Software :: RHEL 6 W/LVM Volume Duplication Breaks Multipathing?
Mar 9, 2011
We're trying to take an existing system running multipathed SAN boot disks, duplicate that boot disk to another system volume, and boot a second system up with all the same parts running like the first system (think: cloning the system).However, multipathing is broke on the second system 'm sure I'm forgetting something stupid here after thecloning).Details:We have a freshly installed RHEL6 on IBM PPCThis is a boot off of a SAN volume with two paths. Installation went great - multipathing was auto-detected and used underneath the usual LVMs for the boot volumes. Looks and works great:
Code:
[root@goldimage dev]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
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Sep 26, 2010
I have formatted a second internal drive as ext3. It worked fine until I copied (rsynch) my /home to the new drive. Now when I try to delete anything I'm forced to delete immediately or skip the deletion. I also tried moving the /usr/local directory to the second drive and it works fine, it doesn't break the Trash. I tried moving /home back to the root drive and the problem is gone. The second drive again works properly. I can reproduce this. The problem only occurs when I move the /home directory to the new drive.
# / was on /dev/sda1 during installation
UUID=89a54f23-98ef-45d2-bef9-47d51992fd01
/ ext4 errors=remount-ro 0 1
# swap was on /dev/sda5 during installation
UUID=fb609b91-7322-4903-9309-2f0d3a6b87d4
none swap sw 0 0
# My shared volume /dev/sdb1 (show it on desktop)
UUID=a726a583-03e5-47c6-9618-ddbfcdd4c1d6
/media/data ext3 defaults, users, exec0 0
# Moving /usr/local
/media/data/Ubuntu/usr/local
/usr/local bind defaults, bind, users, exec 0 0
# Moving /home
/media/data/Ubuntu/home
/home bind defaults, bind, users, exec 0 0
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Jan 18, 2010
I have run into some serious problems trying to start up RHEL AS4. I am trying to install Oracle on this box which by the way is running as a guest OS through VirtualBox. I was running with it fine yesterday. I was doing the prerequisites of updating the /etc/sysctl.conf file with additional kernel parameters. Prior to that I added another scsi virtual disk and extended a PV and left it at that for the night. I am since come back today and trying booting and am getting the following errors:
Volume group "VolGroup00" not found;
Couldn't find all physical volumes for volume group VolGroup00;
Couldn't find device with UUID "Some UUID of the device";
ERROR: /bin/lvm exited abnormally! (pid 318);
mount: error 6 mounting ext3;
mount: error 2 mounting none;
switchroot: mount failed: 22
umount /initrd/dev failed: Z
kernel panic - not syncing: Attempted to kill init!
I have tried running in rescue mode and it can find volume group VolGroup00. I also have installed Storage Foundation which includes veritas volume manager and other various veritas components. Does anyone have a clue what I am supposed to do here to get RHEL up and running again? I am running kernel version 2.6.9-42.EL if that helps as well.
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Jan 11, 2010
I encountered problem on my NEW PROD box. I have remaining space of 300GB and i decided the create a /dev/mapper/VolGroup00 using Redhat Gui. It is successful. Then, i decided to create logical volumes out of it..
lvcreate -L 10G -n rawdevice1 VolGroup00
lvcreate -L 30G -n rawdevice2 VolGroup00
lvcreate -L 10G -n rawdevice3 VolGroup00
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Nov 22, 2010
I've got an older RHEL4 system (2.6.9-34.ELsmp) which I am needing to migrate off of one LUN and onto another. My plan was to simply have the storage team assign me a new LUN and to setup LVM mirroring then remove the origional LUN. My problem is with the new LUN. I had to reboot to get the system to even see it. It now shows up in /proc/scsi/scsi but there is only one new device in /dev and I cannot even open the sd* device.. I can only open the dm-* device.
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Mar 30, 2011
Multipathing in linux -need to check how the luns are configuredI have no idea about luns configuration in linux environment(newbie) and now i have issue figuring out the configurationSenario,By the look of the multipath output 3 luns are connected to server1 is from Hitachi and 2 from Sunstorage(Thumper)What i am trying to achieve,I need to check how the 3 luns are configured on OS levelI need to differentiate Hitachi and thumper lun The next is to check whether 3 luns are mirrored or not (if not ,how they configured)The third and last .I need to remove the mirroring luns (if exist) and leave the system with only Hitachi lun
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Aug 25, 2010
How to device-mapper multipathing in conjunction with fdisk. I am more of a solaris expert and now trying to grasp linux (red hat). I have a server that I plan to cluster (future assignment) which is attached to a Netapp SAN via emulex LPe11002 HBA. I have 8 paths to the LUN I created and I can see the multipath device (/dev/mapper/mpath1). Below is my multipath.conf file:
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Question 1: When I look at fdisk -l, I can see all 8 paths to the same LUN. Although I partition /dev/mapper/mpath1, I can still see that 7 of the 8 still say "Disk /dev/sdX doesn't contain a valid partition table". I would think that all 8 would have this removed. I execute '/usr/sbin/lpfc/lun_scan all' and it doesn't work. I am looking to clean this up...what should I do? It seems weird to have to do it to all 8 paths!
Question 2: Why does my alias, 'db' not show up under /dev/mappers?
Question 3: Is there a way for fdisk -l to display one lun rather than displaying all 8 paths to the lun?
What is the standard procedure (commands) people execute when adding a new lun to a server with multipathing so it is nice and clean?
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Nov 11, 2010
this is my first post here .I have two issues related to grub2 I upgraded recently from ubuntu 8 to 10.04 and upgraded grub 0.98 to 1.98. 1-How to prevent Grub from detecting one of Windows installations? or how does grub detect Windows. I have 2 hdds, they were backup of each other. but no more, I deleted one Windows by deleting most of the files so therefore I don't need it to be present in Grub 2 menu. How do I delete this? any suggestion? 2-For some reason grub2 only work correctly from sdb , even though I chose to install grub2 to sda too, but it seems grub is trying to find grub files on the same hard disk instead of on sdb, therefore it goes into grub rescue mode with error "file not found" . I set my computer to boot from sdb for now. but I would like to learn how to make sda's grub work. before it used to work with grub 0.98.
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May 6, 2010
cant I simply take a working ubuntu hard drive and dd copy it onto another disk. Then put the disk in the other pc and it will work?
This way I could configure a machine at home, take the disk with me and use it at a place with no internet access.
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Mar 3, 2010
i've checked the link, and it makes it better. but it doesn't include all the information. i'll continue searching the internet. However i have seen an example of creating a fd:
Code:
exec 5<&1
echo "TEST" >&5
exec 5>&-
as in the page, this was intended to redirect the stdout to the fd 5 and create it, and close it. i have the following questions:- what is exactly the meaning of second command? is it to redirect the command stdout "test" to the fd 5? and how i can see the contents of the fd 5? - in the first command, why the < is used instead if > and what is the difference between the below two commands as in the info bash *Redirection section It will be helpful if anyone could include a graph for file descriptor before and after different command execution.
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Oct 23, 2009
I got a folder containing 20,0000 files (and will be more later), each of this file contains a single URL. What I am trying to do is to do statistics on number of duplicated URLs (file with same content) accumulated, say, from September to October by each day. For example, if file A was created in Sep 1st has a same content with file B created in Sep 15th, then we add 1 to number of duplication on Sep 15th (not Sep 1st). Currently I got a way to do it (in perl) as below:
(1) Read all files inside the folder, print out file content, and modified time into a big file in the format:
Code:
[URL] [month] [day]
(2) Sort the file by month then by day
(3) Then Create two hash : date and content
And then read url from each line into a hash 'content' from the big file (key is url, value left undef), for each new read url found in hash 'content', a duplication is detected, so mark '$date{$month.$day}++' The algorithm could be working but may take too long... so I am wondering if there is some easier way to do that besides hashes.
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Oct 13, 2010
I'm beginning to write a custom RTP implementation and want to test its resilience to UDP traffic. I've searched on the web and all the links I can find are for analysing actual traffic, not generating it or messing it up.
Does anyone know of any software (preferably free software) that will, for example, take actual UDP traffic and drop packets, duplicate some and make some arrive late/out of sequence?
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Apr 28, 2010
I have both ubuntu and kde-desktop installed, and after trying KDM, switched back to GDM which worked fine for a while (although KDE changed my other gnome settings like usplash and cursors which took a while to change back). A day later, though, when I start up my system, the screen flickers a few times then shows me a message that an x-server is already running, so hit no to try loading it on '0' again or yes to try another number.
If I hit no, it will briefly show me the KDE login screen refresh a few times and go back to the menu. If I hit yes, it refreshes about 7 times and finally shows the gnome login screen. This process takes a long time and I'm not sure is great for my screen.
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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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Feb 1, 2011
We are planning to migrate our LINUX server from RHEL 3to RHEL 5. What are the configuration difference between RHEL 3 to RHEL 5 for webserver installations?
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Apr 27, 2009
I have 4 partitions in my system, out of which two(sda1, sda2) have windows on them. I have installed RHEL 4 32 - bit on sda3 and after that , installed installed RHEL 64-bit on to a partition sda 5. Now i am unable to boot into RHEL 32-bit. The error i am getting is Error 13: Invalid or unsupported executable format.
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May 1, 2011
can not ping from host (RHEL 6) to RHEL 5 in (virtual)? I have stopped iptables on both machines. But still not able to ping from host machine to virtual.
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Jul 13, 2009
I have RHEL 3 and Win XP Installed in my P.C?I want to uninstall RHEL 3 and install RHEL 9 without affecting XP.how can i do this and also where can i download free RHEL 9 version or any other latest linux distribution for free?
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Feb 16, 2010
A client has sent me an RHEL 5.1 box for me to do some work on, but it's not registered with Red Hat. This is causing me problems, because it's a minimal installation, and I need some more dev software.My immediate reaction was to install various bits (emacs, and so on) from my Centos 5(.0) DVD.The base RHEL system only had one (disabled) repo entry,so I added a yum DVD repo entry in yum.conf.d.
This looked good to start with, but it doesn't work. Something in RHEL's pirut/yum/rpm/whatever is getting confused, and can't work out what is/isn't installed.
Question - how do you maintain an unregistered RHEL box? Has RH done something to make life difficult? Is my problem simply that I'm using a Centos 5.0 DVD, instead of Centos 5.1? Am I stuck with downloading lots of rpms from the net and doing everything manually? I really don't want to do that.
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Jun 13, 2010
I'm running squeeze (last updated today), and everything has been working great. There is only thing that would simplify my life minutely..Anybody know how can I have the volume buttons on my laptop change the "pcm" channel volume rather than "master"? If they could control pcm, then I could adjust the volume coming out of my headphones or my computer speaker (both controlled by pcm, but not master...seems strange to me) with just one click.I tried to find this info online, but all results seem to refer to an older version. The simple "click here, set this" solution no longer is possible.
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Feb 27, 2011
Debian Squeeze 6.0.0 on a Thinkpad T43, sound volume is not synchronized between the laptop volume buttons and GNOME's Volume Applet. So if I turn the volume all the way down with the physical buttons, the volume applet may still indicate 75%.I did not have this problem in Debian Lenny. Pressing the volume buttons used to show a volume bar on the screen, as did pressing the mute button.
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Jul 17, 2010
Is there a way to default volume to 100% in the terminal with gnome-volume-control-applet or any other program? I am setting up a dedicated Zsnes machine which boots into Fluxbox but the volume is muted by default. There isn't a man page for gnome-volume-control-applet.
When I log into Gnome the volume is set to 100%, but Fluxbox is always set to mute.
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Oct 29, 2010
I've got my xubuntu 10.10 install just about perfect on a little acer aspire d250, apart from a small sound useability issue: In the interests of simplicity and resource usage I removed pulseaudio. After a bit of fiddling I got it so that my USB soundcard (ProDac) is recognized and automatically set as the default soundcard when plugged in. Any sound applications automatically use the USB sound if it present, no need to around with pulse. The only problem is that my netbook's volume control keys still only control the master volume of the inbuilt soundcard, and have no effect on the usb sound. Does anyone know of a way to change which sound device these keys actually effect? I'd like to write a little script so that when the usb device is detected the keys are remapped.
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Mar 7, 2011
I'm running Kubuntu 10.10 32 bit on an old DFI KT600AL motherboard based system using the onboard VIA 3058 AC97 audio (because it supports front panel audio connections and none of the add-in PCI soundcards I have do). I have an old Gateway/STB TVPCI TV tuner card (mainly wanted the FM radio part to work) hooked up to the cd audio connector on the motherboard because the digital audio over the pci bus apparently isn't supported for this card (neither is the onboard analog mixer on the tv tuner card, I had to hack a CD-ROM audio cable and solder it to the audio outputs of the tv tuner module on the TV tuner card). When I use the master channel as the master channel (selected in Kmix) then as one would expect it affects the output volume of all other audio playing on the system except that which is being handled by the PCM channel. On Windows the PCM channel was also affected by the "Volume Control" slider such that ALL volume levels were reduced when moving the slider. I'm hoping someone can help me figure out how to make it work like this on Kubuntu.
First off I should warn you that I (like many users of older hardware that is not properly supported under PulseAudio) have uninstalled PulseAudio (because it's garbage) and am using Alsa to manage my audio hardware. I would think that there would be some way to do this using the 'amixer' application to add the PCM channel as a component of the 'Master' channel so that when the volume is turned down using the 'Master' channel control it will affect the PCM channel too (at least the output to the speaker jack, not necessarily the capture or mix volume though), but I'm not really any good at doing things from a terminal window and the options for the amixer command kind of confused me.
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Mar 24, 2011
I used Ubuntu 10.10 (64 bit) on IMac i7. As far as, I remember, after installing Pulse-Audio Equalizer, for each restart of the system, after login screen, system sets volume to maximum value. What can I do?
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Jun 12, 2010
since using 10.04 I have a big problem with my usb headset (freetalk everyman)
1. Problem: I cannot regulate the volume of the phones (output) anymore with gnome-volume-control. By default the volume is set to 100% which is way too loud. When I set it under 100% there is no sound at all. Values over 100% work.
2. Problem: The X server is freezing iregulary when I connect the headset and disconnect it, Magic SysRq works. I checked Xorg.0.log and found out that it recognizes the usb headset as keyboard:
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Jan 22, 2011
I don't know much about lvm and I've managed to screw up a drive. I had a 500GB drive with FC14 on it and I wanted to copy over a load of data to my new 1TB that was replacing it. I set up my new install the same way as the old...including the same volume names (error number 1 I think) I successfully mounted the old/500GB drive (using vgscan and vgchange -a y etc.) using a laptop (running FC13) and an external hdd cradle. I could access the files I wanted but this wasn't the machine I wanted to copy them to (I was doing this while waiting for the install to finish on the new drive).
When I tried the same process on the new install I found that having two lvm with the same name meant I couldn't mount the external one. So I opened the disk utility (palimsest) and was going to change the name of the old volume group but it wouldn't let me do that. I then thought maybe I could get away with just changing the name of the partition where the files were and maybe I could add it to the mounted group or something so I changed it to lv_home2. This changed the name of my new/1TB lv_home to lv_home2 as well. So thinking that wasn't the answer I just changed the name of the new lv_home2 back to lv_home.
From that point on I haven't been able to see the old drives partitions (the new volume group still works so far). I has a physical volume but the volume group and volume names are gone from view. When I try to vgscan on my main computer or the laptop I had it working on earlier I get:
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Dec 1, 2010
I'm rearranging a bunch of disks on my server at home and I find myself in the position of wanting to move a bunch of LVM logical volumes to another volume group. Is there a simple way to do this? I saw mention of a cplv command but this seems to be either old or not something that was ever available for linux.
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Sep 9, 2010
I'm using 10.04 now and it runs ok, except one strange thing in the Volume control applet. Sometimes, when I click on the volume slider, it moves up. Even if I try to slide it down, it moves up on every click. The same when I click left of it - it keeps moving up! This is very annoying at night when the music gets loud and wakes everybody. It happens with or without Compiz turned on
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Oct 31, 2010
I am struggling with a problem with the volume control... when i try to adjust the volume with the sliding bar i can not do it. If i put the scrollbar to the 0 position, it is muted. when i move it to anywhere else, i get the full volume. From other programs like vlc, i can adjust the volume with no problem.
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