Fedora :: RAID 1 - How To Create New Array Without Losing Data
Jan 1, 2010
I have a software RAID array using mdraid that consists of two 1.5TB drives that I use for storage, the array is mounted at /Storage. I am running out of space in the array so I ordered two more 1.5TB drives to create a 4 drive RAID 1+0 array which will be 3TB big. My question is how do I create the new array and not lose any data?
The drives and partitions are sdc1, sdd1, and soon to be sde1, sdf1. I currently have 4 RAID arrays (md0,md1,md2,md3). I think I can create the RAID 1+0 array with the two new drives, copy the data from my current array to the new one, remove the old array, then add the two original drives to the new array. But I wanted to ask on here first to make sure my data doesn't go poof.
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Jul 27, 2011
Right now I have a 320GB system drive and 3TB data drive. I want to add two more 3TB drives and do a software RAID5 3x3TB. Is that possible without losing the data that is already on the data drive?Just want to make sure before I bought the 2 two drives. Not looking for instructions on how to do it,but if you want to include some that would be great too Just making sure it will work.
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Apr 7, 2010
I have a 160gb hard drive with no partitions. Ubuntu runs on the entire disc. I want to cut off 60gb from my file system as a storage drive without losing the data that i already have on it.
I don't want to reinstall Ubuntu and cannot afford to lose all my data. Is it possible to do so, without having to reinstall the OS.
I downloaded Gparted, whats next?
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Jul 18, 2009
how can I create RAID 1+0 using two drives (one is with data and second one is new). Is it possible to synchronize data drive with empty drive and create RAID 1+0 ?
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Dec 11, 2010
I rebuilt a server and am now trying to recover my large data arrays. The server was ubuntu 10.04lts before. I decided to rebuild it with CentOS simply because I am more familiar with it. I had 2 raid-5 arrays on the old server:4 x 1tb -> md0 5 x 2tb -> md1 The newly built server does not know about these arrays yet. How can I reassemble the arrays without loosing my data? I know the data can still be accessed because booting the server with a live-cd mounts and shows the arrays just fine. Should I boot with a live cd and copy the mdadm config file?
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Mar 10, 2010
I have a raid 1 array which I did setup on a Centos box. I can configure the array fine the problem is every time is restart my machine I can no longer see the array and have to go create it all over again. I tried doing a few searches on it but have came up with nothing so far.
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Nov 16, 2009
mdadm --create /dev/md1 --level=1 --raid-disks=2 missing /dev/sdb1and I getmd1: raid array is not clean -- starting background reconstructionWhy is it not clean?Should I be worried?The HD is not new it has been used in before in a raid array but has beenrepartitionated.
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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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Sep 27, 2010
I have a NETGEAR ReadyNAS NV+ with four 1TB drives in a RAID-5 array. This is our primary file storage. This has previously been backed up to a hardware RAID-0 array directly attached to our Windows server. The capacity of this backup array is no longer sufficient. So the plan was, take a bunch of 200GB to 320GB drives (And a 750) I had kicking around, chuck them in a couple of old SCSI drive enclosures I have collecting dust, attach them via IDA/SATA-to-USB adaptors to a USB hub, attach that to the server, create a JBOD array spanning the disks, and back up the NAS to that. Performance is not an issue as this is just to be used for backup, with the idea being as near to zero cost as possible (Spend so far = NZ$100�ish).
The first hurdle I struck was Windows not supporting Dynamic Disks on USB drives (Required to create a spanned volume). At first I resisted using another machine (i.e. a machine running Ubuntu) as I didn't want to dedicate a piece of hardware to backing up the NAS. I then decided it would be acceptable to do this via a VM, which is what I've done.So I have 10.04 running under VMWare Server 2.0.2 under Windows Server 2008 R2. The disks are all presented to the VM. I wasn't sure if I was going to end up creating the array under LVM or something else, but I noticed Disk Utility has an option to create an array, so I tried that. When I add two 250GB drives, the array size is 500GB. When I then add a 160GB drive, the array size drops to 480GB. Huh? If I keep adding disks (Regardless of order) the final array size comes out at 1.8 TB, as per the attached screenshot. Now with the following drives, I expected something more like:
160 + 250 + 250+ 750 + 250 +200 + 200 + 250 + 320 + 250 + 320 = 3.2TB
Am I missing something or making a false assumption somewhere?
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Nov 24, 2010
I 've some problems with my current version 11 that probably has been fixed in the last version (14). I've updated other non-critical systems through the yum services but from 13 to 14. I've a productive workstation working on ver.11. Is there any possibility to update through yum or other methods through without risks of losses data information?... It's really complicated to backing up Mysql databases, web services and other hundreds things installed. I know, it's convenient carry out a backup but is it a higher risk to dump from 11 to 14 trying to keeping the information inside?
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Oct 30, 2010
I installed RC1, and never touched the disks that were raided previously, and the attached image is what i see for my raid array that was previously working fine.
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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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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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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):
Code:
- 250GB system drive
250MB/dev/sdh1/bootext3
lvm partition rest of driveVolGroup_System
10240VolGroup_System-LogVol_root/ext4
[code]....
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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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":
[Code]...
and the partition in it was not available as device special file in /dev:
[Code]...
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Dec 7, 2010
I have a Dell workstation, 2 HDD, HDD 1 setuped Red Hat 5.3 with LVM, and that HDD 2 is empty, not install RAID 1. And, I want to setup RAID 1 (hardware RAID)...but, have a problem. I don't want to lost data on HDD 1 when I setup raid, I try ghost or backup it, but when I restore, it error because LVM is setup on that.
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Sep 19, 2010
I currently have 10.10 32 install but would like to use the 64 bit. Is there anyway for me to update without losing my data? My home directory isn't on a separate partition.
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Aug 25, 2011
I need to reinstall OpenSUSE 11.4 with KDE Desktop on my HP Pavilion Desktop and I was wondering if it is possible to do so without losing my data, and no backups? I can't back up my data for reasons I'm not going to go into so I need to know if I'll lose my files...there isn't anything truly important...just stuff that'd be mildly irritating to lose...
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Mar 20, 2010
Currently i am using Ubuntu 9.04(Jaunty),i have downloaded iso image of Ubuntu 9.10 and i have burned it in a CD..So how to upgrade my ubuntu version to 9.10 without losing existing data.
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Apr 7, 2010
How can I do partition of my drive without losing the data?
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May 26, 2010
because what i was looking for was complicated, i am going to edit post
I have laptop with ubuntu on it. I have one ext3 partition with ~220GB.
I want to delete ubuntu and create two ntfs partitions (50+170GB) so i can install windows 7 later.
how to do that using GParted Live CD?
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Jun 24, 2010
I am completely ubuntu right now, and I need to create a partition for XP without losing all the work I have on ubuntu. How can I shrink ubuntu's partition to make a 15 gb partition for XP without losing data?According to Gparted:
sda = ubuntu
sda2 = swap
sda3 = extended
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Feb 9, 2011
I have Ubuntu 10.10 installed on my computer (no other OS) and it wont boot up. I don't want to lose the files in my documents. I tried accessing them using a live CD and then copying them from the harddrive (home folder then 'richard' then documents then tried to open the folder but I dont have permission to and there seems to be no way of changing this.
The files are definitely on my harddrive but I dont seem to have a way of accessing them!
Is there anyway of either accessing them and copying them to a usb etc or repairing my installation of ubuntu without erasing the files in my documents? Opening in recovery mode etc wont work.
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Jun 17, 2010
When I tried to install fedora13, f13's installer kept seeing my hard drivesas a "BIOS RAID set (mirrorred)".Ubuntu10.04's installer had the same problem withmy drives but that installer was less informative than f13's installer. U10.04's installerjust stalled in the first screen, the one with the word Ubuntu above five dots, giving no hintas to what it didn't like.My pc came from Dell with 2 identical SATA hard drives in a RAID level one array.I changed CMOS settings from "RAID ON" to "ON" for each hard drive. That did not dismantle the RAID configuration, at least notin a way that satisfied f13's installer.
I reinstalled xp and tried to install f13 after a minimal xp installation.f13's installer detected "BIOS RAID metadata."What is it that f13's installer is detecting?I thought this might have something to do with nVidia's nForce4 Serial ATA RAID controllers. These are installed when you install the version xp that came with my system, not like most other drivers which you install after xp.I contacted nVidia but theycouldn't help me with this.Well, it turns out to be Dell's fault. They place this "BIOS RAID metadata"in a special place on each hard drive of a RAID set. It survives even the formatting that accompanies a reinstallation of xp.
If you want to truly dismantle a manufacturer's RAID set, you must use software like "dban" (www.dban.org) to thoughly wipe clean the drives. Download dban, burned it to a cd, then boot that cd. dban's auto??? command didn't work for me but its dod command did the trick. The process took aout seven hours for each of my 160gb hard drives. Hey, i was real impressed by the help i got throughout all the twists and turns that took this problem far away from the original statement Special thanks to Scotty38and to the "Troy Polamalu looking" young man working at Best Buy here in Little Rock, he understands how manufacturer's are shipping their pcs.
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Oct 31, 2010
I've never worked with a software raid before, and I was a little worried about getting the hand of it before actually relying on it. So what I decided to do is to create a raid 5 on my Fedora 12 installation, and then install fedora 14 and see if the raid 5 was still in tact on the OTHER 4 disks that were NOT a part of the OS drive. After installing Fedora 14 I noticed that the raid5 was broken, and I googled for hours and even started a thread here, but could not get it working again.
I decided to start from scratch, and just delete all of the partitions and the raid, and do a new raid5 using 4 disks that are 2tb each. I googled for a long time, and tried using both the cli (mdadm) and the gui (disk utility), but I was not able to successfully get a new raid5 working? I've tried various examples, to no avail. Any link to a difinitive resource on how to setup a raid5? I don't just mean the commands for mdadm, but also the actual disk formatting that's required before setting up a raid, if it's even required. I say thing for 2 reasons:
1) In fedora 12, using disk-utility, I didn't have to format the drives first, or anything else. I just selected 4 drives, said to make them a raid 5, and then formatted them as ext4. But many examples I've seen says that the drives must already be formatted, and you use partition #1 of each drive to setup the raid, whereas when I did it, I didn't have any partitions (they were new drives), and I could format after.
2) One example I've found says to use ext*, whereas another example says to use xfs. I don't feel this matters, and is only a matter of choice/taste, right?
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Jan 18, 2011
I would like to resize my /home ( /dev/sdb6 ) partition - without losing data - to make room to create a swap partition (at the moment, I don't have any swap. Is it dangerous ?) IIRC, it was possible to change partition sizes from the install disk in repair mode (?) But I cannot find that repair mode on the 11.3 install disk. Has it been removed or is it somewhere deeper in the install or update process ?
[Code]....
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Apr 1, 2011
to start: I am a 100% linux virgin. I have yet to boot once. I have a 1TB external HD bought today (), which I formatted to 32GB Fat32 and the rest NTFS. (The 32GB partition is the second in order) I tried installing 11.4 with the full release DVD, and managed to get through the 'partition' part of the setup without raging about losing valuable internal HD data. I changed / to the 32GB partition, and figured a native format was safer: formatted it in setup as Ext4, and installed after ignoring the under 128GB warning (the machine is only a few months old).
The installation seemed to go well. The loadup was unsuccessful. There were plenty of "fails". I was given a command screen with "Login:" and after, "Password:". It seemed to take the Login, however the correct password echoed back a "Login module failed" or something similar. Interestingly, an incorrect password yielded a "Incorrect Login". What I may need to do (?):
1. I did not specify a /home or swap during install
2. ?
3. ?
etc
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Apr 11, 2011
I am facing a severe problem on many Desktop PC's, whenever an employee is working in Gnome-Open-Office.org document (i.e. Wordprocessor, SpreadSheet, or any other Gnome-office application) and due to power outage after restarting, the previously open document either does not open or it shows a recovery dialogue after clicking on recovery button or clicking on cancel in either case document contain nothing (empty). The file size of the document is either 0kb or within few Kbs range.
Any one have any idea about it ? what to do ?? or any other alternative which is already tested in such environment (i.e. electricity failure )? or any options to be turned on/changed?
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May 15, 2011
I would like to move a samba fileserver from ClearOS5 to Ubuntu. It has raid1 (software) and I would like to save one partition from it, md3. The other partitions could be used for Ubuntu. How would I go about this so that I don't erase data from md3 and is it even possible?
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Jan 10, 2010
I have a 300 external usb drive which I have got when using windows and so is using a fat32 filesystem. I have since moved to linux only and am mounting the drive as vfat however I think I may as well convert it to ext4 if possible for (amongst others) performance and security reasons. The problem is I don't have a separate drive which would hold the 250gb of data temporarily whilst I changed the filesystem of the drive so I am hoping there is a way to format as ext4 whilst retaining the files?I know partition magic on windows allowed you to change between filesystems whilst keeping the data but does anything similar (and free! ) exist for linux?
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