Fedora :: Boot Can't Access Ext4 Partitions On LVM Logical Volumes On RAID Array?

Feb 8, 2011

i have a fedora 11 server which can't access the ext4 partitions on lvm logical volumes on a raid array during boot-up. the problem manifested itself after a failed preupgrade to fedora 12; however, i think the attempt at upgrading to fc12 might not have anything to do with the problem, since i last rebooted the server over 250 days ago (sometime soon after the last fedora 11 kernel update). prior to the last reboot, i had successfully rebooted many times (usually after kernel updates) without any problems. i'm pretty sure the fc12 upgrade attempt didn't touch any of the existing files, since it hung on the dependency checking of the fc12 packages. when i try to reboot into my existing fedora 11 installation, though, i get the following screen: (click for full size) a description of the server filesystem (partitions may be different sizes now due to the growing of logical volumes):


- 250GB system drive
lvm partition rest of driveVolGroup_System


except he's talking about fake raid and dmraid, whereas my raid is linux software raid using mdadm. this machine is a headless server which acts as my home file, mail, and web server. it also runs mythtv with four hd tuners. i connect remotely to the server using nx or vnc to run applications directly on the server. i also run an xp professional desktop in a qemu virtual machine on the server for times when i need to use windows. so needless to say, it's a major inconvenience to have the machine down.

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Red Hat / Fedora :: Trouble Formatting RAID 1 Array To Ext4

May 24, 2011

I'm trying to install SL6 to a pair of 2TB harddisks in a RAID 1 array. The problem is that when the "Formatting" progress window that says "Creating ext4 filesystem on /dev/mapper/pdc_eahgdeafbgp1" comes up it appears to eventually freeze. It's been like that for 6 hours without the progress bar moving at least. I have another identical system that I booted up using the gparted live cd to see if I could get any more information using that. I first created a 500MB ext4 partition and mkfs.ext4 ran almost instantly. I then tried 5GB and it seemed to take maybe about a second or two and worked fine. I then jumped up to 500GB and it's been running for about 5 hours now. I'm pretty sure that I remember the creation of an ext4 filesystem occuring extremely fast even for very large partitions, but this is the first time I've played with RAID.

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Fedora :: Access To Volumes In RAID?

Aug 7, 2011

I was finally upgrading from F12 to F14, and as you'd expect from someone posting for the first time here, I did something stupid. My system has two drives set up as RAID-1 with LVM for the entirety of them. I added a new drive to use as the boot & OS drive, but during the install process I believe I somehow managed to wipe the LVM information from the RAIDed drives (though I did not install to them or format them).

While I have a working F14 install on the new drive, I would like to get access to the data I have on the RAID. However, the LVM tools show the RAID drives as uninitialized. If I try booting off the RAID, it gets partway through the bootup (the white part of the progress bar gets about halfway) before displaying "No root device found. Boot failed, sleeping forever." This occurs regardless of whether I have the new drive plugged in or not. I've been googling for the past several hours and haven't found anything that allows me to access the the volumes on the RAIDed drives.

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Fedora Installation :: 15 - LUKS Encrypted Logical Volumes Not Mounting On Boot

May 26, 2011

I have a setup that looks like this


and I'm dumped into recovery mode. However, if I remove these mounts from /etc/fstab via comments, I can wait for the system to boot (which it does very quickly) then mount the mapper devices myself. So what is going on? Has something changed wrt logical volumes, or is this just systemd? I can live with manual mounting, but any advice on resolving the automatic mounting situation would be great.


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Ubuntu Installation :: Number Of Partitions / Logical Volumes Can Create Using Partman-auto Recipes?

Mar 2, 2011

Is there a limit to the number of partitions/logical volumes you can create using the partman-auto recipes? If not, any thoughts on why my preseed using the values included below results in only a /boot partition and logical volumes root, swap, and user? Is there another way to achieve putting /, /tmp, /var, /usr, /usr_local /opt, etc on their own logical volumes with preseeding?

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Slackware :: Cannot Access Anything / Won't Mount Any Of Logical Volumes

Nov 15, 2010

I upgraded aaa_elflibs as per Eric's advice here:URL..Now I can't access anything.it boots into tty1 and won't mount any of my logical volumes.

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Red Hat :: Logical Volumes Not Detected During Boot

Jan 28, 2010

I have a system where the logical volumes are not being detected on boot and would like some guidance as to how to cure this. The box is a Proliant DL385 G5p with a pair of 146 GB mirrored disks. The mirroring is done in hardware by an HP Smart Array P400 controller. The mirrored disk (/dev/cciss/c0d0) has 4 partitions: boot, root, swap and an LVM physical volume in one volume group with several logical volumes, including /var, /home and /opt.

The OS is a 64-bit RHEL 5.3 basic install with a kernel upgrade to 2.6.18-164.6.1.el5.x86_64 (to cure a problem with bonded NICs) plus quite a few extras for stuff like Oracle, EMC PowerPath and HP's Proliant Support Pack. The basic install is OK and the box can still be rebooted OK after the kernel upgrade. However, after the other stuff goes on it fails to reboot.

The problem is that the boot fails during file system check of the logical volume file systems but the failure is due to these volumes not being found. Specifically the boot goes through the following steps:

Red Hat nash version starting
setting clock
starting udev
loading default keymap (us)
setting hostname
No devices found <--- suspicious?
Setting up Logical Volume Management:

fsck.ext3 checks then fail with messages: No such file or directory while trying to open /dev/<volume group>/<logical volume> There are also messages about not being able to find the superblock but this is clearly due to the device itself not being found. If I boot from a rescue CD all of the logical volumes are present, with correct sizes; dmsetup shows them all to be active and I can access the files within. Fdisk also shows all the partitions to be OK and of the right type. I am therefore very sure that there is nothing wrong with the disk or logical volumes....

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Fedora :: Failed Boot With Kernel And SW RAID Volumes?

Apr 24, 2010

First post so please excuse my lack of correct terminolgy/understanding/etc. Running Fedora 12 with the following software raid setup...

Mount Device Underlying Partitions
/ /dev/md0 /dev/sda1 /dev/sdb1
swap /dev/md1 /dev/sda2 /dev/sdb2
/home /dev/md2 /dev/sda3 /dev/sdb3

Recently updated to kernel and upon restart, failed to boot. Get stuck at a recovery prompt asking for root password or Ctrl-D to continue (which reboots system). I worked around this problem by reverting to the previous kernel From what I can tell, with the newer kernel there is a problem with device enumeration of software raid volumes.


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Ubuntu :: Logical Partitions Within Software RAID?

Oct 4, 2010

So, over the next couple of days I'm going to be building a new file server based on Ubuntu with three 2TB drives (and possibly a pair of 500GB drives I already own) in RAID 5 using mdadm. I'm under the impression that I would be able to add the 500GB drives using mdadm; while all drives need to be of the same capacity for hardware RAIDs, software RAIDs are able to work with different-sized volumes. Is this correct?

i right in thinking that mdadm presents the RAID as a drive which can then be used like a single drive would be? create a logical partition within the RAID formatted with HFS+ which can be used for network-based Time Machine backups for a few Macs in my house.Now, this is where I particularly show my ignorant side: is it possible to create a logical partition with a variable size? Similar to how a virtual hard drive works with some virtual machines; a "drive" may take up to 200GB, for example, but is only as large as the amount of data it stores. If it is possible, is this only for certain partition formats?

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General :: Unable To Access Intel Fake RAID 1 Array In Fedora 14 After Reboot

Jan 6, 2011

1st I am relatively new to linux (but not to *nix). I have 4 disks assembled in the following intel ahci bios fake raid arrays:

2x320GB RAID1 - used for operating systems md126
2x1TB RAID1 - used for data md125

I have used the raid of size 320GB to install my operating system and the second raid I didn't even select during the installation of Fedora 14. After successful partitioning and installation of Fedora, I tried to make the second array available, it was possible to make it visible in linux with mdadm --assembe --scan , after that I created one maximum size partition and 1 maximum size ext4 filesystem in it. Mounted, and used it. After restart - a few I/O errors during boot regarding md125 + inability to mount the filesystem on it and dropped into repair shell. I commented the filesystem in fstab and it booted. To my surprise, the array was marked as "auto read only":


and the partition in it was not available as device special file in /dev:


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Debian :: Setting Up A RAID Array With Multiple Partitions

May 23, 2011

I need to set up a RAID 1 array on Squeeze. I have 3 partitions: sda1 is root, sda5 is home, and sda6 is swap. (sda2 is the extended partition containing home and swap. This was a clean installation, so I don't know what happened to sda3 and sda4...)

All the information that I've been able to find recommends doing something like this:

mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sdb1 /dev/sdc1

Do I need to type a separate command for each partition, or is there a better way to do it? Also, should I use the UUID instead of the dev names?

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Fedora Installation :: New Install Selections To Preserve User Data In Logical Volumes?

Apr 1, 2009

I have Fedora Core 8 installed. I would like to reinstall it so as to get back commands that have been lost. To preserve my user data that has been stored in logical volumes, what selections should I make in the installation process? Are these selections essentially the same for Fedora Core 10?

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Ubuntu :: How To Access EXT4 Partitions From Win7

Feb 12, 2010

How can I access ext4 partitions from windows 7?

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OpenSUSE :: Normal User Rw Access To Ext4 Partitions?

Nov 13, 2010

I need to access sdc2 & sdc4 from SUSE, have shared the partitions already but i am unable to write data there. I checked permissions, it says only owner can change the permission. I need to get rw access for a normal user. Have chmod it already but it didnt work.

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OpenSUSE Hardware :: ERROR: Bad Logical Partition 6: Enlarged Logical Partitions Overlap

Aug 22, 2011

After fixing drive partition numbers, I got the following error from cfdisk: Code: FATAL ERROR: Bad logical partition 6: enlarged logical partitions overlap Press any key to exit cfdisk However, I can see all my partitions with fdisk and gparted, I can mount and use all of them.I used the following guide to fix the drive numbers order: Reorder partition drive numbers in linux | LinkedBits Does somebody know whet is cfdisks problem and how can I fix it?

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Fedora :: Can't Mount Ext4 Logical Vol Under New Kernel?

Dec 5, 2009

I have 250Gb, 500Gb and 1Tb drives concatenated together as one volume group (span) with a logical volume (spanvol). Under kernel it mounts totally fine. However, under, I get this:-

[root@undertaker ~]# mount -t ext4 /dev/mapper/span-spanvol /home
mount: wrong fs type, bad option, bad superblock on /dev/mapper/span-spanvol,
missing codepage or helper program, or other error


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Fedora :: Convert Ext4 Primary Partition To Logical?

Oct 17, 2010

I'm trying to convert big ext4 partition to logical. I was able to do that with Arconis Disk Director Home 11 with swap and ext3 partition, but it doesn't recognize ext4.

Unfortunately I can't copy 2TB data to another HD Now I have:

Pri /boot ext3
Log / ext3
Log swap swap
Pri /media/X ext4 <- 2TB

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General :: Cloning Logical Volume And Swap And Boot Partitions?

Feb 28, 2011

I have a RHEL4 system with 2 250GB physical volumes. There is a boot partition that is outside LVM and 2 logical volumes (swap and root) within a single volume group. This volume group bridges the 2 physical volumes.

I would like to clone this system onto a single 1 TB physical volume that will replace the 2x250GB currently in use.

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Fedora X86/64bit :: Use Fedora / Linux Raid Program To Manage Raid Array?

Jun 24, 2009

I've tried to install Fedora 11, both 32 and 64 on my main machine.It could not install as it stops on the first install window. I've already filed a bug but really haven't seen any feed back yet.The bug has something to do with Anaconda and the Raid array but I really can't tell.

I have an Intel Board (see signature). I am running intel raid software under W7 currently.It works fine. But, I'm wondering, when I attempt to install F!!, is my current raid set-up causing problems? Do I need to get rid of the intel raid software and use a Fedor/Linux raid program to manage the raid array??

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General :: Software RAID Device Not Recognized - Can't Access Array

Aug 3, 2010

We ran out of space on our server hard drive, so I installed 2 x 1GB drives, set them up as a software RAID1 array, copied the contents of /home to it, mounted it as /home for testing. Everything OK, so I unmounted it, deleted the contents of the /home folders (don't worry, we're backed up), then remounted the array. Everything was fine until we rebooted. Now I can't access the array at all; during booting the error "mount: special device /dev/md1 does not exist" comes up twice, and manually trying toe same issue. The relevant line from fstab reads:

/dev/md1 /home ext3 defaults 0 0

However, using webmin shows only md0, the RAID0 device on which the OSD was originally installed. There is no /dev/md1 device file. The mdadm.conf file reads as follows:

# mdadm.conf written out by anaconda
DEVICE partitions
ARRAY /dev/md0 level=raid0 num-devices=2 uuid=76fd4050:fb820568:c9bd3a59:ad3e70b0

So it's not listed; I'm assuming this is significant. Am I right, and whether I am or not, what can I do?

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General :: Access Each Drive Of A RAID Array In Order To Update The Firmware?

Feb 2, 2011

I need to access each drive of a RAID array in order to update the firmware - I am completely new to linux. I think there are probably some potential challanges along the way to get this "working" For example, it seems to me that the array may present itself to application code as a single device. I need to drill down into the RAID and talk to each physical device in turn via some sort of pass-through mechanism. I'm currently pretty lost - can anyone point me in the "right" direction

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Red Hat / Fedora :: Mounting Volumes Representing Windows Partitions

Dec 16, 2008

I'm using fedora core 9 and I am a linux beginner. In my computer, I can see the icons representing windows partitions but cannot be opened. I right click on it and then opt for "mount the volume" . But there is no use. What can I do?

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Debian :: LVM Setup With 3 Logical Volumes?

Nov 25, 2010

I have done a recent install of Debian squeeze on a laptop. I set up LVM with 3 LV's, one for the root filesystem, one for /home, and another for swap. I then used lvextend to increase the size of the LV's. This additional space is shown if I enter lvdisplay (shortened for clarity):

- Logical volume -
LV Name /dev/auriga/swap
LV Size 4.66 GiB
- Logical volume -
LV Name /dev/auriga/root
LV Size 15.97 GiB
- Logical volume -
LV Name /dev/auriga/home
LV Size 169.01 GiB

However, if I use df, it still shows the previous size.
/dev/mapper/auriga-root 14G 8.0G 5.2G 61% /
/dev/sda1 221M 16M 193M 8% /boot
/dev/mapper/auriga-home 147G 421M 139G 1% /home

I have even tried restarting as well. I do not understand why df would still show that /home is 147GB, when I extended it to 169GB using lvextend. Similarly for the root, which was extended by 2GB from 14GB to 16GB.

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Debian :: Encrypted Lvm: How To Resize Logical Volumes

Apr 24, 2011

I have let the debian installer set up with separate partions forrootusrvarhometmpIt ended up with a huge home partition and little place for the others.So I wanted to give some of home's space to the others and didlvreduce on homelvextend on the others.Following some info on the net it tells you toe2fsck -f partition1 followed by aresize2fs partition1But when I try to fsck the reduced home partition I got the following error:The filesystem size (according to the superblock) is 73113600 blocksThe physical size of the device is 20447332 blocksEither the superblock or the partition table is likely to be corrupt!Abort? yesIs there any way to save this?

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General :: Encrypting Existing Logical Volumes

Jan 8, 2011

How would I go about encrypting my lvm2 logical volumes on Debian Squeeze? Is it possible without backing everything up to a different drive and restoring afterwards?

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General :: List Filesystems That Are Using LVM Logical Volumes?

Jun 23, 2011

I've read the first 40% of the RHEL 5 Logical Volume Manager Administrator's Guide, but still have one outstanding, burning question.

During the installation of Centos 5.6, I set up LVM physical volumes, volume groups and logical volumes. I can list these using pvdisplay, vgdisplay and lvdisplay commands.

How would I list what filesystems I have that are using my logical volumes?

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Server :: Maximum LVM2 Logical Volumes ?

Sep 15, 2010

Are there any maximum amount of logical volumes a LVM2 volume group can contain?

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CentOS 5 :: Use E2label To Label One Of Logical Volumes

Jan 6, 2011

I am trying to use e2label to label one of my Logical Volumes. the labeling is done successfully. but my findfs output is like this:


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OpenSUSE Install :: 11.1 Resize Logical Volumes Using Yast

Jan 20, 2009

i cannot resize mounted lvm volumes with reiserfs by using yast like in a previous version 10.x !?

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Slackware :: Nstallation CD When In A Pinch With A System On Logical Volumes?

Nov 3, 2010

I would like to ask if is it possible to boot Slackware with the installation CD when in a pinch with a system on logical volumes? For the usual fdisk partitions the procedure is known:

boot: root=/dev/sda1 noinitrd ro or something like that. This way, the system boots with mounted basic partitions. My question is whether there is an option to achieve the same if the system is installed on logical volumes? I need to do this on a machine with dual booting Windows + Linux. The Windows needs to be reinstalled, but as is well known, the boot sector will then be overwritten. So after the Windows reinstallation I will need to boot Slackware with the installation CD and run lilo.

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