RAID stands for redundant array of independent disks, and allows for disks to be linked in various ways. Common RAID setups in Ubuntu are a hardware RAID, FakeRAID and software RAID.

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Should I disable write cache in an mdadm array?

My gut says disabling write cache on soft RAID5 is the smart move, but I'm not certain. Possible Considerations: The drives a WD20EARS with 64Mb cache. The server hasn't gone down due to a power ...
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Using btrfs in RAID arrays and partitioning

Probably stupid questions but here goes: Can btrfs use only a portion of a HDD in a raid "array"? I have 3 HDDs: 80GB, 160GB, and 200GB external USB. I want to put root+boot in the first 20GB of the ...
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Is a disk/ata timeout exception dangerous?

I have a few hard drives in mdadm RAID 5 configured to go to standby after a few minutes of inactivity. (Using hdparm.conf spindown_time.) At irregular intervals I get messages like these in dmesg: ...
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Mdadm seems to have completely forgotten about a device and shrunk my array

After a bit of investigating of a problem I've just encountered, it looks like mdadm has completely forgotten about a new device I'd added to an array. I recently added a new device to the array which ...
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441 views

Does rebuilding a RAID change data?

I've just restarted my computer which was building up a RAID5 for the first time. This of course meant that my computer had to rebuild the whole thing from ground up. Before I restarted the computer ...
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Any howtos on de-Xen'ing a box? [closed]

I have a box that has Xen on it. It currently has only one DomU. Given that Xen isn't supported in the newer versions of Ubuntu...are there any good HOWTOs or other instructions for removing Xen? ...
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How To Mount RAID0 on Ubuntu (to recover data from Acer Aspire S5 Ultrabook)

Recently I ran into booting issues with windows 7 on my Acer Aspire S5 ultrabook. Before bootup, the system indicated that one of the physical disks (the ultrabook has two 128 GB SSDs in preinstalled ...
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mhddfs not working as expected

when I run df -h I get: Filesystem Size Used Avail Use% Mounted on /dev/sda2 74G 3.0G 67G 5% / none 4.0K 0 4.0K ...
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Can't reboot after installing 10.04LTS

I am trying to upgrade from 8.04LTS to 10.04LTS and onwards to 14.04. I first tried to download 10.04 via the Internet but the install crapped out half way through. I have now tried three times to ...
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Recover data from RAID1 array (My Book Live Duo)

I have a WD My Book Live Duo device which I used as a network drive with a RAID1 configuration. The device, which was working flawlessly for almost 2 years suddenly stopped working, that is; it was ...
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Will the boot-degraded flag remain after upgrading to 14.04?

I am currently running Ubuntu 12.04 and have a RAID setup with the boot-degraded option. If I upgrade to 14.04 will the boot-degraded option remain? I manage this server remotely and would hate to ...
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956 views

MDADM RAID1 Home Server System disk error: incrementally starting raid arrays mdadm: Create user root not found

I'm not sure what else to check. Everything below looks sane to me but the system hangs on boot. This is a home server with four disks crammed into a Dell OP620. Each pair of disks are assembled as ...
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349 views

Installing EFI to Raid 1 using partman and seed file, on both drives

So my question is, Is it possible to install the EFI partition onto both drives when doing a seed install on Ubuntu? That way if one drive goes, the relevant efi partition/data is there on the second ...
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825 views

How to mount Intel Matrix RAID 0 on Ubuntu 13.10 live?

I'm not a heavy Ubuntu user. I have a Sony Vaio Z series laptop with two 64GB SSD disk working in RAID 0 (Intel Matrix - Intel Rapid Storage Technology) under windows 7. The quest is to mount this ...
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Recovering a degraded RAID array

I was just given an external hard drive by a colleague, with the comment "Hey, you're running Ubuntu. Maybe you can recover some of the data from this really old disk that nobody knows who last used?" ...
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S.M.A.R.T. test reports defect, can I re-initialise the drive?

On my server I have a 4 disk RAID-5 configuration. One of the drives fails the S.M.A.R.T. test. The array has not yet been declared as degraded but the disk shows up as needing replacement. I don't ...
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581 views

Home Microserver using Ubuntu and ZFS: about ZFS

I see this topic is quite a popular ([1], [2]) so hopefully I can get nice feedback on what I'm trying to do. I'm buying an HP Microserver with 4x 2TB, and I currently have two computers. I'd like ...
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Installing Ubuntu with Software RAID 10

I just set up Ubuntu 12.04.3 Server LTS with software RAID 10. Here's the steps I followed for setting up RAID: 1) Automatically partition one of the drives in order to determine the sizes of the ...
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hpacucli on HP ProLiant DL320e Gen8 with Ubuntu 12.04LTS 64bits

I'm trying to get working the HP Smart Array utility "hpacucli" on a ProLiant DL320e Gen8 server since it's officially certified. The program is installed successfully (I followed this guide) but ...
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Raid drives are missing filesystem

I recently had to do some troubleshooting with a RAID 5 on Ubuntu Server (a software raid). I ended up removing everything and start from scratch with 2 new drives. So I took out 2 out of 4 drives, ...
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How do I change volume sizes on Ubuntu Server 12.04.3 without reinstalling?

I have a HP DL380 G7 Server with the HW Raid configured at Raid 1+0. Previously, I have 146GB LFF SAS Installed but I since have upgraded to 600GB LFF SAS Drives. Since the Mirror Rebuilding was ...
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RAID1 array lost after upgrade from Ubuntu 11.10 to 13.04

I had a working Ubuntu 11.10 with / on an SSD (/dev/sdc) and /home on a software RAID1 array that resided on two partitions on /dev/sda and /dev/sdb (identical drives), respectively. This was set up ...
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LVM2 builtin raid - how to check raid status

I just created LVM2 builtin RAID1 (something like lvm mirrir, but newer) with lvconvert --type raid1 -m1 /dev/ubuntu/root /dev/sdb5, Ubuntu 12.10. How can I check mirror status/health both in ...
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What happens if a HDD of my RAID1 setup fails?

I have the following setup: Filesystem Size Used Avail Use% Mounted on /dev/sda1 37G 1.1G 34G 4% / udev 1.6G 4.0K 1.6G 1% /dev tmpfs 651M 348K 651M 1% ...
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Two different SSD drives, which one to mount for home?

I've had a 128GB toshiba SSD on my T400 and have just bought a new 240GB intel SSD (335 series). I want to have a clean new dual boot install of ubuntu and windows 7. With my SATA II system, the new ...
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676 views

How to solve Critical Logical Driver

I was checking the logs in server when i came across this message. Nov 4 12:52:05 SERVERNAME ServeRAID Manager Agent: [338] Periodic scan found one or more critical logical drives: controller 1. ...
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Running Windows 7 64bit on Raid 0

Can I install ubuntu 12.04 alternate from the CD (Full Complete Install) without tearing down my present Raid Configuration?
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Raid 1 can't install Ubuntu 12.04

I am trying to install Ubuntu desktop on HP Compaq 8000 from an Ubuntu live CD. I connected two disks in RAID, but in installation type, I can't select nothing.
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How to fix the device names of USB storage devices?

I would like to try building RAID system using two or more USB drives for just an experiment. But, the device names of USB drives will be changed whenever they reput or the system reboot. For ...
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Failed install 12.04 on Intel Hardware Raid with Large Partition (> 2TB)

I have Intel Hardware Raid on the motherboard. I have 10 2 TB HDD that I've configured as RAID 1+0 to be one big 8 TB HDD. Now I'm trying to install ubuntu 12.04 on it. After installing with ...
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MDADM Raid 0 won't mount: one drive has bad superblock

I'm quite new in the world of Linux and software-raid but I encountered a problem in which I hope you guys can help me. Few days ago the system was not shutdown properly and when I booted the mdadm ...
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Raid Shows Up as Multiple Drives - Can't Mount

I have a single hard drive that the OS is installed on and I have Sil raid card installed with two matching 500GB hdds set up in Raid 0 and formatted- they're completely empty. For whatever reason ...
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Install Ubuntu 10.04 on ICH6R RAID 1

I have a machine running Win7 in RAID 1 Mirror Array. I want to install Ubuntu 10.04 along Win on this machine. Can someone point me in the right direction. Will Ubuntu recognize this automatically? ...
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Server stuck at black screen after reboot

I recently put together a new server running Ubuntu Server 11.10 and it's all working great except for one little detail. Whenever I run "sudo reboot" everything works fine until I get to the grub ...
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Installed Ubuntu on a separate HDD, got a grub error and want to know if anything went wrong

I installed Ubuntu on my spare HDD and everything was going fine until the setup installed GRUB. I have 3 HDDs in RAID0 and a spare HDD where I chose for Ubuntu. The error said that GRUB cannot be ...
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Add new hard drive to mirror existing LVM drive with raid1

I have a 320GB hard drive with an LVM2 volume group that was created as part of the default installation. If I put a second 320GB hard drive into the computer, can I make the second drive mirror the ...
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809 views

Grub can't find RAID partition in fresh install of 11.04

I attempted to install 11.04 on a Dell PowerEdge-R610 that has a LSI SAS1068E-based hardware RAID setup (I think). Installer finishes without a hitch, but upon reboot, it appears that Grub can't find ...
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621 views

Installing 10.04 server on HP xw9400 Workstation with RAID 5

I have a workstation that was given to me that is a friggen powerhouse, so I figured I would set it up as my development and demo server. This is my first experience installing Ubuntu onto a RAID ...
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759 views

How do I fix a slow boot on a RAID setup?

I've just finished setting up a RAID 1 on my system. Everything seems to be okay, but I have a very slow boot time. It takes about three minutes between the time I select Ubuntu from GRUB and the time ...
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281 views

What does “md value mismatch_count” count?

Since upgrading to 11.04 I have been trying to get my 5 disk RAID5 array back online. The array was initially split in two, I tried to use a create command with the assume clean option to get it back ...
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736 views

Raid md device is not remove from memory, how to overcome this problem

I create raid 10 , i removed two arrays form md11 one by one , after that i going to editing the contents those are mounted ( it will be not responding stage), after i try for remove arrays those are ...
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How do I know what physical drives/partitions are behind my /dev/mapper/isw_dghbbcaabe_RAID_Volume11?

This is a just upgraded Ubuntu 10.04.1 LTS machine. The /dev/mapper/isw_dghbbcaabe_RAID_Volume11 is "new" to the upgrade but I don´t know what physical drives/partitions are included in the "device". ...
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How to fix boot message [RAID partition] not ready yet? [duplicate]

Possible Duplicate: mdadm: breaks boot due to “is not ready yet or not present” error I've got a RAID 5 setup for my /home partition. Every two to three boots my hdisks don't ...
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Can the C: drive in WINE be put in the RAID 10 local to host Ububtu 12.04 LTS

really new to Ubuntu, and even newer to WINE. Is it possible to move the C: drive in WINE to use a Raid 10 array that is internal local to host non boot storage. I really want to keep the SSD boot ...
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mdadm build legacy array on boot

I have RAID0 that was built using windows dynamic disk. I've read that this is a legacy array and can be assembled using build in mdadm. I've gotten the array to build and mount using the following ...
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RAID1 /dev/md0 showing up as /dev/md126 after reboot

I've already configured the file: /etc/mdadm/mdadm.conf with the outcome of : mdadm --detail --scan ARRAY /dev/md0 metadata=1.2 name=compute2:0 UUID=4e0dd53b:c29a881a:795286f7:a649ff4a ARRAY ...
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Slow raid5 resync with WD Green drives [closed]

The Question Why is my initial resync so slow? Initially cat /proc/mdstat reported ~ 30000K/sec. I then increased /sys/block/md0/md/stripe_cache_size from 256 to 16384. That increased the speed to ...
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Is it possible to use a dedicated parity drive without striping?

I'm setting up a log server. I'd like to set them up so that each disk is independent of the next, but the last disk is parity of all the rest. The reason why I want this is because: You can't ...
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Cannot install Ubuntu - stuck at 'Installation Type'

I am trying to install Ubuntu on my computer, but am stuck at choosing the device and partition to install to. I have three harddrives, one of them was going to be dedicated to Ubuntu, but two of the ...
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RAID not assembling after reboot, throws “uuid not in config file” even though it is

I created a RAID5 array using 4 x 2.0Tb drives using the disks GUI. I used mdadm --detail --scan >> /etc/mdadm/mdadm.conf to save the configuration. I opened the mdadm.conf file and double ...