Server :: Device Mapper Not Recognizing RAID Storage Luns On RH5?

Feb 26, 2010

Greetings Fellow Knights Of The Penguin Clan....!I am having issues with device mapper seeing a 275GB Raid5 Lun from my SAN storage.I'm using IBM 2145 San Volume Controller.I am able to see a 40 GB Raid 10 device though..

fdisk -l |grep 'dm-*'
Disk /dev/dm-6: 42.9 GB, 42949672960 bytes


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Ubuntu Installation :: Dual Boot SSD Non Raid - 1 Terabyte Raid 1 Storage "No Block Device Found"?

Sep 15, 2010

It's been a real battle, but I am getting close.I won't go into all the details of the fight that I have had, but I've almost made it to the finish line. Here is the set up. ASUS Z8PE-D18 mother board 2 CPU, 8 Gig Ram. I recently added an OCZ Agility SSD, defined a raid 1 virtual disk on the 1 terabyte WD HDD drives, which will holds all of my user data, the SSD is for executables.The bios is set to AHCI. Windows 7 installed fine, recognizes the raid VD just fine.

I installed Ubuntu 10.04 by first booting into try and mode, then opening a terminal and issuing a "sudo dmraid -ay" command. Then performing the install. I told it to install the raid components, and told it to let me specify the partitions manually. When setting up the partitions, I told it to use the free space I set aside on the SSD from the Windows 7 install as ext4 and to mount root there. Ubuntu installed just fine, grub2 comes up just fine, and Windows 7 boots with out a hitch, recognizing the mirrored partition as I indicated previously. When I tell grub to boot linux however, it pauses and I get the "no block devices found" message. It will then boot, but it does not recognize the raid array. After Ubuntu starts up I can run "dmraid -ay" and it recognizes the raid array, but shows the two component disks of the raid array as well. It will not allow the component disks to be mounted, but they show up which is annoying. (I can live with that if I have to)

I have fixed a similar problem before by setting up a dmraid script in /etc/initramfs-tools/scripts/local-top ... following the instructions found at the bottom of this blog:[URL].. To recap: My problem is that after grub2 fires up Ubuntu 10.04.1 LTS (Lucid Lynx), it pauses, and I get "no block devices found" It then boots but does not recognize the raid array untill I manually run "dmraid -ay". I've hunted around for what to do but I have not found anything. It may be some timing issue or something, but I am so tired of beating my head against this wall.

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Software :: Cann't Find The Device Created Through Device Mapper In /proc/partitions?

May 15, 2011

Recently, I created a device sc0 through device mapper. The divice could be found in /dev/mapper/sc0. My problem is that the device doesn't exist in /dev/partitions which will block my following test.BTW, I found dm-0 in /dev/partitions. Is it the same as /dev/mapper/sc0? But the device /dev/dm-0 doesn't exist!

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Ubuntu Servers :: 9.10 Server/Raid 10 Setup - HDD - Not Recognizing The Full Capacity Of The Drives

Mar 12, 2010

I have a total of 4 hdd's, 500gb 7.2rpm that I would like mirrored using raid 10. As you can see from the image, ubuntu 9.10 server isn't recognizing the full 2tb's. In fact, I'm not even sure about the configuration as I was thinking the HDD's would come up as four 500gb hdds. Instead I have the configuration above set and ready for Ubuntu to be installed on.

1. Is this typical of a server pre-configured from Dell(perc6 raid controller.

2.Why is ubuntu not recognizing the full capacity of the drives especially when it's a server install?

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Server :: Network Storage - CIFS / RAID Or ISCSI

Jul 7, 2011

I am interested in turning my home server into something that I can store backups on. I do photography and therefore have a lot of photos. I use Mac OS X for my photo editing, so it must be accessible from my Macbook. I am new when it comes network storage servers, so what would be the best solution for me to be able to backup my photos seamlessly? I would like it easy enough so others can backup files without any terminal commands and such. What would you suggest? CIFS? RAID? iSCSI?

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CentOS 5 :: Install HW RAID Partitions As /dev/md Instead Of /dev/mapper/isw?

Feb 4, 2010

I am trying to setup a H/W RAID-1 matrix but I am unsuccessful. I am trying to get partitions installed as /dev/md0, /dev/md1 but it keeps going for /dev/mapper/isw...The reason is that I have R1Soft backup and it needs to hook the partitions as seen in /proc/partitions from /dev not /dev/mapper/isw. I have tried to boot the installation with various options but nothing!

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Server :: Mounting A Storage Device Of Other Servers Using NFS On Another Server

Aug 2, 2011

Setup1: Two rack mounted servers with a common storage device serving as the home directories for users on the servers. The storage device is a gfs partition mounted on the servers as the home directory using SAS cables. These servers have RHEL 5.4 as the installed operating system.

Setup2: A standard tower server with Debian 6 as the operating system used for tape backups. This has a tape drive connected to it.

Question: How to mount the storage device of setup1 using NFS on the server in setup2.

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Ubuntu :: LV Extended 9.10 Not Recognizing Added Storage

Mar 26, 2010

I have learned a little about LVM through tinkering but on my new setup I am having trouble. I am running Ubuntu 9.10 Server with Gnome desktop 64 bit. I started with a 2TB HD and setup LVM with a LV for my data ("Storage) that mounts at /storage. That is full so I then added a second drive 500GB, formatted, added to VG and then extended the LV "Storage" with the 500GB partition. Now the LV reads as ~2.2TB which is right. Everything is successful up to this point. Except now when I go to the mounted LV at /storage Ubuntu shows it as full and only as ~1.7TB. The 500GB were never added!

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Hardware :: Red Hat (RHEL 5.6) Device Mapper Not Seeing LUN Changes?

Jun 23, 2011

Dell PowerEdge R610 with QLogic HBA card connected to HP EVA6000 SAN through a pair of switches.When I present space to the server, device mapper doesn't see it unless I restart the multipathd service. Same thing with unpresenting - the /dev/mapper/mpatha does not go away unless I restart multipathd.Here's what it looks like in 'multipath -ll' before and after I unpresent the LUN (without restarting multipathd)...

== BEFORE ==
# multipath -ll
mpathb (3600508b40010716b0000900001a40000) dm-8 HP,HSV200


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Server :: Use The NAS Storage Device To Store The Home Directories Of User?

Jun 15, 2011

we have purchased the Dell PowerVault NF 500 NAS Storage Box with Window Storage server 2003 is Installed.we have LDAP server for authentication the user in network for accessing network resources.All ubuntu users on client side use ubuntu(LDAP server )for user authentication.when a user logon on client side machine his home directory is created on client machine .

but we want to use the NAS storage device to store the home directories of user.we want to implement that ,whenever a user logon his home directory is created on powerValut NF 500 storage device so that all user data is stored centrally for taking the backup .we want to mount NAS storage device so that user uses when they login and create user profile.

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Networking :: Increase Storage Space Of Server With NAS/DAS Device Via Gigabit Ethernet?

Feb 8, 2010

Cost effective (the people want cheap) solution to increase server storage space with as little impact on throughput (what I want) as possible. I have a server that sends instructions to 20 clients to perform certain tasks. The clients send gigs of data back to the server for storage.

Network: Gigabit Ethernet
Clients: (20) HP, Solaris, Linux
Linux Server: Dell R805 PowerEdge (QUAD Core Athlons 16 gigs of ram, 4 gigabit ports.

Selected directories are mounted (NFS) by clients. One directory to be mounted by the clients contains executable files. Mount commands are sent from the server (rsh) to the clients. Yes I know (ssh) but this is how the software was originally written so let's go with it.

The clients then receive commands to execute the binaries contained within the mounted directory. The binaries basically create an image of the clients filesystem including special applications. The client then sends the files and directories to the server which stores this �image�. This process can be reversed to restore a client to the initial baseline image.

In a nut shell, 20 clients are sending gigs of data to the server for storage. I need to attach a NAS (gigabit) to extend the storage capability of the server. The server would mount (NFS) to the hard drives on the NAS. The NAS, configured as a �direct attached storage� device (DAS), means the storage device is connected directly to the server and not the network (which makes it a DAS). This would provide direct storage expansion for the server. However, this configuration cannot be a bottleneck that significantly hinders performance.

Clients <---data---->Server<----storage---->DAS/NAS

1) Will a low end NAS (gigabit port) work? (NetGear 1TB ReadyNAS Duo, RND2110-100NAS) or something with a higher rated throughput (QNAP TS-239 Pro II)

2) Low end won't work, go with �?

3) Does the processor on the NAS play any role that would determine the performance of this configuration given that the server would mount directly to a directory on this device (DAS/NAS)?

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Red Hat / Fedora :: Pvcreate /dev/mapper/disk_bin : Device Not Found?

Feb 28, 2011

I'm facing a problem on Boot on San installation, Os is installed, now I'm trying to define mapper device

for others lun/disk with alias for multipath references
Code: # pvcreate /dev/dm-14 /dev/mapper/disk_bin_rac
Device /dev/dm-14 created


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Slackware :: 13 Cryptsetup Luks Wrong Device Name In /dev/mapper/*?

Mar 3, 2010

Slackware 13 Kernel have three hard drives. Root is on own drive sda1. sdb and sdc are raid via mdadm with two partitions. one for /home raid0 md0 one for swap raid1 md1. md0 is encrypted vi cryptsetup. md1 is encrypted vi fstab. everything boots fine and is accessible. However, /dev/mapper/* shows sda1 as block device connected to the raid md0. swap crypted device is correct in /dev/mapper/*. fstab is set correctly. problem seems to be with initrd. I would like the correct device in /dev/mapper so that I can access drive info; size, available space, etc. now info shows only sda1 info

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CentOS 5 :: Prevent Device-mapper From Loading In Installer

Mar 5, 2009

I am trying to prevent the dm_mod and friends from loading during install.I am installing by PXE boot with NFS and kickstart files over http. This works fine for other machines.Ok, I have a Dell PowerEdge 2900 III with 8gig ram, PERC 6/i raid controller.The raid has 8 1TB drives in it, so the total size of the device is >2TB.There is also an SATA drive, which is NOT on the raid controller.

The problem is, I want to install CentOS on the SATA drive. The SATA drive comes up as a device-mapper drive, with a big crazy device name.This is ok, but the problem is, when the system goes to boot, it just says 'missing operating system'.I can't boot from the raid because it is large enough to require a GPT partition, and CentOS says it can't boot from a GPT partition.The SATA drive would work FINE if I could just prevent the damn device mapper from loading, so that I could install on the SATA drive in ordinary SATA mode.

I have tried re-squashing the stage2.img with /etc/modprobe.conf with alias dm_mod off and such, no luck.I also tried adding an /etc/modprobe.d/blacklist file, that did not work either.I also tried putting blacklist= dm_mod in the kickstart file, but that seems to be a fedora-only option and it kills my install. any ideas on preventing the dm_mod et. al. from loading at install time??

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Software :: Device-mapper-multipath - Slow Failover Period

May 10, 2010

I have a linux machine, attached to a fibre channel SAN.

We're in the testing phases and we're attempting to get all of the bugs worked out before this goes live.

If i have my host streaming data to the storage device on the san (or from the device on the san) and simulate a path failure (by shutting down one of the host's ports on the FC switch), multipath does not pick up on another path until about 45 seconds have passed.

I can verify this by watching the statistic graph (which updates once per second) on the storage system.

I see iops running along rather nicely, and then they drop to 0 for 45 seconds, then pick right up to normal again.

This is a RehHat EL 5.5 system, with qlogic HBA's.

Am i being too picky? I'd expect multipath to recover in under 30 seconds, so as to not alarm host applications running on the linux host... 45 seconds seems like a long time to wait for a disk operation to complete.

Any tips on tuning Multipath, or the qlogic card? As it is, i've got the following options in my modprobe.conf.

alias scsi_hostadapter2 qla2xxx


My multipath.conf looks like:


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Server :: Mounting Multiple LUNs Over 1 HBA?

Apr 27, 2011

Is it possible to present multiple LUNs from 1 SAN with 1 NFS server? Currently, my NFS server is directly connected to my FC SAN. Do I have to install and configure multipathing for this to work OR is this just not possible to do over one connection?

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CentOS 5 :: Yum Update Dep - Device-mapper-event Is Needed By Package: Lvm2

Sep 8, 2009

Trying to do a yum update to get everything to latest, towards the end it says this:


how to get around this? I tried yum clean all, then yum update, again but it did the same. I had other deps missing on other servers but yum clean all fixed them -- can't find anyone else who's had this specific issue either, nor an rpm called 'device-mapper-event' or the other things that are missing - am kinda stuck!

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Server :: Multipathing Check How The Luns Are Configured

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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Ubuntu :: Error: Device-mapper: Reload Ioctl Failed: Invalid Argument

Jun 13, 2010

I'm having some difficulities with truecrypt and cannot figure out what's wrong since this is my first attempt to create hidden encrypted partition. I'm using ubuntu 9.10 64b with latest 6.3a truecrypt. After using truecrypt gui (just command truecrypt) I've tried: create volume-->create volumne within a partition/drive-->hidden trucrypt volume --> select some /dev/sdX by my choice --> select aes & sha512 --> password --> and format it.

when formating finished message "wrong ss, swith or wrong superblock of /dev/loop0" appeared. I've got no idea what could I do with it neither know whats program trying to do! Ok formating's done, then if you're trying to mount that partition then I would expect prompt for password, but that did not happen ...

EDIT: sudo mount /dev/loop0 /media/tmp/ also complaint about wrong superblock, but that does not ring any bell since i've got no idea what /dev/loop0 is or is for...

EDIT2: I've tried another approach also:

sudo truecrypt -t -c
sudo truecrypt -t /dev/sda3 --filesystem=none

but the first command finished creating 100G drive in 1 sec (nonsense) and latter one prints:

Error: device-mapper: reload ioctl failed: Invalid argument
Command failed

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Ubuntu Security :: Dmsetup - Device-mapper - TrueCrypt - And Desktop Icon Labels

Jul 8, 2011

Anyone know how device-mapper works, or can someone point me to any docco (other than the man page)?

Couple years ago I wrote a TrueCrypt wrapper script for use on Puppy Linux, and am reworking it for Ubuntu. Puppy sometimes didn't have the 'dmsetup' device-mapper utility available, but TrueCrypt still works without this when the '-m nokernelcrypto' option is used.

My script notices when dmsetup is available and skips this option. When the TC volume gets mounted (somehow using dmsetup), the Desktop icon is labled with the leaf name of the /media/mount_point -- so far, so good.

However, if I force the script to add the no-kernel-crypto option, and the TC volume is mounted without using dmsetup, the Desktop icon ls labled with the size of the volume. Say what?

Running df shows the difference between the two mounts is whether /dev/mapper is used. So *how is* dmsetup making this happen? The manpage isn't much help. Is it just the 'rename' sub-command? I am unable to find any details about this mechanism.


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Hardware :: Retrofitting A Device File For A Mass Storage Device?

Jan 7, 2010

here we have an older digicam (Jenoptik/Exakta Model "DC 22", if someone might want to know) that can be switched between some "PC Camera mode" and "Mass storage mode".Unfortunately, if attached to USB, it is always recognized as

UDEV [1262910483.475886] add /class/video4linux/video0 (video4linux)
lsusb tells:


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CentOS 5 :: 5.3 In VMWare ESX - Device-mapper: Dm-raid45: Initialized V0.2429 Waiting For Driver Initialization

Apr 2, 2009

I run many 5.2 virtual machines inside of VMWare ESX3.5 I've updated a couple of test VMs from 5.2 to 5.3. The thing that stands out is that during boot time, the sequence gets to this stage:

device-mapper: dm-raid45: intialized v0.2429 Waiting for driver initialization.

Here it takes about 3 times longer than the previous Centos 5.2 (about 9 seconds instead of 3). Whereas inside a physical box the wait in 5.3 is the same as it was in 5.2

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Server :: RAID Device Resyncing Sporadically?

Jan 11, 2010

I have a desktop server set up with 3 x 1Tb disks set up in a number of partitions. Some are under RAID 1, others under RAID 5. eg:

md0 : active raid1 sdc2[2](S) sdb2[1] sda2[0]
513984 blocks [2/2] [UU]


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Server :: Mdadm Continually Accessing Raid Device

Dec 4, 2010

I have an Linksys NSLU2 with four usb harddrives attached to it. One is for the os, the other three are setup as a RAID5 array. Yes, I know the raid will be slow, but the server is only for storage and will realistically get accessed once or twice a week at the most. I want the drives to spin down but mdadm is doing something in the background to access them. An lsof on the raid device returns nothing at all. The drive are blinking non-stop and never spin down until I stop the raid. Then they all spin down nicely after the appropriate time.

They are Western Digital My Book Essentials and will spin down by themselves if there is no access. What can I shutdown in mdadm to get it to stop continually accessing the drives? Is it the sync mechanism in the software raid that is doing this? I tried setting the monitor to --scan -1 to get to check the device just once, but to no avail. I even went back and formatted the raid with ext2 thinking maybe the journaling had something to do with it. There are no files on the raid device, it's empty.

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Server :: Mount Raid Device To Recover Data?

Aug 20, 2009

In a nutshell, our RAID 1 array was rendered broken and we were advised that core lib files were missing and the OS needed to be reloaded... a quote from our server host:"The OS is not healthy.This server will need a reinstall.
Libs are missing." This was after having replaced what we though was a faulty /dev/sdb. So they reloaded the OS (Debian 5.0.2 x86_64) on 2 FRESH drives, and installed the old /dev/sda as /dev/sdc once the reload was completed. Here's the output of /etc/fstab on the fresh install so we know what we're working with:


debian:/BAK# cat /etc/fstab
# /etc/fstab: static file system information.
# <file system> <mount point> <type> <options> <dump> <pass>


The one problem I see myself running into is /dev/md1 and /dev/md2 are currently in use by the new system, so I cannot mount it there. I should also note, reloading the OS is a viable option if needed as we haven't started configuring the server yet. So if we need to reinstall the OS and assign the NEW RAID arrays to something other than /dev/md1 and /dev/md2 then we can do that.

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Server :: Reducing The Size Of A Device In An Existing RAID Set?

Sep 9, 2009

Alternate Heading: Unable to use opensuse partitioner to fully format a Seagate 1Tb drive OK. Swapped over a motherboard to increase the number of slots available for hard drives so that I could expand my raid array (4 X 1Tb drives). Discovered I had no thermal paste so all delayed for 24 hours while I bought some, miscalculated on rebuild and had to reinstall OpenSuse but in the end system is now up and running. Unfortunately when I formatted my new 1Tb drive (Seagate) it formats to 931.50 Gb while the other 4 drives formatted to 931.51 Gb (they are WD). I'm now in the position that when I try to add this new drive I get :

mdadm: /dev/sdc1 not large enough to join array

Is there any way I can resize the existing devices down to 931.50 Gb so that I can add in the new drive without having to restore the array?

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General :: Command To Show The Luns Mapped To Redhat Enterprise Server 6.1 Host?

Nov 15, 2010

command to show the luns mapped to redhat enterprise server 6.1 host. And how do i known the WWNN for the FC HBA attach to the host.

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Debian Installation :: Use The PC As A File Server With Two Drives Configured As A RAID 1 Device?

Nov 3, 2010

I just installed Debian 5.0.4 successfully. I want to use the PC as a File Server with two Drives configured as a RAID 1 device. Everything with the RAID device works fine, the only question I have belogs to the GRUB 0.97 Booloader. I would like to be able to boot my Server even if one of the disks fail or the filesystem containing the OS becomes corrupt, so I configured only the data partitions to be a RAID 1 device, so on the second disk should be a copy of the last stable installation, similar to this guide:[URL]...


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Ubuntu :: Get Raid 5 Set Up As Storage?

Mar 14, 2010

I am trying to get raid 5 set up as storage. I have karmic with myth set up on primary drive and wish to just use raid 5 for storage with jfs filesystem.

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Fedora X86/64bit :: Device-mapper - Reload Ioctl Failed - Invalid Argument Failed To Suspend LogVol00

Sep 10, 2009

I've read hundreds of threads on this problem but they seem to be intermittent and the resolution has been using a different kernel version.

I'm using the latest kernel but I still have this problem

Running Logical Volume Manager gui and attempting to extend the volume results in the same error.

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