General :: Create A RAID1 (mirroring Only) Array With 3 Live Drives?

Jun 16, 2010

I'm not entirely a newbie, but this seems like such a simple question I'm not sure where else to ask it. I checked through the various HOWTOs and searched already and didn't find a clear answer, and I want to know for sure before we start investing in hardware. Is is possible to create a RAID1 (mirroring only) array with 3 live drives, rather than with 2 live plus a spare? Our goal is to have 3 drives in a hot-swap bay, and be able to pull and replace one drive periodically as a full backup. If I do:

[URL]

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General :: Create RAID1 Array With Given/fix HD Labels?

Aug 19, 2010

I have two HDs (let's say sda and sdb). Both are the same size and have the same partitions already (sda1/sda2/sda3 and sdb1/sdb2/sdb3). Basically they are ready to make a RAID1 array.

Writing with new udev rules, I could create and give fix HD labels with /sbin/scsi_id.

Example: For sdb1 I have a fix device name created under /dev as hd2_boot1, for sdb2 I have /dev/hd2_boot2 and finally for sdb3 I have created the device /dev/hd2_boot3.

With using the command "mdadm --create /dev/md0 --level=1 ....", I could create a RAID array.

But, when I check the status one of the RAID devices, like with the command "mdadm --detail /dev/md2", it still shows me as part of the RAID array the sdb* devices, not the hd2_boot* devices. Something like this:

I would like to see basically as member or the RAID array always the /dev/hd2_boot3 not the /dev/sdb3 (like above), is this possible?

Bottom line, I would like to keep the order of the RAID arrays depending their scsi ids, not depending their scsi numberings which is given by the kernel, since the scsi numberings (sda, sdb, sdc and etc.) can change depending the physical connection.

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Ubuntu :: Create A Raid0 Array Of Drives?

Feb 20, 2011

Just got 3 extra drives for my machine.

2x160Gb sata
1x 165Gb sata

How do i create a raid0 array of these drives? On each drive i have got a partition whose size is 160GB and formatted to type fd (Raid Autodetect) i have tried the following:

Code:
mdadm --create /dev/md0 --level=0 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sda1
mkfs.ext4 /dev/md0
mount /dev/md0 /media/raid
but for some reason it doesnt work.

[Code]...

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Ubuntu :: Machine And 'tried' To Create A 4 Disk RAID6 Array On Four New 4TB Drives?

May 30, 2010

I installed 10.04 on a new machine and 'tried' to create a 4 disk RAID6 array on four new 4TB drives.The build seemed to go fine, but a check on the new dev shows the following:

/dev/md0:
Version : 00.90
Creation Time : Sun May 30 21:53:11 2010

[code]....

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General :: Recover A RAID1 Array Using Mdadm

May 12, 2010

I'm looking to recover a RAID1 array hopefully using mdadm. Ive not really used Linux much befor but I'm keen to learn to get my data back. Basically one of the disks in my Maxtor Shared Storage II (2x500GB sata) died and I could do with either rebuilding the array or getting the data off another way.

I have a spare machine I could use for recovery process. It has a spare drive but its only 120Gig, I also have a bigger 320gig disk but thats IDE not SATA. Do I need to purchase another 500GB sata drive or can I use either of my spares? If i do need to buy a new drive could I use a 1TB or 1.5TB or will it have to be 500? Next question is what is that best version of linux to use, I have knoppix 6.2 and Ubuntu (not sure on version) already. I noticed that mdadm isn't installed by default on Ubuntu.

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Fedora :: Can't Mount RAID1 Array?

Dec 29, 2010

I have just upgraded to Fedora 14 from an older version. I now have problems mounting my RAID1 array, which was operating correctly until now. This is a software RAID which was initially built under Fedora 10.The array is md0, and is made of 2 SATA drives (sdc and sdd) which have only one partition. The underlying filesystem is NTFS. The array is assembled correctly and active, as reported by /proc/mdstat and mdadm -D.When I try to mount the array, I get this:

Code:
[root@Goofy ~]# mount /dev/md0 /mnt/raid
mount: you must specify the filesystem type

[code].....

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Ubuntu :: RAID1 Array Fails On Reboot?

Sep 8, 2010

I did a search and couldn't find anything pertaining to this - if I've missed something please direct me in the right direction We have an Ubuntu box set up as a headless office server (latest desktop install of Ubuntu) and we recently set up two 1TB HDDs in a RAID1 array using mdadm - as far as I can tell it worked successfully and created /dev/md0 with an ext3 file system. After sharing the drive I can see it from the other office computers and could transfer data to and from the RAID array just fine.

I didn't figure out how to get it to automatically mount on boot so I restarted it to see if it would do so by default - however, when I restarted I couldn't see the RAID array any longer on the desktop and it came up as a 0.0kb RAID array in Disk Utility, saying it was broken. It wouldn't let me check it until I stopped and restarted the array.

After restarting I hit "check array" and it appears to be repairing the drives. What have I missed? What happened here? How can I fix it? What other info can I provide to assist:

sudo blkid shows:

/dev/sda1: UUID: "<snip>" TYPE="ext3" (system HDD)
/dev/sda5: UUID: "<snip>" TYPE="swap"
/dev/sdc1: UUID: "<snip>" TYPE="linux_raid_member"
/dev/sdb1: UUID: "<snip>" TYPE="linux_raid_member"
/dev/md0: UUID: "<snip>" SEC_TYPE="ext2" TYPE="ext3"

disk utility: RAID Array: Mirror (RAID-1), Metadata version 0.90.0, Partitioning: Not Partitioned, Components: 2...

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Hardware :: Intermittently Clicking HDD On A RAID1 Md Array

Mar 13, 2011

One of my HDD on a 2 drive RAID1 md (linux software raid) is intermittently clicking. When this occurs, I can hear a loud clicking noise at uniform intervals and then it stops. Its like "click..click...click..click...click..click...click..click". You know what I mean

It does it about 4 times per hour. I believe this drive is about to die.

Until I find a replacement drive, can I run into problems with the data on the array? I believe the mdadm utility would tell me if the drive was faulty and once I replace the drive, it would auto rebuild the array (re=copy the data to the new drive)?

I have over 1.2TB of data on this array I really dont want to lose everything...

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Ubuntu :: Raid1 Array Won't Start On Boot

Jan 2, 2011

I created a raid1 disk with Disk Utilities on with Karmic, then upgraded my system to Lucid then Maverick. This Raid disk is just a data store, I'm not booting off of it. when I reboot the raid1 disk does not start. I have to go into Disk Utilities, stop the array and then start it. Then it comes up and I can mount it. I ran dpkg-reconfigure mdadm and it created a valid entry in mdadm.conf. but the array still does not start on boot. I want to have it auto mount with fstab but need to make sure the array starts first.

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Ubuntu Installation :: Booting When RAID1 Array Is Present?

Feb 24, 2011

I'm sorry if this is the wrong section and if there is another thread on the matter. I searched but couldn't find threads with my specific problem. I've just installed Ubuntu 10.10 Server 64 bit which I intend to use as a internal file server.

The hdd setup is:
500gb system disk
1tb storage
2tb storage (2*2tb using built-in motherboard hardware RAID1) When the installation was complete and the computer rebooted I got an error message saying "error: no such disk". After re-installation I got the same message and I then tried disconnecting all the storage devices and it booted perfectly. I then tried connecting up the 1tb drive and again it booted as it should. But when I re-connected the RAID:ed disks the error message re-appeared.

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CentOS 5 :: Permanently Remove Drive From Md Array (RAID1)

May 14, 2011

I installed a distro based on CentOS 5.5 (FreePBX distro FYI). It used an automated kickstart script to create an md RAID1 array of all the hard drives connected to the machine. Well, I installed from a thumb drive, which the script in interpreted as a hard drive and thus included in the array. So, I ended up with three md arrays (boot, swap, data) that included the thumb drive. Even better, it used the thumb drive for grub boot so I couldn't start up without it. I was able to mark the USB drive as 'failed' and remove from each array, and even change grub around to boot without the usb drive, but now each of the arrays is marked as degraded:

[Code]...

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General :: Check On Hard Drives In RAID 1 Array?

Feb 23, 2010

I'm renting a dedicated server with a company that claims that the server has 2 hard drives in a software RAID 1 array, but I need to make sure that the server really has the 2 HDD, and the size of the 2nd drive... how to do that ?? system is Centos 5.3

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Ubuntu Installation :: Hard To Install The RAID1 Array In Brand New PC?

Nov 19, 2010

Like it says in the title, I am thinking it should be this hard to install the RAID1 array in my brand new PC. Here is what is happening. I have two brand new 1TB drives that I am attempting a new, fresh install of 10.10 on (in fact, the entire box is new). I am attempting to use the alternate desktop install so that I can have access to the manual partitioning (which is required to setup RAID 1, correct?).

I tried to use the guide here: [URL]... I followed the steps, but when I got the the very end (after selecting and creating the MDs) I get an error message stating that there is no root file system defined. I went back and checked all the steps and I am sure I followed everything in the guide.

Here are some quirks (not sure if they are bugs or not) In step 5 of the disc partitioning, it says to select the bootable flag and set it to yes (I am assuming). I press enter over that options, the screen flashes really quickly to a progress bar, but then comes back to the options screen and it still says bootable flag is off. No matter how many times I do it is says "off".

Also, and here is the bigger problem I think. - So the guide says to select the free space in each drive and then select Automatically Partition the free space, which I do, and it comes back and looks formatted accordingly - has 975.6 GB ext4 / and 24.6 GB swap swap. No Problem there.

BUT - whenever I do the same thing to the second drive, the partitions on the first seem to disappear. Meaning, it doesn't say free space, and has two partitions listed, but the / and the swap (last items in each row) have moved to the second drive partitions. I am not sure if this is how it is supposed to be since the pictures in the linked guide to not show what it looks like after that. THis is driving me crazy and I have to have it set up in RAID 1 and unsure as to what it is I am missing.

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Hardware :: Determine The UUID Of 2 Disks That Are Assembled In A RAID1 Array?

Feb 17, 2011

I just experienced a HDD failure and while reorganizing the drives inthis machine I realized the benefits of UUID instead of /dev/sdX nomenclature. I am trying to determine the UUID of 2 disks that are assembled in a RAID1 array. right now they are /dev/sde & /dev/sdf with each only one partition. I tried ls -l /dev/disk/by-uuid but I get only the UUID of other disks, not the ones currently ID'd as sde & sdf. my mdadm.conf assembles several raid arrays all by UUID, but somehow, I cant recall how I got the UUIDs of the other HDDs at first...

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CentOS 5 Hardware :: HDD Dma _intr Errors After Rebuilding Raid1 Array

Sep 2, 2009

I've got a mailserver set up in a raid1 array.I shut down the system to install a CD-ROM drive but forgot to change the master/slave settings (I know, don'tt say anything) and didn't realize it before Centos started booting up, so it booted the hdc drive from the array.I rebuilt the array using mdadm without any apparant issues but on subsequent bootup, I get the following error :

kernel: hdc: dma_intr: status=0x51 { DriveReady SeekCompleteError }
kernel: hdc: dma_intr: error=0x84 { DriveStatusError BadCRC }
kernel: ide: failed opcode was: unknown

[code]....

There doesn't seem to be any side effects to this but since that didn't happen prior, I figure there's probably something I didn't do properly since I'm fairly new to the linux world.My raid array was originally set up by the Centos instal software and is set up like this :

hda1 + hdc1 = md0 (boot)
Hda3 + hdc3 = md2 (/)

The other partitions are of the same size on each drive and are swap partitions.

PS : The drive is SMART capable and no errors appear during a self-test.

edit : Clonezilla also fails to boot properly although I don't know if its due to a software raid array in the first place or the errors in the filesystem. When only one drive was detected because of the jumpers, it booted properly.

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OpenSUSE Install :: Mdadm - Change Spare To Active In RAID1 Array?

Aug 7, 2011

I'm convinced that mdadm is going to be the death of me. I've wasted numerous hours on this so far without luck.

OpenSuse 11.4 on an old Supermicro box, creating a software RAID1 array across 2 x IDE 500GB disks. Creating /dev/md0 as a 250MB partition across /dev/sda1 and /dev/sdd1 for /boot, another 465GB partition across /dev/sda2 and /dev/sdd2 as an LVM partition to hold volumes for the various other OS filesystems. After the initial installation and configuration there were a series of mishaps with faulty IDE cables that had drives failing to show up at boot. Somehow, /dev/sdd2 got configured to array /dev/md1 as a spare drive. And nothing I've done so far gets it to show up as an active drive.

The obvious step of failing the partition, removing it, then adding (or re-adding) will bring it back as a spare. I've tried roughly a dozen different permutations of those same steps. The latest was to 'dd if=/dev/zero of=/dev/sdd2' to clear the partition. Thought this might be the trick - after the zero, mdadm -E /dev/sdd2 reported 'no superblock' and no md1 configuration.

So 'mdadm --add /dev/md1 /dev/sdd2' and it still comes back as a spare. Here is mdadm -D /dev/md1

/dev/md1:
Version : 1.0
Creation Time : Sat Jul 9 10:26:01 2011
Raid Level : raid1
Array Size : 488119160 (465.51 GiB 499.83 GB)
code....

I can't stop this array, the OS is running from there. I can't easily boot from CD to repair, all IDE ports have disks attached.

Does anyone have an incantation to promote a spare to active?

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Ubuntu :: Cannot Mount Drives In RAID1?

Feb 15, 2010

I tried setting up my own partition table which apparently didn't go well.I have 1 compactflash-disk for linux and 2 hard drives for data which are set up for RAID1. But the RAID-drives doesn't get mounted.This is my first RAID-setup

Code:
me@server:~$ df -h
Filesystem Size Used Avail Use% Mounted on

[code]...

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Hardware :: Raid1 Mdadm Repair Degraded Array With Used Good Hard Drive?

Jun 27, 2009

I have a used but good harddrive which I'd like to use as a replacement for a removed harddrive in existing raid1 array. mdadm --detail /dev/md00 0 0 -1 removed1 8 17 1 active sync /dev/sdb1I thought I needed to mark the removed drive as failed but I cannot get mdadm set it to "failed". I issue mdadm --manage /dev/md0 --fail /dev/sda1But mdadm response is:mdadm: hot remove failed for /dev/sda1: no such device or addressI thought I must mark the failed drive as "failed" to prevent raid1 from trying to mirror in wrong direction when I install my used-but-good disk. I want to reformat the good used drive first right? I believe I must prevent raid array from automatically try to mirror in the wrong direction.

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General :: Cannot Create Live Usb For OpenSuse Using Live USB Creator?

Sep 22, 2009

I just downloaded OpenSuse 11.1 64 bit live cd from it's official site.I have live usb creater in my xp box , with the help of which I successfully created live USB for fedora 11 earlier. Now the problem is whenever I try to create live usb using Opensuse live ISO image after extracting all files to usb , it gets failed.The same thing is happening with OpenSolaris 11 live cd iso image. Does this mean that live usb creater I have, was only foe Fedora distros?

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Debian :: Adding 2 New SATA Drives As RAID1?

Feb 8, 2009

i have 2 shiny new 1TB SATA drives. I have a running system already, basic install on a single disk. install both new drives & raid1 them on a single partition - mount them for storage. Seems simple but all i can find are howto's on instaling the whole system & booting on RAID.

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Slackware :: Moving RAID1 Drives Into Computer With Same Md Numbers?

Feb 12, 2011

My old workhorse computer's motherboard died yesterday, and I want to get everything off of its RAID1 array. I have a backup on an external drive but it's a few weeks old and I'd like to make sure I've got everything.

The old machine ran Slackware 12.1, and had a 2-drive IDE 250GB RAID1 array with partitions:

md0 - swap
md1 - /

The new machine has Slackware 13.1, and also has a 2-drive SATA 250GB RAID1 array with partitions:

md0 - /
md1 - swap
md2 - /home

I put the IDE drives from the old computer into the new one. I'm not sure how to get the old array going now. I'm not sure if I should use mdadm with --assemble (since the array was already set up before) or with --create (because the array needs to be renamed so it doesn't clash with the new computer's md1). I'm thinking I should use --create and give the old md1 a new name (md3). But I'm not sure if anything bad will happen if I use --create on an array with data on it.

Output of mdadm -Esv:

Code:

ARRAY /dev/md0 level=raid1 num-devices=2 UUID=9a0cc71f:df5e59d9:50e7b281:3adcc49f
devices=/dev/sda1,/dev/sdb1
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=698c321a:8008c659:d8c7deeb:c1dd303c

[code]....

The old drives are the last two entries, sdc and sdd. It's odd that the order is reversed. I had (non-RAID) Windows partitions on both drives and I've mounted them and verified that the drives are on the IDE cable in the right order, and sdc is the original 1st drive of the array, and sdd is the 2nd drive of the array.

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General :: DMRAID - Getting A Live Distro That Can Mount A Fakeraid Array?

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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OpenSUSE Hardware :: Running A Software RAID1 On 3xSATA Drives?

Oct 22, 2010

I'm running a software RAID1 on 3xSATA drives. I'd like to make one a spare. How do I do this? Is there a way so that once I do when I have a drive failure the spare will automatically mount and be made a mirror?

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Ubuntu :: Hard Drives (RAID1 Via Firewire) Setup Sought?

Aug 14, 2010

I searched, and unfortunately all that did was raise my confusion level on this. "Grub"? "mdadm"? "fake"?, S/Wraid? Disk utility? So many options, so little understanding! Relevant stuff (Mostly reported by "Disk utility"):

- Lucid Lynx. PATA host adaptor -> IDE controller -> Maxtor 164GB H/D [I *think* this has Windoze on it, but can't remember!] There's also a CD & DVD drive on this IDE bus. PATA host adaptor -> SATA controller -> Seagate 500GB H.D. - The Ubuntu boot drive, currently a 250GB ext4 partition, 3GB swap and 250GB "unused".Peripiheral devices -> Firewire 400 -> 2 x Samsung 500GB H/D's. These were "stolen" from my Mac Book and are currently a RAID1 Apple array. Everything they contained is safely backed up, and these can be considered as "new" drives awaiting formatting. [It's actually a Buffalo Drivestation Duo, but their site was even more confusing than here.

everything is working wonderfully, but I'd like to use the 2 F/W drives in a RAID1 array - So, eventually to the question: How do I tell Ubuntu to use these drives as a RAID array? It seems I can format and partition etc from disk utility. Do I then use mdadm for configuration? Any other recommendations?

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CentOS 5 :: Mistakenly Setup RAID 0 Array On / Instead Of RAID1 During Setup - Convert Without Loss?

Dec 15, 2010

So I didn't notice when I setup my CentOS 5.5 server that I left / as RAID 0 on md1. All the rest are RAID 1. Is there a way I can modify the array to RAID 1 without a risk of data loss? I'm glad I caught this before I setup any other services. I've only setup smb so far...

[root@ftpserver ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md1 16G 3.0G 13G 20% /

[code]....

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General :: Bash Scripting - Executes A Few Perl Scripts - Create A New Array And Take The Hostname

Apr 4, 2011

I'm writing a bash script that executes a few perl scripts. One of the perl scripts that I need to execute requires two arguments with it. The arguments are stored in a txt file, each line contains a hostname and its corresponding IP address separated by a ":" (colon), the txt file looks like this below:

[Code]...

I'm not sure if it's the best way to accomplish this but here it goes. In the bash file, let's call it getHosts.sh, I create an array and assign each line of the file to an element in that array. I then think I need to create a new array where I take the hostname (which is before the ":") separate it from its IP address and place the IP address on a new line just below the hostname (this way I can reference to it like $hostNames[$x] would be the hostname, and $hostNames[$x+1] would be its IP address). So the new array would now look like this below:

[Code]...

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CentOS 5 :: Possible To Add Second Hard Drive To Create Raid1?

Jul 2, 2010

The motherboard currently installed on my PC has a RAID Utility (Ctrl+I) at the startup that allow creating RAID1. But I already have a system installed with CentOS 5.4. In order to protect my data, I need RAID1. Can I add another Hard Drive now and have the data mirrored and synced onto both hard drives as if it was in RAID1 right from the beginning?

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Ubuntu :: RAID 5 Array With 4 2TB Hard Drives?

Mar 17, 2010

I want to make a RAID5 array with 4 2TB hard drives. One of the drives is full of data so I will need to start with a 3 disks and then once I copy the data from the 4th onto the array, I will then add the 4th drive. This will be my first experience with RAID. I've spent a few hours searching for info but most of what I have found is a bit over my head.

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Ubuntu :: Combine The 2 Additional Drives Into A RAID 1 Array?

May 11, 2011

I got my system up and running with the Grub installed on my primary hard drive. I have not installed 2 additional drives. I would like to combine the 2 additional drives into a RAID 1 array. I can only find tutorials on how to do this during initial install. I cannot find one that tell me how to do it after the install. Is there a way?

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Ubuntu Servers :: RAID 5 Software Array With 3TB Drives

Jun 15, 2011

I am trying to use 3 3TB Western Digital drives in a raid 5 software array. The trouble seems to be that the array is created with only 1.5 TB of capacity, rather then the expected 6 TB.

Here are the commands and output:
$ sudo dmraid -f isw -C BackupFull6 --type 5 --disk /dev/sde,/dev/sdf,/dev/sdg --size=5589G
Create a RAID set with ISW metadata format
RAID name: BackupFull6
RAID type: RAID5
RAID size: 5589G (11720982528 blocks)
RAID strip: 64k (128 blocks)
DISKS: /dev/sde, /dev/sdf, /dev/sdg
About to create a RAID set with the above settings. Continue ? [y/n] :y

$ sudo dmraid -s
*** Group superset isw_cdjhcaegij
--> Subset
name: isw_cdjhcaegij_BackupFull6
size : 3131048448
stride : 128
type : raid5_la
status : ok
subsets: 0
devs : 3
spares : 0

So I cannot understand why the size of the created array is only 3131048448 or about 1.5 TB. The first command seemed to imply it was going to create an array with 5589GB.

System is:
Description: Ubuntu 10.04.2 LTS
Release: 10.04
Codename: lucid

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