Ubuntu Installation :: Move From Dmraid/fakeRAID To Software RAID?
Oct 10, 2010
About a year ago I bought a new compy and decided to get on-motherboard RAID, and by golly I was gonna use it, even if it wasn't worth it.
Well, after one year, two upgrades, a lot of random problems dealing with RAID support, and a lot of articles read, I have come to my senses.
The problem: I have a fakeraid using dmraid, RAID 1, two SATA harddrives. They are mirrors of eachother, including separate home and root partitions. I actually found the method I think I had used here: [URL]
The ideal solution: No need to reinstall, no need of another drive, no need to format.
My last resort: Buy a drive, copy my home directory, start from scratch, copy my stuff over.
PS: if it matters, I'm on 64 bit 10.04 LTS
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Jan 24, 2011
I'm trying to rescue files from an Iomega NAS device that seems to be corrupted. This is the Storcenter rack-mount server - four 1tb drives, celeron, 1gb, etc. I'm hoping there's a live distro that would allow me to mount the RAID volume in order to determine if my files are accessible. Ubuntu 10.10 nearly got me there but reported "Not enough components available to start the RAID Array".
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Oct 1, 2010
I have recently installed Ubuntu 10.04.1 lts server on my Intel "fakeraid" (software raid) (2x250 sata).To test my RAID 1 I turned off one HD and start the system.The first screen (Intel software screen) show Status = Degraded, but the system starts normally with just one HD.Then I turned off the system and turned on the HD again, so the first screen (Intel software screen) shows Status = Rebuild. If I enter in the software raid panel the folowing message is showed: "Volumes with "Rebuild" status will be rebuilt within the operating system"The system starts normally... but this message status stays permanently even I restart the system again
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Nov 27, 2010
I have two Ubuntu 8.04 servers currently. I've purchased some 500 GB hard drives and a RAID cage just yesterday and plan to change my current servers to using RAID1 with the hard drives. Much like everyone else, I have the nVidia RAID built onto the motherboard that I plan to use. There are many how-to's out there on how to setup RAID using dmraid during the install process - but what would a person do if they are simply changing over to a RAId system? I installed dmraid a few days ago on the server. It seems that even though I have RAID shut off in the BIOS, it saw the one and only drive as a mirrored array. When I rebooted today, the server would not start; it had ERROR: degraded disks.. bla bla. Then Grub tried to start the partition based off the UUID of the drive (which was not changed) and it said "device or resource busy" and would not boot.
This problem was corrected by going into the BIOS and turning on RAID. When I rebooted, the nVidia RAID firmware started and said degraded. I went in there and deleted the so-called mirror keeping the data intact. Rebooted, disabled the RAID feature in the BIOS and then the server loaded normally with a message "NO RAID DISKS" - but at lest it did boot! So this leads me to believe that trying to turn on a RAID-1 array (just mirror between two disks) may be a challenge since I already have the system installed. I will be using Partimage to make an image of the current hard drive and then restore it to one of the new drives.
The next question is - is it a requirement that dmraid is even installed? While I understand that the nVidia RAID is fake-raid - if I go into the nVidia RAID controller and setup the mirroring between the two disks before I even restore the files to the new disk, will both drives be mirrored? However, I do think that I'd probably have to have dmraid installed to check the integrity of the array. So, I'm just a bit lost on this subject. I definitely do not want to start this server over from scratch - so curious to know if anyone has any guidance on simply making a mirrored array after the install procedure, what kind of Grub changes will be needed (because of the previous resource is busy message), and whether installing dmraid is even a requirement.
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Mar 28, 2010
I have an MSI 845E Max Motherboard. I just purchased the computer USED. I have no manual and from all accounts of the online manual, this MB is doing the impossible.Connected to this MB are 2 WD 60GB hard drives. Bother are recognized in the bios. When booting from the live CD, and running the disk utility I can plainly see that there are the 2 drives and one striped array (using both of those drives).There is no settings in BIOS for any array. If I remove 1 of the drives, the disk utility sees only 1 drive but still sees an array. I can find no way to eliminate, recreate, oe manipulate this array in any way.To make matters worse, I attempted to install an older FREEBSD, using it it saw both drives (no raid). Using their Disk utility I re-partitioned both drives and continued the install. Unfortunately the version I had was an older one and it could not complete the FTP install (And I would rather have Ubuntu anyways). Though through this action I believe that I have destroyed the integetery of the raid and if it is to be used it needs to be fixed.So.. how do I fix something that my BIOS is not supposed to be capable of doing? Has anyone else experienced this issue.
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Jan 29, 2010
I'm trying to mount an existing SATA RAID 10 set on a Gigabyte EX58-DS4 (ICH10R "fake" RAID). dmraid is giving me the following:
Code:
root@CyberShadow:/home/vladimir# dmraid -b
/dev/sde: 1465149168 total, "3QK0782F"
[code]....
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Apr 22, 2011
I'm pretty new to FakeRAID vs JBOD in a software RAID, and could use some help/advice. I recently installed 11.4 on a brand new server system that I pieced together, using Intel RAID ICH10r on an ASUS P8P67 Evo board with 2500K Sandy Bridge CPU. I have two RAIDs setup, one RAID-1 mirror for the system drive and /home, and the other consists of four drives in RAID-5 for a /data mount.
Installing 11.4 seemed a bit problematic. I ran into this problem: [URL]... I magically got around it by installing from the live KDE version with all updates downloaded before the install. When prompted, I specified I would like to use mdadm (it asked me), however it proceeded to setup a dmraid. I suspect this is because I have fake raid enabled via the bios. Am I correct in this? Or should I still be able to use mdadm with bios raid setup?
Anyways, to make a long story short, I now have the server mostly running with dmraid installed vice mdadm. I have read many stories online that seem to indicate that dmraid is unreliable versus mdadm, especially when used with newer SATA drives like I happen to be using. Is it worth re-installing the OS with the drives in JBOD and then having mdadm configure a linux software raid? Are their massive implications one way or another on if I do or do not install mdadm or keep dmraid?
Finally, what could I use to monitor the health and status of a dmraid? mdadm seems to have it's own monitoring associated with it when I was glazing over the man pages.
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Apr 1, 2011
I had Ubuntu 8.04 installed on server#1 and moved it to server#2. Everything works fine, including the changing of eth2/3 back to eth0/1. I was wondering if it's possible to use the nvidia onboard raid and make a raid 1 with this OS not getting wiped out. It's a bios level cheesy raid and it warns that it's erasing the data (which is didn't erase), but wont boot anyway. I'm assuming it's probably best to just create a software raid in the working OS with a fresh 2nd drive.
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Apr 2, 2011
After uprading to 11.04 b1 i cannot activate my softraid. It still works if i boot 10.10 live CD
root@bisley:/home/goblin# dmraid -ay
RAID set "pdc_dhifadccdc" was not activated
root@bisley:/home/goblin# dmraid -s
*** Set
[code].....
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Sep 21, 2010
I have a Dell Inspiron 530 with onboard ICH9R RAID support. I have successfully used this with Fedora 9 in a striped configuration.Upon moving to Fedora 13 (fresh/clean install from scratch), I've noticed that it is no longer using dmraid. It now appears to be using mdadm. Additionally, I need to select load special drivers (or something close to that) during the install to have it find my array - which I've never had to do before with F9. While the install appears to work ok and then subsequently run, my array is reporting differences .. presumably because it is trying to manage what mdadm is also trying to manage. More importantly, I can no longer take a full image and successfully restore it as I could with the dmraid F9 install. Is there anyway to force F13 to use the dmraid it successfully used previously?
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Aug 9, 2010
My motherboard has a BIOS feature to support RAID1 for two disks. I know it's FakeRAID but that's what Windows can work with. I've read that Linux's built in softraid mdadm is better so I'd prefer to use that for Linux's own filesystems. Can I enable FakeRAID in the BIOS without it affecting Linux in any way? Is it possible for Ubuntu to read and/or write to the NTFS partition that's raided with the fakeraid?
Also, if running mdadm in RAID 1 how much risk is there of losing data if the computer crashes? Is e2fsck able to repair a filesystem on a RAID 1 setup?
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Jul 31, 2011
I wanted to install Ubuntu 11.04 on my pc (dual boot with windows xp which is already installed on one disk).
I have a Asus P5K pro (motherboard) which has a integrated raid controller and i have two 500 GB hard disks.
On BIOS raid is disabled. On Windows i see 2 different disks (correctly)..
When i try to install Ubuntu, on the disk/partition stagei only see /dev/mapper/xxxxxx which should be the raid (i could be wrong). I tried booting inserting the nodmraid option but if i do i cannot see any disk.
what can i do to solve this?
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Oct 11, 2010
I've googled my problem but I'm not sure I can find an answer in layman's terms. So here's my noob, simple question, please answer it in semi-noob-friendly terms I've been trying to install ubuntu for a while on my desktop pc. I gave it another go with 10.10 but I always have the same problem:
I've got two raid sets connected to an ich10r chip and they work fine in windows (2 samsung 1to + 2 raptors 75gb). Upon installation, dmraid only sets up the first raid set (Samsung array) but not the second one (Clean raptors intended for ubuntu). I don't have any other installation option, all my sata connectors are unavailable. So, is there a manual install solution? Can I force dmraid to mount the second raid set and not the first one? I think I read somewhere that this was a dmraid bug, but I can't find it anymore.
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Jan 19, 2010
I continue to have issues installing any of the newer version of Ubuntu on my ICH9 FAKERAID. I read that the GRUB2 issue with FAKERAID was solved shortly after Karmic was released. Did this somehow not get added to the Alpha 1 and Alpha 2 of Lucid? I would love to have Ubuntu installed on my main rig, but I do not want to fuss around with it forever...
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Aug 12, 2010
I have 2 750GB harddrives with multiple NTFS and ext3 partitions and have just added two empty 1.5TB drives (with WD Advanced Format Technology) to the computer. I have several external drives of various capacities for temporary data storage. My final objective is to have two mirrored RAID arrays that I can access with both Ubuntu 10.04 and Windows Vista (which I still need for applications that aren't supported by WINE), and I'm trying to find out how to do this.
At the moment, the 1.5TB disks are mirrored in the BIOS settings, and I was able to add a blank NTFS partition to the array using GParted. However, I am now unable to mount any of my partitions (other than the Ubuntu one) and cannot use GParted to copy a partition to the RAID array (I get a generic resource in use message, but I have no other applications open and am opening GParted after a fresh boot).
My Ubuntu install is heavily customized, so I would prefer not to reinstall it if at all possible. If it matters, the OS was not installed as 10.04, but was updated incrementally over time, starting at Hardy Heron. I initially did an apt-get install of dmraid and kpartx after reading [URL]
For some reason, my 750GB drives are recognized as belonging to a broken RAID array even though they are not set up that way in BIOS.
HD configuration:
sda: (I cannot mount any of these partitions )
1: ext3 (Debian Installation)
2: ntfs (Vista Installation)
3: ntfs (Data)
[Code].....
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Apr 1, 2011
I have a software raid array (in this test case a mirrored set of two 500GB volumes) and I want to move them to another OS installation on the same hardware. (This is testing in preparation for a physical move two arrays onto a single server.) I had the array up and working (surviving reboots), wrote a test backup onto it in a folder.
Shut the machine down, re-installed ubuntu, got it up and running, then installed mdadm, rebooted with the array powered up and ran mdadm --detail --scan , expecting to see mdadm at least find the parts of the array. Instead, I get nothing. I even added -vv to get more verbose output. de nada.
[Code]...
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May 24, 2011
I'm looking to shrink my windows partition on a raid0 array and create a mdadm ubuntu partition using raid0. Is this possible? can I just ignore the /dev/mapper device and use the standard /dev/sdx devices?
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Dec 3, 2010
I have a CentOS 5 production server with multiple OS-managed RAID-1 sets. I'd like to add a new mirrored set and move the /var partition to the new drives. On a non-RAID system I would boot from the install CD to edit fstab and copy the existing files to the new drive, but I'm pretty sure booting off the install CD does not recognize my RAID setup.
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Nov 26, 2010
I have installed Ubuntu on my m1530 since 8.04 and currently dual boot Win7 and 10.10. I would like to dual boot on my PC, but I have run into a problem. I am not a pro at Ubuntu, but this problem I can not solve by reading forums like I have in the past.
I realize this is a common problem, but I have noticed people having success.
I have a M4A87TD EVO MB with two Seagate drives in Raid 0. (The raid controller is a SB850 on that MB) I use the raid utility to create the raid drive that Windows7x64 uses. I have 2 partitions and 1 unused space. Partition 1 is Windows, partition 2 is for media, and the remaining unused space is for Ubuntu.
I am running ubuntu-10.10-desktop-amd64 off a Cruzer 16GB flash drive that was installed via Universal-USB-Installer-1.8.1.4.
My problem like so many others is that when I load into Ubuntu, gparted detects two separate hard drives instead of the raid. I read that this is because kpartx is not installed on 10.10. I then went in LiveCD mode and downloaded kpartx from Synaptic Manager. Gparted still reported two drives. I opened terminal and run a few commands with kpartx. I received an error. (Forgive me I didn't write it down, but I believe it said something about a communication error. I will try again later and see.)
Currently I am reflashing the Cruzer with a persistence of 4GB. I am not familiar with this process, but I understand that my LiveCD boot will save information I download to it. I decided to try this method because I was going to install kpartx and reboot to see if this made a difference.
I am looking for any suggestions on a different method or perhaps someone to tell me that the raid controller or some hardware isn't supported. I did install ubuntu-10.10-alternate-amd64 on my flash drive, but fail to get past detecting my CD-ROM drive since it's not plugged in. If this method is viable, I will plug it in. I also watched the ..... video were a guy creates Raid 0 with the alternated CD, but it wasn't a dual boot and didn't use a raid controller from a MB.
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Feb 1, 2011
Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.
Now the array is (logically) no longer able to start:
mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]
I was able to examine the disks though:
Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....
Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.
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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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Mar 26, 2010
how do i install a linux distro that doesnt natively support Intel fakeraid, using dmraid and a livedisk. the raid is already setup, its just that backtrack cant find it because it doesnt have the right software.
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May 3, 2010
Building an Ubuntu file server that would be running software RAID5. While I think I have most of it figured out, I'm still a bit fuzzy about this: what happens if I trash or otherwise have to re-install my OS (because I decide to upgrade to a newer version, switch distros, or whatever)? Would the new OS be able to "see" that there was a RAID5 array on the disks and make use of it? Or would I for sure lose all of the data on the array?
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May 29, 2010
I am unable to mount my fakeRAID, raid 0 array in ubuntu 10.04.
My motherboard is a Gigabyte GA-MA74GM-S2H with BIOS version F4b. code...
It's the two 1 TB samsung hard drives that is in the raid 0 array.
Why am i unable to mount the 1.8 TB ntfs partition?
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Jul 19, 2010
I have installed Ubuntu 9.10 (64 bit) as a dual-boot setup (along with Win 7) on my desktop. I can't emphasize how much faster Ubuntu loads when compared with Windows. There is only one problem though, I cannot figure out how to use my existing FakeRaid array (two 2TB hdds setup as RAID 1 - mirroring) to work with Ubuntu. I am NOT trying to install Ubuntu onto a raid array (I have Win 7 mounted on a separate boot drive , 4 hdds altogether, two for each OS and two for the RAID array). The raid array works fine in Windows and it's an Intel Raid Controller. How can I do the same for Ubuntu without losing any data? Is this possible?
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Jan 15, 2011
I have just installed Ubuntu 10.10 server on and old pc to use it as a backup server for my and my kids pc's.The pc I use for the Ubuntu server has two sata disks on a fasttrak 378 controller, fakeraid as I have learned, and a single pata disk. I have installed ubuntu on the single pata disk and was planing to use the fakeraid as the samba share.
df -> Code: /dev/mapper/ubuntu-root
75287688 985120 70478136 2% /
none 1024032 248 1023784 1% /dev
none 1030124 0 1030124 0% /dev/shm
[code]....
How do I mount this fakeraid with a mirror setup? should I mount one of the disks, and if so which?
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Jan 3, 2010
I have a truecrypt partition on an nvidia fakeraid raid0.ore there is no data recognizeable to ubuntu's kernel on startup and I think it is causing a big slowdown for me every time I boot up, which takes over ten minutes every time. Attached are bootchart results.What I would like to do is know how to remove dmraid from the startup process. I can't find any scripts in /etc/rc*.d and all of the information I can find on these forums is about how to enable dmraid on boot, not disable it.
Manually using dmraid takes nearly no time at all, which is what I did before this kernel upgrade since ubuntu didn't put dmraid in the startup process. I can't see why it takes dmraid ten minutes to detect raid devices now! The only clue I can see is that in the startup process with the splash screen disabled it talks about examining inodes on both drives in the array and then goes on to spit out stuff about raid 0, raid1, raid2, raid3, raid4 and on and on so it seems like it is loading raid arrays that don't exist and never have.If any bootchart gurus have any advice, please feel free to throw me a bone, I am in fear of restarting!edit: for some reason ubuntuforums shrank my images so that they are unreadable by anybody except those with a large projector.
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Nov 13, 2010
1) Use INSSERV to start DMRAID
2) Use MKINITRD to create a new INITRD file which loads the DMRAID module.
Neither solution showed any detail of how to accomplish this, and which files to edit or what order I should use to tackle either. With the second solution, I have another SUSE 11.2 installation on another hard drive. Would it be ok to boot into that and create a new INITRD with DMRAID activated, or would it be better to break the RAID-set boot into one of the drives and create INITRD for that RAID 1 system, then recreate the RAID-set? The only issue I would see is that fstab, device mapper and grub would need the new pdc_xxxxxxxxxx value, which can be changed from the second installation.
My system is:
Asus M4A78T-E with fakeraid SB750 controller
AMD Black Edition - AMD Phenom II X4 3.4 GHz Processor
2 x Samsung 1TB drives
Suse 11.2
I have Windows XP on another hard drive purely for overclocking and syncing the 1TB drives, but I can't actually boot into the SUSE system until this issue is sorted out.
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Jul 6, 2011
I got gigabyte chipset with an raid support. Currently I have 2 hdd's running in raid 1. When I was first installing ubuntu 11.04 server my fakeraid was detected, and I assigned a name for it in the initial installer and it was auto-mounted (working 100%) ever since.
However I was forced to reinstall my ubuntu server, and this part was somehow skipped in the installer.
HDD can still be seen in /dev/mapper
I can see
control
jmicron_GRAID -> ../dm-0
jmicron_GRAID1 -> ../dm-1
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Aug 1, 2011
I'm using Ubuntu Server 11.04
I have a HP Microserver which uses what I thought was a hardware RAID. It now turns out that it is fakeRAID.
I'm moving from Windows 2008 so currently I have 2x2TB disks in a RAID1 and formatted to NTFS. The RAID was working fine on Windows but it doesn't seem to work on Ubuntu. I have over 1.3TB of data currently on the RAID so I cannot format and start again. I need to find some way of getting Ubuntu to mount this RAID without having to format and create a software raid.
I'm unsure why it presents itself to Ubuntu as two separate disks as the RAID was setup on the RAID Array controller before it starts to load the operating system. Windows sees the RAID as a single disk and not two separate disks (although it can if I use a disk manager).
After some digging I have found out that the RAID format is PDC because Ubuntu can see the two disks and knows that they should be in a RAID but does not want to activate them. I don't want to go any further and experiment with commands until someone responds because I'd rather not risk my data.
Code:
chris@Chris-Server:~$ sudo fdisk -l
Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[Code].....
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