General :: How To Find The /dev/Device Mapping For NFS File System In RHEL
Jun 19, 2010
Found the below from RedHat Knowledgebase
The Completely Fair Queuing (cfq) scheduler in Red Hat Enterprise Linux 5appears to have worse I/O read performance than in version 4. It appears as though the Completely Fair Queuing I/O scheduler (cfq) has a regression and thus exhibits reduced read-side throughput which can affect performance for both local and NFS mounted file systems.
One way to mitigate this is to set the cfq's slice_idle parameter to zero. To change this value, execute the following command echo 0 > slice_idle in the /sys/block directory appropriate for your situation, as shown below:
echo 0 > /sys/block/hda/queue/iosched/slice_idle
We are using NFS file systems in RHEL 5.3. I would like to know how to find which /dev/Device is being used by the NFS file systems, so that I could try setting the slice_idle to '0' to see if there is any difference in performance? In /etc/fstab I only see the actual NAS volumes for the NFS file systems.
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Aug 23, 2011
I've bought an X10 Home Automation USB interface: the CM15.
This is the information lsusb gives:
skerit@KIP-DU-SKER:~$ lsusb Bus 008 Device 002: ID 0bc7:0001 X10 Wireless Technology, Inc. ActiveHome (ACPI-compliant)
But this tells me nothing about where the device file is! How can I find that, or create one myself?
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Apr 5, 2010
How to setup Dynamic Multipathing in RHEL5 and mapping a device to it? I have a RHEL5 server which is connected with a HP BLADE Server. I have installed DM software. Now I want to map BLADE Server's LUN space with a directory of my RHEL5 Server.
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Aug 14, 2010
where I can to find mapping between man section number and it's description in standalone mashine.In other words, where I can to find description of some man section when I have not connection to Internet? For example:
1 -> User commands
2, 3 -> Linux programmer's manual
and so on..
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Sep 21, 2011
How to find file by content on linux by command. Example: i want find file contain word "helo" on my computer (OS: LINUX)
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May 6, 2011
i've just installed RHEL 6 with twm.i want to use mplayer but it can't open/initialize audio device. On the redhat homepage they said soundcard is auto-config'ed. i have 2 soundcards here buti compiled mplayer from source but it's the same.
Code:
mplayer -ao help RET
Available audio output drivers:
[code]....
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Apr 23, 2010
How to find continuously growing files in the file system?
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Dec 29, 2010
We have recently built some RAC (OS:RHEL55) servers and after the Oracle guys have installed their application, somehow the directory / is using the maximum space. I contacted the Oracle team & they say that their RAC installation doesn't create any files in the / directory. This is the o/p of '/' directory file system:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/datavg-vol2 498M 382M 62M 88% /
Also, when I checked the file sizes, I found that the following files were taking more space:
/etc/selinux/targeted/modules/active/
-rw------ 1 root root 17M Nov1 base.linked
[code].....
I don't know what these files are doing there, when I did a cat and cheked, I found the files containing this data:
nf_tre--
stem_dbusd_var_run_t...and some stuff like this Unable to decide whether or not to remove these files. Also, is there any way to find out what files are taking more space and whether they can be deleted or not? in order to free up some space in the / direcoty. As there are 10 RACs that we've build, I got to do something to fix this for all of the 10 servers.
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Aug 28, 2010
Is there some file in Linux that enumerates and describes mount options for file systems like /etc/services describes ports?
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Jan 12, 2010
I need commands which five me the following details abt all the file systems mounted the linux box
type
mount pt
file system id
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Jul 13, 2011
I'm new to this and I'm sure I've just gone and done something silly. I used pendrivelinux.com's live usb creator to install ubantu 11.04 on my USB. I tried booting my laptop with this, and i get an error message saying "unable to find a medium containing live file system" and I cant get any further than that. The laptop I am using is a Dell XPS with an i7 processor and 6 gigs of memory.
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Sep 7, 2010
My shell script is calculating the count of each shortcode series wise whose sample output is as follows:
Code:
56882
9124 1
9172 1
9173 4
[code]....
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Apr 20, 2011
Is 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.
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Jun 4, 2010
How to find, what are the files (system & user) created after login to the system in RHEL 5.0?
Any single command available?
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Jan 14, 2011
Do you know where I can find rhel 5.2 iso?
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Dec 1, 2009
I had been trying to install Ubuntu 9.10 after formatting my machine. When i select install of the welcome screen, the logo blinks for few minutes and then displays a error as
Code:
Unable to find medium with live File System
Then goes to busy box.
"The same thing appears with Ubuntu 8.10, which i was using before!"
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Mar 17, 2011
I just compiled my first own kernel (I'm using Arch Linux), following the tutorial on the german site. Now I tried to boot it, I ended up failing with this message: Code: Waiting 10 seconds for device /dev/sda1 ... Root device '/dev/sda1' doesn't exist, Attempting to create it. ERROR: Unable to determine major/minor number of root device '/dev/sda1' Here is the important part of my menu.lst:
[Code]....
I simply copy&pasted the Arch-entry, i.e. I also had the disk by uuid there. The failure message was the same, just the root device name was the different name Also, at first I did not have the initrd line in my menu.lst (as written in my tutorial that I may not need it). In this case I had this error message:
[Code]....
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Jul 6, 2010
Where can I find the documentation for RHEL 5.4 kernel 2.6.18?
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Apr 14, 2011
find out the primary interface on RHEL Linux. I came across [URL]. Is this the best way?
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Oct 22, 2010
me know how to find expired account in linux. I am using RHEL 4.0
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Feb 27, 2010
Where I can find a legitimate 3rd party repository that provides rpm packages for RHEL 5? My trial subscription to the Red Hat Network has expired and I want to be able to test installing packages so that I can prepare for the RHCT examination.
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Sep 14, 2009
I have Red Hat Enterprise 5 and am trying to resize a partition. I am using the resize command within "parted" and am getting the following error - Error: File system has an incompatible feature enabled.
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May 16, 2010
During the installation of RHEL it asks that you may enter the installation number to get packages , updates .....etc, now my server is up and running and i need to get the number that I added during installation
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Mar 2, 2011
is possible to edited the default RHEL CD to have it automatically install RHEL based off of a kickstart file that I will store locally on the CD. My plan would be to put a cd in a server and have the OS automatically being installed.
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Mar 17, 2011
So I wanted to copy a copy-prod disk and decided to try dd after reading some information about it. after running dd for about a minute, I got a warning that I was low on disk space. I stopped dd and found I had only 200 MB left of 200 GB free space (originally having over 220 free). I deleted the 1/2 finished backups but cannot find the data which was written to the drive. It is hard to think that that much data could be written with my slow pc in under one minute.here are the commands I performed if that helps locate the data:
dd if=/dev/cdrom of=/mnt/disk/home/mark/pccheck.iso
dd if=/dev/cdrom of=/home/pccheck.iso
sudo dd if=/dev/cdrom of=/home/pccheck2.iso
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Apr 13, 2011
I'm Pab, just like to know, How can I allow a new user to run specific software like sqlplus.
Scenario:
I have an oradb@database user where i can execute sqlplus /nolog command, but when i created a new user named allan@database the bash says....-bash:sqlplus: command not found.
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May 22, 2010
I dont know when k3b stopped working but have just gone to burn a disk and when opening it tells me
Quote: No optical drive found. K3b did not find any optical device in your system. Solution: Make sure HAL daemon is running, it is used by K3b for finding devices.
I can boot from cd and can mount cds from within Slackware but for some reason k3b insists that i don't have a drive.
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Dec 14, 2010
Any idea, does RHEL5 support NTFS system.??
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Jan 14, 2011
How do I go about mounting a device if I don't know the file system type (e.g ext3, NTFS)?
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May 1, 2011
1.Can I install Suse Linux and RHEL 5 on same system (Laptop)?
How many OS can I install in one laptop?
My laptop name in Compaq Presario CQ42-462TU i5 M460 2.53GHz 3GB RAM 320GB Hard Disk
2. Can I install 64bit RHEL 6 and 32 bit RHEL 5.5 on same laptop?
I have RHEL 6 installed on my laptop, but when I try to install Suse Linux after hitting installtion button it starts loading lernel but then it blacks out and stays there for years.
It also shows some ACPI error when I tried to install second LINUX OS .
3.What should I do? Should I change my newly brought laptop?
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