PCI-MSI-edge eth0
58: 30173318 30109146 30002990 30016870 30084937 30034759 46517278 30139103 PCI-MSI-edge eth4
Now let's say I've set the affinity to each of the network interfaces, so that it balances one per processor, so we have 5 processors working only for the network interfaces each processor with it's own eth. Now let's assume that the network interfaces generate very few interrupts, and that they show up every 5-6 seconds, so watching cat /proc/interrupts doesn't exactly underline the modifications unless you look with a ruler. Is there a way to reset the counters on /proc/interrupts so that they all start at 0, without rebooting the system?
How to update newly created partion in RHEL6 without rebooting the system?partprobe /dev/sdaN...does not work here in RHEL6, however it did work in RHEL 5.
View 2 Replies View RelatedI'm using Gnome and I'd like to still have the ability to reboot/shutdown from one particular account as well as root. How would I modify the chmod command to add this ability?Also, I have a few users who just will hold the power button in to shutdown the machine. How can I keep them from doing this?// Pruned from the vintage 2007 Prevent a non-root user from shutting down, rebooting or suspend the system thread. Please create new threads instead of resurrecting ancient ones.
View 2 Replies View RelatedIs there a system admin tool for RHEL on montioring and logging system memory used and released that can dump to a log file?I'm having an issue with memory not being released when an application is closed. I need to have a tool monitor and log so I can troubleshoot to verify that it's an application not the OS.
View 2 Replies View RelatedI have Mythbuntu 10.04 installed on an exclusive HTPC and working great... until tonight. After letting the system update some packages (161 packages if I remember right), I suddenly have an issue where the graphical system won't start. After researching I found three error messages that might be causing that.
1. At the start of splash screen I see "UUID=xxxxxxxCD7 not ready yet or not present" I checked in /etc/fstab and found that this is the swap partition. I don't remember seeing this before so this could be the culprit.
2. I'm not at the computer in question right now but I saw a Plymouth error about "mountall" and then the message "plymouth command failed". Not sure if this could be the main error.
3. after a while (usually ca. 1-2 min) I receive thousands of errors of the kind "out of memory"... "kill process XXXX" (process vary wildly e.g. dbus-daemon, mysql, etc)... "process killed"..."respawning"
After error 3, I'm not able to switch to graphical console (ctrl-alt-F7). If I was in the graphical console at this moment, I simply can't switch to the CLI console. I'm always afraid of updating my system since I've seen lots of things breaking afterwards (usually the proprietary graphic drivers) but this is really strange.
I need a Linux distribution which has got drivers for pendrives and could play the music.
What version could you recommend for me?
I just installed Fedora 13 onto a "new" (to me) box, and everything seems mostly fine, except that I only seem to be able to use about 900.2 MiB of 991.4 MiB of RAM memory, according to System Monitor. I haven't set up a swap partition yet, so the problem became very, very, very obvious. When I get to about 890 MiB usage, everything goes very quickly downhill, locking up, etc. The peak I saw was 900.2 MiB. What's going on? Does this have anything to do with the system being 64-bit? Might the memory be bad?
View 14 Replies View RelatedI have a new lenovo thinkserver hardware. I was configuring my newly installed kernel (slackware 13.1 - kernel 2.6.33.4) maybe to weeks now. I was testing the configuration of the kernel parameters.Suddenly out of the blue my BIOS started to report memory error. I have 6 Fully buffered memories in pairs. Four has no advanced ECC and two supports ECC.It is possible to damage the memory by some wrong kernel configuration???I cannot believe that this is possible but I cannot see any other explanation how can a two weeks old hardware get wrong.
View 6 Replies View RelatedI have 4G memory, but linux can only detect 3.5G. The graphics card is a 128M one, even if this is shared there should still be more than 3.5G memory.
What is the problem in here? code...
I use a Debian Squeeze system running off a flash drive, i.e. based on a custom Live image running in persistent mode. It runs great and I am grateful for the existence of Debian . However, I have a question. A lot of the machines I use this pen drive on are quite old, often with 512 MB RAM and old processors. I specifically built my system using XFCE and lightweight apps off an initial live image using the standard-x11 package list (basically just Xorg with drivers and the base system). At first things ran very well, blazing fast even on the oldest systems and could comfortably run Firefox along with LibreOffice side by side (I need LO as all of my colleagues use Word docs, often with track changes, which Abiword can't handle properly). However, over time, I've found that memory usage has risen, tot he point where Firefox is now automatically killed on the older systems every time I start LibreOffice.how does one figure out why memory usage is going up? I've checked for inessential services and turned them off with "insserv -r". I've used only lightweight apps, as mentioned before. Are there other general tips on reducing memory usage?
View 4 Replies View RelatedI have a server running samba process and there are about 70 samba users connected at a time. The system has 4Gb of memory and it seems each samba process is utilizing only 3352Kb of memory.
When I run the command
pmap -d (pid of samba)
It gives as:
b7ffa000 4 rw-s- 0000000000000000 0fd:00003 messages.tdb
bfe46000 1768 rw--- 00000000bfe46000 000:00000 [ stack ]
ffffe000 4 r-x-- 0000000000000000 000:00000 [ anon ]
mapped: 33384K writeable/private: 3352K shared: 20504K
But when I run the top command, it results as below:
Tasks: 163 total, 1 running, 162 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.9% us, 4.9% sy, 0.0% ni, 93.3% id, 0.8% wa, 0.2% hi, 0.0% si
Mem: 3895444k total, 3163192k used, 732252k free, 352344k buffers
Swap: 2097144k total, 208k used, 2096936k free, 2487636k cached
Why could the system be utilizing such high memory? By the way, the server is not running other processes. The samba version running in it is 3.0.33-0.17.
I have worked in linux for a long time but never managed the system until I got my own server, which is running Fedora 14. I have a 3 TB Drive and apparently can only handle 2 TB. At least the Disk Analyzer is telling me that 2TB is 100% max capacity. Also viewing disk analyzer, I am only using 50GB of my 2TB but I am out of memory in the Root file system. If I run df -h, I get he following:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_dev1-lv_root
50G 40G 7.2G 85% /
[code]....
How can i get the RAM Memory on system in terminal when i have 3 GB with an output like this:
3072
or
3145728
[code]....
Ubuntu 10.10
How do I clear the System cache memory.
For the past few days , I am facing problem in opening websites (firefox & Chrome).
I have to restart the laptop and then access the web sites.
Is there something similar to the windows TSR thing in Linux? (terminate & stay resident)
The reason I ask is that after replacing my HD and reinstalling Maverick I've noticed the PC freezing up afew times. It seems that memory gets used up and then doesnt free up after the application is closed. The last couple of times this happened today I was doing
1. Copying a number of photos from my flash drive to the HD
2. Burnt a disk with Brasero.
After doing this it froze and I had to crash the system and reboot. I don't remeber this happening before.
Apart from this memory problem it's working OK I think. My system specs are below
Code:
mbdb@M2000:~$ sudo lshw
m2000
description: Notebook
product: Presario M2000 (EK823EA#ABU)
vendor: Hewlett-Packard
[Code].....
The more context the better. So far it does not look like it has anything to do with memory.
View 4 Replies View RelatedI'm aware of Linux ECC project, but how to detect ECC errors/warnings under Linux? Do I need to load additional modules in order to get this information?
View 2 Replies View RelatedIn system monitor, there are numerous processes. Some such as metacity and nautilus are using 12-21 mb memory. Since my server is a 512 mb computer, which services or processes can I safely remove or end ?
View 14 Replies View RelatedI have set swappiness to 0:
# sysctl vm.swappiness
vm.swappiness = 0
According to various sources, this should mean that applications have priority over file chaches, and swap should only be used when the applications themselves need more memory than is physically available. So I naively took the value free provides in the '-/+ buffers/cache' line as 'free' as the amount of memory to be available on the server. Unfortunately this is not even close to true: On a server with 20GB RAM, memory utilization by this measure never reached 50%, yet the system swaps.
I then figured out that I could use 'sync; echo 3 > /proc/sys/vm/drop_caches' to drop cached stuff. I was very surprised to still have 12.5 GB cached data after doing that. I am figuring that it's those 12.5 GB which force the system to start swapping. I also tried to use /proc/meminfo to figure out how that cached memory is used (by comparing its content before and after dropping caches). However, I don't see the correlation between the numbers provided there and what part of the cache can be dropped.
The closest match seems to be the 'Mapped' line, which was 10GB. I am pretty sure that being mmapped keeps the kernel from dropping cache. However, the value is 2.5 GB less than the cache which can't be dropped. So it is not the whole answer. What I am looking for is some way to determine how much memory the kernel could provide by dropping stuff if he needs to because of memory pressure. Is there maybe a way to simulate drop_caches without actually doing so?
The amount of potentially available memory does not have to be scientifically correct, but the number should at least be always in the right ballpark, which right now, it ain't... The point here is that it's a productive system. Sy doing stuff like dropping caches or filling memory until the system starts to swap is not a permanent solution to figure out the value. By the way, it turned out that postgres was the culprit in this concrete case, stopping it made dropping all caches possible, but that does not answer the general question of how to estimate available memory...
1. Is my assumption correct that I can subtract 'Mapped' from the freeable cache memory completely?
2. Where could the other 2.5 GB be used?
3. Is there a way to get a better guess of how much memory the system can free if necessary, before swap has to be used?
I need to allocate a % of the total system memory for a buffer but what is the best method to determine how much memory is in the system? So far the only way I have found is to get the pages of memory:
Code:
long sysconf(_SC_PHYS_PAGES)
Is that the only option?