Tagged Questions
1
vote
0answers
141 views
Ubuntu Server 12.10 -> 13.04 Upgrade & MDADM Raid Arrary
Now that 13.04 is out - i am looking to upgrade my home server (test rig) to have a play. Just wondering what effect running
do-release-upgrade
Would have on my MDADM raid array? Would it survive ...
0
votes
0answers
37 views
Need to reboot twice when Ubuntu 12.04.1 mdadm RAID1 degraded
I'm testing mdadm RAID1.
I'm using two HDD.
Created / (/dev/md0 with /dev/sda1 and /dev/sdb1) and
swap (/dev/md1 with /dev/sda5 and /dev/sdb5)
After OS installed. I removed one HDD and reboot the ...
0
votes
1answer
76 views
RAID array: cannot access files on one partition, getting Input/output error
I'm hitting an access error with part of a raid array and need help in troubleshooting this.
History: Several raid partitions live on 4 disks. Four days ago some ticking noises were heard from the ...
0
votes
0answers
26 views
Recover a software raid setup set up in 12.04 that's been removed since clean install
I installed 12.04 from the alternative install CD last year, I ungraded to 12.10 no problem and the system ran fine for 7 months. I originally setup two HDD's in a software raiding using the ...
2
votes
0answers
19 views
I grew an array with mdadm but I can't see the progress?
Today I added a 5th drive in my array, I did the following:
mdadm --add /dev/md0 /dev/sdf1
My drive was added as a spare, I then did:
mdadm --grow /dev/md0 --raid-devices=5
But when I want to ...
0
votes
0answers
66 views
How to set up RAID1 on installed Ubuntu 12.04
I have two slightly different 1 TB hard drives and I want to create a RAID1.
I have spent last 5 hours trying to archive the same effect on virtual machine, because I want to test it out before ...
1
vote
0answers
26 views
MD arrays mounted incorrectly (no rwd)
I've got various RAID 1 & 0 (MDADM) arrays mounted in /media/ via fstab but I'm coming into trouble creating/deleting files from some of these volumes from the GUI and programs, it's as if they ...
1
vote
0answers
73 views
Is there a fix for md raid failure on 12.04
I've got a system that ran cleanly on Ubuntu 10.04 LTS.
Upgrading to 12.04 LTS / 12.04.1 LTS / 12.04.2 LTS has been unpleasant and unsuccessful.
Install goes cleanly and I have installed as follows:
...
1
vote
0answers
135 views
broken raid 1 array - I think I messed up
I have a big problem with my raid setup. So if anyone is interested, please help...
I have a raid1 setup with 2 hdd. One day I saw in the SMART data of one on the disks that it had some bad sectors, ...
1
vote
1answer
50 views
RAID (mdadm) - Flags necessary?
As I understand it, it's best practice to set the drive flags as "raid" before adding them to a mdadm raid array. Okay fine, but I also heard people say that they didn't do this and mdadm worked fine. ...
3
votes
1answer
595 views
Can I cache an mdadm raid with an ssd?
I have a 1TB array set up in raid 1 using mdadm on Ubuntu 8, to store mission-critical files. I'd like to speed up read/write, especially for large files by caching to an SSD. Is this possible? Does ...
2
votes
1answer
196 views
RAID (mdadm) - What happens if drives are mismatched in size?
Question 1 - Before you answer with "it just takes the smaller disk", hear me out quick. My 3TB WD Reds come out to be 3001 GB in size. Let's say I set up a mirror via mdadm for sdb1 and sdc1 which ...
0
votes
1answer
65 views
RAID (mdadm) - File system relevant prior to building the array?
In the event I want to set up a RAID 1 mirror utilizing mdadm, is it needed to have a file system on the drives first? Reason I ask is my desktop which has RAID 1 (built from the alternate install CD) ...
3
votes
1answer
950 views
Software raid - mdadm - re-find my array
Description
Today I plugged in another hard drive and unplugged my raid drives to ensure when I wiped the drive, I would not accidentally pick the wrong drives.
Now that I have re-plugged in my ...
1
vote
0answers
66 views
How to prevent Ubuntu from assembling degraded RAID on boot?
I have RAID 5 on 3 hard disks, in which one of them is external on USB 3. I'm facing problems on boot because sometimes the external drive isn't detected or maybe isn't ready soon enough, and the RAID ...
0
votes
2answers
170 views
Would Mdadm be faster than fake raid adapter?
I just bought myself 2 x 3tb wd red drives and a startech 4 port raid card . Unfortunately, I have a very, very strong suspicion that this is a 'fake-raid' card as it is not from any of the main ...
0
votes
1answer
710 views
How to make GRUB2 detect and boot Ubuntu on a RAID 1?
grub 2 is unable to detect /dev/md1 which is a raid 1 drive on my computer.
When I press c in grub menu and run ls I get a list of all the drives but don't see md1 for booting Ubuntu which is on ...
2
votes
0answers
197 views
New computer, same RAID. MDADM won't assemble
Ubuntu 12.04 64. Hardware failure (motherboard) led me to build a new machine, and I took the opportunity to do a fresh install of Ubuntu (first one was a learning experience). I moved the raid disks ...
3
votes
1answer
88 views
RAID 5 reassemble stating wrong homehost?
So I went from a degraded RAID, to a dissasembled RAID, to now trying to reassemble it. Im getting a weird message when trying to --assemble the RAID. I have 6 drives, so /dev/sd[a-f]1. When trying to ...
1
vote
0answers
43 views
How to I add a drive to a system that already has a software raid on it
I currently have a Ubuntu 12.04 server booting off a USB stick and running a raid 0 configuration with 2x 2TB drives.
I would now like to add an additional stand alone drive (not as part of the ...
0
votes
0answers
73 views
Device cannot be added on software-raid-1 array on Ubuntu 12.04
Unfortunately all tutorials I have found online until now on how to setup software-raid-1 are outdated on ubuntu 12.04
My target is to setup it on a system with a secondary disk drive that is already ...
1
vote
0answers
305 views
Recovering from RAID5 with 2 failed drives, only one of them really dead
I have (had?) a RAID5 with 3 devices. One of them died, and after some days I experienced that the RAID stopped at all. However, I could restart it without experiencing any problems, but it stopped ...
0
votes
2answers
1k views
Add two new HDD in Raid 1
I just made a fresh install of Ubuntu 12.10 on a new SSD (/dev/sda). Now I would like to add two 1TB drives (/dev/sdb /dev/sdc) in RAID 1 but I'm pretty clueless on how to do it.
This is what I came ...
0
votes
0answers
19 views
300gigs already used on just created raid 5 volume [duplicate]
Possible Duplicate:
New ext4 partition and used space
I was just wondering if this is normal. Why is 45G already used when I just created the volume and haven't put anything on it yet? What ...
1
vote
0answers
805 views
ubuntu 12.10: raid 5 array degraded on every boot [closed]
I'm running ubuntu 12.10. I've set up raid5 using 3 HDDs: /dev/sda, /dev/sdb, and /dev/sdc. However on every boot I get this screen:
Which says
raid level 5 active with 2 out of 3 devices, ...
1
vote
0answers
121 views
How do I reinstall ubuntu without losing my software raid 5?
I want to change to do a fresh install without keeping my data on my primary hard drive, but I also have 4 2TB Drives in a software RAID 5 array that I created with mdadm and I don't want to lose ...
2
votes
2answers
614 views
Ubuntu Server 12.04, MDADM device number suddenly changes?
I'm facing a really annoying bug, I have set up a Software RAID1 with mdadm, and the setup went just ok with this results
/dev/md/lucas.mgscreativa.com.ar:0
I have also configured mdadm.conf ...
1
vote
0answers
83 views
Can't start system due to mdadm failing
I used to have a 5-disk RAID5 partition, all working very well. I have then decided to add 3 more disks on it, totaling 8 equal disks. I've opened Webmin and just asked to add the disks.
Then I've ...
0
votes
0answers
84 views
Migrate linux from software RAID (mdx) to hardware RAID
Current situation:
Dell PowerEdge T300 server (SAS6/iR controller) (RAID 0/1)
Ubuntu 10.04 LTS
server installed on software raid (2x500GB) + LVM. Currently used
space 25GB.
Questions:
How to ...
0
votes
0answers
100 views
Raid 5 harddrive failed but smart says its fine. Should I replace?
I have being running on three 2TB hard drives in software raid for a little under a year how under Ubuntu Server.
After restarting my computer mdadm would not allow a boot because the raid was ...
2
votes
2answers
475 views
Removing mdadm array and converting to regular disks while preserving data
I have a 6 disk (2TB each) mdadm RAID 5 volume created in Ubuntu 12.04 Server. However, I'm moving to a different solution and want to "unraid" my disks but keep the data. Only 50% is in use.
From ...
3
votes
1answer
195 views
OS drive failure and RAID5 mdadm question
I'm fairly new to Ubuntu but I was able to setup my server with RAID5. The OS resides on a separate drive and there are 3 drives in my array.
The problem is that I had to reinstall my OS on a new ...
0
votes
1answer
784 views
MDADM Raid Drive rebuild each reboot
So I have been posting a lot about a RAID build with MDADM and Ubuntu (sorry about that). Im just not understanding whats going on with my setup.
I have a RAID-5 setup, and followed this guide ...
0
votes
1answer
512 views
Ubuntu 12.04 mdadm inactive
For a while now, my RAID 5 has ceased to work. Everytime I tried "madm --detail /dev/md127", its states all the drive and drive info, but that two of the drives have been removed.
After some ...
0
votes
1answer
621 views
Can I create a hybrid software-RAID array with disks of different sizes?
Products such as Synology offer something called Synology Hybrid RAID
http://www.synology.com/us/products/features/RAID.php
This RAID type allows you to make best use of your disks available by ...
1
vote
1answer
393 views
Raid 5 mdadm Problem - Help Please
My Raid 5 array (4 1tb Disks WD10EARS) had was showing as degraded.
I looked and one of the disks wasnt installed, so i re-added it with the mdadm add command.
the array is now showing as (null)Array ...
4
votes
2answers
3k views
Put HDDs in standby after X minutes using hdparm doesn't work
I use Ubuntu 12.04 on a home server. There are 5 hard drives: one SSD with the OS and 4 HDDs (Samsung HD204UI) configured as a RAID5 using mdadm.
I don't need the RAID very often (say, about once per ...
0
votes
1answer
943 views
mdadm trying to resync/rebuild array automatically
Previously I had setup a ubuntu server using mdadm with 4x 2TB drives. One of my drives died and since this was my backups of my data on different servers I didn't care about losing it.
Since then, ...
6
votes
1answer
2k views
Do I have to worry about “error: superfluous RAID member”?
When running update-grub on the newly installed Ubuntu 12.04 with an older software RAID (md), I get:
error: superfluous RAID member (5 found).
error: superfluous RAID member (5 found).
Generating ...
1
vote
1answer
2k views
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 ...
2
votes
3answers
558 views
get rid of software raid
We are running software raid1 using MDADM on ubuntu 11.04. What's the best way to get rid of it Keeping the current system ?
I want to use hardware raid instead.
What I tried to do:
-Copied the ...
0
votes
0answers
555 views
recover RAID5 array
I've just upgraded my server from ubuntu 11.10 to 12.04 and now have some problems with my RAID5 array (although I'm not sure that it has anything to do with the upgrade). Anyway the current problem ...
2
votes
2answers
382 views
raid 5 name changing during reboot
I left my server running all night 'recovering' after i built a new raid 5 array using the command:
mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sd[bcd]1
My server spent all ...
0
votes
1answer
355 views
Replaced drive in RAID array--now can't boot?
I have a home server running 10.04 configured with an mdadm-based RAID array. The boot and /home partitions are both on RAID-1 arrays, and I have a large data partition on RAID-5. There are three ...
2
votes
1answer
373 views
Recover mdadm raid5 from disk images
My computer just died (won't turn on) and I had some data saved across 4 raid5 disks configured with mdadm. I don't have another computer with sata controllers and want to try to recover using my ...
2
votes
0answers
471 views
Raid won't mount on boot after reinstall [duplicate]
Possible Duplicate:
MDADM Superblock Recovery
So I was having a lot of trouble with Ubuntu after upgrading to 11.10. I decided to do a clean install, and things seem to be much better. ...
2
votes
3answers
18k views
MDADM Superblock Recovery
After a power cycle I found my RAID 5 Array no longer working. I tried various methods to reassemble the array but nothing has worked so far. I believe I need to recreate the superblocks and UUIDs ...
5
votes
4answers
11k views
How do I rename an mdadm raid array?
For some reason, when I try to rename an mdadm raid array to a textual name, the change doesn't take.
I tried the advice from this serverfault question, but to no avail.
~$ mdadm --version
mdadm - ...
4
votes
2answers
4k views
Switching mdadm to an external bitmap
I've just read this in another post about improving RAID5/6 write speeds:
After increasing stripe cache & switching to external bitmap, my speeds are 160 Mb/s writes, 260 Mb/s reads. :-D
...
2
votes
2answers
2k views
Delete mdadm array but keep data
I have a two-disk mdadm RAID1 array. One of the disks has died so the array is in a degraded state. It's been like this for a while and while I didn't mind getting the occasional email through, ...
