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.
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.
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..
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:
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:
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.
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.
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.
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!"
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:
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.
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.
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
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.
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:
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.
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.
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?
