Ubuntu Servers :: Moving Raid System To A New Host?
Aug 3, 2011
A while back I successfully set up a software raid (mdadm) install of ubuntu server on a cheap Compaq machine. I'm pretty sure it's running an nForce 430 chipset. Anyway, I put 3 2TB drives in it and set up two arrays: a small raid1 array for /boot and a raid5 array occupying the rest of the drives.
One point of note here is that the raid1 array never seemed to "take hold": the partition is empty, and the system has been booting entirely from the raid5 array. I'm not sure if this is relevant or not: just throwing it in there in case it is.
Anyway, I recently upgraded my desktop PC, and planned to hand down the Q6600 and DG33TL motherboard from it to the server. I did the hardware upgrade, but now the system will not boot. My question is: why.
Boot fails with the following error message:
"No bootable device -- insert boot disk and press any key"
This to me suggests that it's not even getting to the point of running grub2: the mobo itself just isn't finding anything it considers to be bootable.
I've tried all combinations I can think of of configuring the SATA support in the BIOS (modes include IDE, ACHI and RAID, all in combination with UEFI boot enabled and disabled). The system does detect the three drives: it lists them in the BIOS config screen.
I've booted from an ubuntu rescue USB drive and I'm able to see the drives and even assemble the array. I can mount the LVM partitions therein and do what I'd normally be able to do with them.
Everything *seems* fine: it just can't boot.
Grub2 is something of a mystery to me, so I'm not exactly sure what I need to do to get it booting again, if indeed it is a problem with grub.
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Nov 12, 2010
I am moving some websites from a shared host to a newly configured Xen based VPS with Ubuntu 10.04. A steep learning curve but I am getting there! I have a couple of sites installed on the new server and want to test them out, from what I understand I should be able to edit /etc/hosts on my desktop computer (running Ubuntu 10.04) which should automatically redirect my browser to the new server. But it doesn't seem to work.
This is what I appended to the /etc/hosts file:
12.34.56.78 www.xxxx.com
I thought that this should send any requests for www.xxxx.com to 12.34.56.78? Some googling indicated that the browsers I am using may be using DNS caching, ignoring the hosts file. I've tried clearing the cache with Chromium 7.0.517.44 (64615) and Firefox 3.6.12, and even installed a plugin in Firefox to block DNS caching.
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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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Jan 26, 2010
Everything is software raid using mdadm
3x320GB HDDs in raid 5
1x1.5TB HDDs in raid 1(don't ask)
The above are LVMed to create ~2TB of combined space using reiserFS. I'm not really happy with the performance so I'm moving to XFS while I'm at it.
I FINALLY got around to ordering 2 more 1.5TB HDDs. The end goal is.3x1.5TB HDD in raid 5 formatted to XFS for a total of around ~2.7GB of space.
1. Create raid 5 array using the new 2x1.5TB HDDs.(yes, very pointless at the moment, please continue reading)
2. Copy data from 2TB LVM to the new ~2.7TB raid 5. (will mdadm let me be an idiot? It apparently let me force create a single drive in a raid 1)
3. Move the original 1.5TB over to the new raid 5 to actually provide redundancy.
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Sep 30, 2009
I was recently requested to try and convert a running system to RAID level 1. I did not succeed in this task. However, I am still interested in accomplishing this task in a test environment.What I did was create a RAID device with a device missing e.g.
mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb2
Once the RAID was up and running I created the /etc/mdadm.conf file so that it would activate the RAID device on boot. Once the device was created I copied all the data from the running root filesystem to the /dev/md0 device. The only directory that I didn't copy was the /proc directory. When I rebooted the machine I had a kernel panic and the system couldn't find /dev/root. I would greatly appreciate it if someone could provide some information/tips regarding the problem.
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Apr 9, 2010
I have run Ubuntu in the past and then switched to OpenSUSE several months ago and set up raid 0 on a 500gb hard drive and 700gb hard drive (I went with openSUSE because of the graphical raid setup.)
My whole partition setup looks like this:
500gb Hard Drive:
750gb Hard Drive:
md0 is the two 400gb partitions on each drive for a total of 800gb space on my /home partition ext4 filesystem ( 380gb space used ) md1 is 100gb ext4 / partition.
all raid 0
Now I was wondering if I downloaded the alternate install cd for ubuntu ( as OpenSUSE has crashed for the second time because of bad updates ( starts, but gets to terminal only ) ) would I be able to keep my raid 0 home partition and wipe the rest of the each drive and setting up Ubuntu keeping all of my files and settings intact, just to install my programs I need all while keeping my old settings ( such as firefox bookmarks, virtual box utilities etc. ) intact.
From what I know it's possible, but I don't know much about the Ubuntu Alternate install disk ( as I have been dealing with dependancy hell on OpenSUSE ) but in OpenSUSE it wont let me keep the old raid setup ( md0 ) Im guessing it is possible to set up the home directory on a different hard drive and then going back into the live cd, editing the fstab, and switching it to md0, if this is even possible, or would I need to configure the driver on that system before I did that Oh and I forgot to mention that I've only been running 64bit operating systems.
System Specs: AMD Dual core at 2.8ghz ( overclocked, stable, cpu ran at full bore for a day. only reaching 120f) Nvidia 9600 gso 368mb ram, 4gb ram at 800mhz
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Jan 4, 2011
I have a Linux installation that currently uses a 40GB hard disk. It is partitioned as follows:
Code:
The disk has recently started to make a lot of noise, so I'd like to replace it before I lose data.
I have a pair of identical 160GB blank hard disks that I would like to use as a software raid1 array (The existing 30-odd GB root partition would be resized to fill the new disks).
How I could get the data on to the new hardware without losing anything?
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Mar 25, 2011
I'm having trouble with Ubuntu 10.10 and stable device names. When I installed Ubuntu, the root drive was the only one in the machine; it obviously got /dev/sda.
After the base installation, I installed three additional 2TB drives to make RAID-5 array. Ubuntu renamed the root drive to /dev/sdd. While annoying I lived with it.
After creating a single partition set to "Linux raid autodetect" on each drive, I created the RAID-5 array:
Code:
All was going well until a reboot. When rebooting Ubuntu decided to make the root drive /dev/sda this time and now mdadm --detail /dev/md0 reports:
Code:
How to fix the array and make the device names stable?
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Jan 6, 2010
Here is my system: I have dell poweredge 1950 PERC 6 with 300 GB raid system. It has two disks of each 300GB RAID mirrored system. I have few applications and data that reached around 280GB. As you know, poweredge 1950 we can have only two disk.
They are not mission critical. Hence, I wanted to remove the raid system and use as a non-raid system. By doing it, The applications and data can grow upto 600GB. I do not want to loose the data and setup. I am not so clear about RAID system and its conversion.
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Sep 29, 2010
I had Ubuntu 10.04 on a machine with SilImage and 3Ware raid controllers (Fakeraid) working in it just fine. Built a new machine with 10.04 as well then moved the whole array across (Cable for cable etc. - NO changes). The new machine 'sees' the controller and 2 drives per card in Disk Utility - all looks good, BUT the array does not seem to work as an array. Obviously the drives are full.
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Oct 27, 2009
If you want a full run down as to WHY I want to do this, read here: webhostingtalk.com/showthread.php?t=899909Basically, my ISP could not get my server running stable on a simple raid 1 (or raid 5) so what it came down to was having them install my system on a single disk. I don't exactly like this, main reason being, if the system (or HDD) crashes, I'll end up with another several hours of down time..
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Jun 29, 2011
migrate an installed Ubuntu system from a software raid to a hardware raid on the same machine? how would you go about doing so?
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Sep 25, 2010
My problem is that I need to move a moderately complex system from an old system to a new system. The old system is a core 2 duo running on an asus p5k-se (p35 chipset) M/B, Nvidia 8500 gt, 3 x sata II hard disks, 1 x sata dvd, 1 x ide hd, 4GB ram. It runs opensuse 11.1 kde 4 as a desktop system + samba server, apache server, database server + other non-opensuse software. In addition some of the opensuse software is not the default 11.1 versions as later versions were required. The nvidia driver is from the nvidia repo. There are several file systems, some under LVM.
The new system will be a core5 760, asus p7p55d-e M/b (p55 chipset), nvidia 240, 3 x sata II HD, 1 x sata dvd, 4GB ram and possibly 1 x ide HD. This M/B also includes USB 3 & sata III. I have no USB 3 devices but this may eventually change. I have no plans for sata III and believe that it may be better to attach any sata III SSD to the sata II bus.
What I would like to do is to move the hard disks from old system to the new system. What I would like to know is, if the system is left at 11.1, is the system likely to work with the new hardware. If the answer is no, if the system was upgraded to 11.3, would the transfer of the hard disks then work? In order to upgrade from 11.1 to 11.3 using the DVD i believe I should get rid of all non-default repos. I assume that I should also get rid of anything that was installed from them, e.g. the nvidia driver and any software versions installed manually outside RPM. Also is there any default 11.1 software that should be removed either before or after the upgrade to 11.3
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Jun 12, 2010
I have two 1TB hard drives in a RAID 1 (mirroring) array. I would like to add a third 1TB drive and create a RAID 5 with the 3 drives for a 2TB system. I have ubuntu installed on a separate drive. Is it possible to convert my RAID 1 system to a RAID 5 without losing the data? Is there a better solution?
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Mar 24, 2011
I have a box that doesn't have a Raid controller or a software raid running currently. I would like to make it a RAID 1. Since it seems there isn't any IDE RAID controllers hardly around, I have another HD that is the exact model as the drive currently in the box running CentOS. Can I some how add the second drive and get the box to mirror from here own out? The box gets really hot and I want to be ready for a HD failure.
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Feb 25, 2010
I have this 7.10 Ubuntu server that I'm trying to move inside a VM on my ESXi server. I use the VMware Conversion tool and everythings goes well until I try to boot it from inside the VM, the network isn't detected. Now I understand that the drivers may not be working, I'm not an expert here. Also, since this is a 7.10 install I don't have access to the Gutsy repositories anymore.
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Aug 12, 2010
Quick searches did not bring forth any standard solution.
I have installed Ubuntu Server 10 (x64) using LVM with two disks (this is a Virtual Machine on VMWare ESXi4)
During install I selected only disk 1, and LVM guided Installation Added LAMP and SSH
Server gives only a text mode configuration, great if you are a linux guru, but I am not so it took a bit to find a stripped down GUI. None could be found but I did the following:
apt-get install xorg gdm gnome-core (minimal Gnome install)
apt-get install gnome-system-tools (users and *****s, time)
apt-get install gnome-network-admin (network config)
apt-get install update-notifier (updates)
[Code].....
I have created a similar system with Ubuntu, now I wish to move the var/www directory to sda1, and the databases from MySQL.
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Mar 10, 2011
I'm moving my site to a new VPS and need to learn how to move the files from my current server to the new one. I'd rather not download everything to my computer and then re-upload everything... seems like a lot of wasted time. There has to be a way to copy between the two servers, but how? I have heard someone mention rsync... is that a program I could use? If so, how?
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Dec 30, 2010
im using ubuntu server 64 bit on intel atom410D. when im using my SATA DRIVE as AHCI mode while i moving 4 GB files from one partition to another my server is getting so slow that it will take me to login on ssh 2 minutes. so i have seen a thing or two about a bug on it. i changed the AHCI mode to IDE mode and now it seems to work better.
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Jan 19, 2011
I have (had) Debian Testing running on a 250GB IDE hard drive, partitioned normally.
I also have 4x 1TB drives in a raid 5 using mdadm, and 2x 500GB drives in a raid 1 also with mdadm.
I put the two arrays in lvm using:
I then used "lvcreate" to make storage/backup 300GB, and the rest went to storage/media (approx. 2TB usable). I put an xfs filesystem on both and mounted them.
All was working fine until the system drive shorted out and died on me this morning. As far as I can tell, all my other drives and everything else is fine. I do a daily rsnapshot of the filesystem, which of course is residing on storage/backup (stupid, I know). So I have full backups of everything, but I'll have to put a new hard drive in and reinstall Debian before I can restore everything.
I've reinstalled before and simply reassembled mdadm arrays and remounted them before with no problems, but this is the first time I've used lvm, so I'm not sure what I have to do to restore everything. Is it as simple as reinstalling the system then doing a:
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Jan 18, 2010
i have an fedora system, with no separate /boot partition. there is only one big / partition. I think this is the reason that preupgrade does not work. So I decided to build an own /boot partition. Could anyone give me a hint how I could do this easily? My idea is:
get a second hard disc and format this with 2 partitions (/boot and /)dd the partition1 to the new one.
is this a nice idea? my only problem is that my second hard disc is smaller then the current one. but the current one is not filled up total. but I can not dd to a smaller partition or? is it possible to boot with an live-cd an copy the partition with the cp command?
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Jan 7, 2010
I have an external hard drive that needs to be readable and writable between MacOSX, Ubuntu, and Windows. I also need to work with files over 4gb in size (which can't be done with Fat32, which happens to work with all 3 OS's) I tried MacOS journaled, that didnt work. Before I start reformatting and doing a bunch of guess and check, I wanted to know if the answer was known.
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Nov 11, 2009
I've a pc running Centos 5.4 with an uniq external hard disk hooked by USB (no internal drive). I'd like to hook it through e-sata to get performance improvment. So I am using a sata->e-sata connector to plug the disk.The disk is well detected by the bios, and Centos begin to boot but when it wants to mount the volume groups I've a kernel panic.VG and LV names are detected, but the system says it can't find them (there is a /dev/root not found error message)If I boot the system through a live cd I can mount and access VG/LV without problem any hint to get the system up and running through sata ?
grub.conf:
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
[code]...
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Jan 1, 2010
Currently, my disk layout is: 20GB(windows-ntfs) / 250GB data-ext4 / 20GB ubuntu-ext4 / 4gb swap
Since I no longer use windows, I want to move ubuntu to the first place.
What do I need to change in configuration files, grub and anywhere else?
Shoudl I keep swap where it is or move it, too?
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Oct 14, 2010
So, I followed the verbatim instructions from Alsa to OSS here:[url]
I did this in hopes of getting sound in Fusion 3.63 to work.
Now, when I try to go to System > Preferences > Sound, it just says "Waiting for sound system to respond" and just hangs there until I hit cancel.
Also, when I plug-in my headphones, it plays through the headphones AND the system speakers.
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Mar 12, 2011
I've read many of the postings on ICH10R and grub but none seem to give me the info I need. Here's the situation: I've got an existing server on which I was running my RAID1 pair boot/root drive on an LSI based RAID chip; however there are system design issues I won't bore you with that mean I need to shift this RAID pair to the fakeraid (which happens to most reliably come up sda, etc). So far I've been able to configure the fakeraid pair as 'Adaptec' and build the RAID1 mirror with new drives; it shows up just fine in the BIOS where I want it.
Using a pre-prepared 'rescue' disk with lots of space, I dd'd the partitions from the old RAID device; then I rewired things, rebooted, fired up dmraid -ay and got the /dev/mapper/ddf1_SYS device. Using cfdisk, I set up three extended partitions to match the ones on the old RAID; mounted them; loopback mounted the images of the old partitions; then used rsync -aHAX to dup the system and home to the new RAID1 partitions. I then edited the /etc/fstab to change the UUID's; likewise the grub/menu.list (This is an older system that does not have the horror that is grub2 installed) I've taken a look at the existing initrd and believe it is all set up to deal with dmraid at boot. So that leaves only the grub install. Paranoid that I am, I tried to deal with this:
dmraid -ay
mount /dev/mapper/ddf1_SYS5 /newsys
cd /newsys
[code]....
and I get messages about 'does not have any corresponding BIOS drive'. I tried editing grub/device.conf, tried --recheck and any thing else I could think of, to no avail. I have not tried dd'ing an mbr to sector 0 yet as I am not really sure whether that will kill info set up by the fakeraid in the BIOS. I might also add that the two constituent drives show up as /dev/sda and /dev/sdb and trying to use either of those directly results in the same error messages from grub. Obviously this sort of thing is in the category of 'kids don't try this at home', but I have more than once manually put a unix disk together one file at a time, so much of the magic is not new to me.
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Dec 30, 2015
I want to move my old system to a new drive. Currently I have Debian installed with following configuration:
I have an encrypted system where everything is encrypted except /boot. Currently I've /boot and / installed on a 16 GB mSata SSD and /home on a regulard HDD. I've got a 500GB SSD for Christmas and want to move the whole system to the new SSD.
I just wanted to ask if I've got the process required to to this down:
1. backup root-directory (/) without and /boot /home using tar keeping file-permissions and owners to ext. hard drive
2. backup /boot and /home separately using the same method
2. replace HDD with SSD remove mSATA SDD.
3. boot via live-usb
4. create appropriate volume groups, partitions, setup encryption etc.
5. extract backups to appropriate partitions
6. chroot to old /.
7. edit fstab
8. reinstall grub
9. create new init ram img.
I'm pretty sure I've got steps 1.-6. down but I'm very shaky on what to do next.
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Dec 29, 2009
I have Windows XP and OpenSuSE 11.1 installed on my laptop. I have recently removed the recovery partition provided by the laptop manufacturer (HP) to free up some space and ideally I would like to be able to add the free space to the existing Windows partition.The current partition set up is as follows:
Code:
Disk size 93Gb, P = Primary, L = Logical, U = Unallocated
P Windows XP 36Gb /dev/sda1 /windows
[code]...
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Feb 10, 2011
I need help writing a script that will copy everything from tape to system directory. I have a Linux box with 3 TB of Hardware space. I am using the following commands
1) mt /dev/st0 rewind
2) tar xvf /dev/st0
3) tar xvf /dev/st0 fsf 1 (Using this to move to the next segment of the tape) and then
4) tar -xvf/dev/st0
I keep repeating steps 3 and 4.
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Apr 6, 2011
I currently know how to run a traffic report on the whole host. How can I setup a cron job to run the report on a paticular virtual host and move it to the directory where it can be view over the net?
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