The mdadm tag has no wiki summary.
3
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1answer
44 views
+50
Simple mdadm RAID 1 not activating spare
I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin.
The command sudo mdadm --detail /dev/md0 used to ...
0
votes
0answers
44 views
mdadm recognizing array incorrectly how can I recover the data
So I formatted both disks sd[cd], each as a big ext4 partition, and then used mdadm to create a raid0 array sd[cd]1. This worked fine, and I mounted the device and started storing data on it. Prior to ...
0
votes
0answers
64 views
Cannot format raid device mdadm
I can't seem to format my newly created raid array (sync has completed) on Ubuntu 12.04 Server (64-bit).
When I try to run mkfs I get the following error:
root@genesis:~# mkfs -t ext4 /dev/md0
...
0
votes
1answer
82 views
Getting advanced format drives to like new?
I have 5 2TB WD Green (WD20EARX) drives that I eventually want to put into software RAID 5. I can't seem to find a complete guide on getting these drives prepared for use with Ubuntu (mdadm) that ...
1
vote
0answers
48 views
Please evaluate my NAS solution for home use (Linux, mdadm, xfs, aufs) [closed]
I am currently running my home server using Debian Squeeze, on a Intel Pentium E6700 based PC (Intel DQ45CB Board), and 6GB of regular (non-ECC) RAM.
There is a total of 15 drives connected, mostly ...
0
votes
1answer
107 views
Safety of Truecrypt for Large Raid5 using ubuntu, mdadm, lvm, ext3?
I'm planning to set up a large (probably 6-9Tb) raid-5 array on ubuntu using mdadm, lvm and ext3. Does anyone have any opinions or suggestions on the safety of using a Truecrypt volume for that amount ...
0
votes
1answer
90 views
Adding Space to RAID5 using mdadm, lvm and ext3
I have seen a few descriptions about using mdadm with lvm to create an easily expandable raid, such as this question, but I still think I'm missing something. Say that I create the raid using mdadm ...
1
vote
3answers
113 views
Linux software raid robustness for raid1 vs other raid levels
I have a raid5 running and now also a raid1 that I set up yesterday. Since raid5 calculates parity it should be able to catch silent data corruption on one disk. However for raid1 the disks are just ...
-2
votes
0answers
198 views
mdadm initial resync [closed]
I created your typical RAID 1 with mdadm. I noticed (by looking at /proc/mdstat) that it was about 10% thru its initial resync. After adding the array to /etc/mdadm/mdadm.conf, I rebooted the system ...
1
vote
2answers
76 views
Can I use an entire drive for as a software raid member?
Can I use /dev/sda and /dev/sdb for my RADI1 configuration?
Or do I first have to partition both with a single Linux raid partition?
1
vote
2answers
109 views
Recover data from RAID 0 disk images
I have four (4) disks which are in RAID 0, but the (Lacie) hardware enclosure failed and I'm trying to recover the data stored. I'm now trying to rebuild the RAID to access the data stored, but can't ...
1
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0answers
235 views
mdadm: hot remove failed
My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /):
...
1
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0answers
277 views
mdadm raid5 read error not correctable
I have a software raid5 setup existing of 4 disks.
sda, sdb, sdc, sdd
Since everything was up and running I wanted to test the array. To do this I pulled the plug on one of the disks (sdd).
Everything ...
0
votes
1answer
45 views
How to identify raid1 disks
I would like to know how mdadm identifies physical disks of raid1 .
I think it is managed by uuids not device file like /dev/sdc2 /dev/sdd2.
But I can`t confirm such information of raid1.
2
votes
2answers
327 views
Does RAID1 increase performance with Linux mdadm?
I have a cheap 2-bay NAS with a 2TB HDD. To be robust against disk failure, I'm thinking of buying a second 2TB HDD and putting it in RAID1 with Linux mdadm. The file system is ext4.
Will this ...
3
votes
2answers
379 views
Fault tolerant RAID6 / RAID10 design for home server - not performance critical
I want to balance disk space against fault tolerance. I would like fault tolerance to be able to handle multiple disk failures (as I may not be able to afford replacements disks or have the time for ...
0
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2answers
198 views
How does one enable --write-mostly with Linux RAID?
Unfortunately the mdadm and mdadm.conf man pages are not quite up to par. I would like to enable the --write-mostly flag for my RAID, but neither the man pages nor the internet will tell me how. I am ...
0
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3answers
372 views
How do I mount a software RAID1 (mirror) created by windows in Linux using mdadm?
I'm switching my Windows server to Ubuntu and am trying to get my software RAID1 (mirror) that I created in Windows to show up in Ubuntu. I have read that this is possible here using mdadm, but I'm ...
1
vote
1answer
226 views
degraded mdadm RAID5 array
My /dev/md0 array just died last night. I got this email
This is an automatically generated mail message from mdadm running on
A Fail event had been detected on md device /dev/md0.
It ...
1
vote
2answers
92 views
Is it possible to safely get data off a hard drive thats a member of a mdadm-mounted RAID1 array via USB?
I have a RAID1 array of two drives created with mdadm. Is it possible to remove one of the drives, hook it up to a USB SATA adapter, and safely mount it, get the info off of it, and return the drive?
...
2
votes
1answer
323 views
Btrfs on top of a mdadm raid10, or btrfs raid10 on bare devices?
I have a RAID10 managed by the mdadm and I have EXT4 filesystem on top of it. However, I like BTRFS and would like to convert the EXT4 filesystem to BTRFS, but I was thinking about performance and ...
2
votes
1answer
169 views
How to remove a drive from a non-standard 2-drive RAID 5 array?
There is some information available on shape changes in RAID arrays but I'm a little nervous and would like confirmation:
Problem: I have 2 500GB drive as software raid 5 (mdadm). I would like to ...
1
vote
1answer
229 views
CentOS - mdadm raid1 drive won't mount to default location
I'm running CentOS 5.5, the system, boot, swap, etc. is all on /dev/sda and I have two identical single-partition drives /dev/sdb1 /dev/sdc1 that are configured in RAID1 (using mdadm). It was working ...
2
votes
2answers
1k views
How-to change the name of an MD device (mdadm)
Here is the output from mdadm -Esv:
ARRAY /dev/md127 level=raid0 num-devices=2 UUID=d89d9d45:9a420812:c44c77eb:7ee19756
devices=/dev/sdb8,/dev/sda8
This is a v0.90 array. The question is as ...
0
votes
1answer
396 views
determine chunk size of an existing raid array
What should I do to determine chuck size of existing raid arrays. I'm using software raid created by mdadm.
I've been probing around for a while and can't find the right utility to that job.
mdadm ...
4
votes
1answer
216 views
Is it safe to put harddisks of a md-software-raid to standby?
I have a home-fileserver with 6 desktop harddisks in a md-raid.
The server isn't accessed a lot, so I think it would be good for the harddrives to go in standby-mode after some idle time (e.g. with ...
2
votes
0answers
461 views
Ubuntu mdadm RAID 10 performance on Atom D525 [closed]
I am thinking about moving my 2 x 2TB drive software (mdadm) RAID 1 to a RAID 10 setup. I have been reading online and it looks like RAID 10 has good performance and redundancy.
I currently have the ...
2
votes
2answers
60 views
What would you see if you tried to mount a single drive from a RAID 5 Array?
The title pretty much sums it up - if someone were to mount a single drive from a software RAID 5 array, what would they see? Would it point to being part of a RAID array, appear as encrypted data, or ...
0
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2answers
634 views
Adding drives to a RAID 10 Array
How would I grow a RAID10 array using mdadm?
Obviously I would need to add 2 drives at a time, or would it have to be 4 drives?
I have a feeling its just a bad idea.
Or would be just wiser to just ...
1
vote
1answer
375 views
Recover Linux software RAID5 array after server upgrade
I recently upgraded a server from Fedora 6 to Fedora 14. In addition to the main hard drive where the OS is installed, I have 3 1TB hard drives configured for RAID5 (via software). After the upgrade, ...
4
votes
1answer
3k views
How can I make mdadm auto-assemble RAID after each boot?
I successfully created a RAID (mirroring) by utilizing mdadm. However, I must run the following commands after each boot:
mdadm --stop --scan // to stop /dev/md127 - I don't know where the number 127 ...
1
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0answers
185 views
Lots of fun problems with RAID and SATA controllers
I bought a used 3ware raid card off of ebay a few months back and set up four 1TB caviar blacks in RAID5. The hardware raid could only manage about 5MB/s writing without write caching, and I don't ...
2
votes
1answer
168 views
Recover from failed recovery of software RAID5 failure
I have the pleasure ;-) to have been handed the task to try to get data off a server that had a RAID5 array problem and a failed attempt to recover it.
Background: the computer in question is some ...
0
votes
1answer
446 views
mdadm raid-1 after restarting usb devices not accessible anymore
Is my mdadm software raid in danger of data loss???
My both two new built raid-1 on external usb disks behave strangely.
Both were fine and rebuilt and cat /proc/mdstat showed
Every 10,0s: cat ...
0
votes
1answer
425 views
raid-1: increase rebuild speed on current rebuild
I see my raid-1 array rebuilding (first time after adding 2nd partition) and want to increase speed
SO I set
echo 100000 > /proc/sys/dev/raid/speed_limit_min
echo 400000 > ...
2
votes
3answers
108 views
Can RAID5 drives be defective while passing self-tests?
I have a 4-drive RAID5 in Ubuntu 10.10 with mdadm. One of the disks seems to be problematic. It dropped from the RAID, and I re-added it and it was fine for a while, but now when I re-add it I get a ...
6
votes
3answers
1k views
Raid1 with active and spare partition
I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters).
One of my disks (sdb5) reported I/O errors and was ...
1
vote
1answer
714 views
Auto-rebuild RAID6 with MDADM
I have an openSUSE 11.3 Linux computer with 5 disks of 1TB (WD enterprise disks) in it. With mdadm I configured a RAID6 device.
Now, after a lot of thorough testing, I've noticed that when the ...
1
vote
1answer
170 views
convert full-disk RAID5 array to partition-based array?
I have a RAID 5 array, md0, with three full-disk (non-partitioned) members, sdb, sdc, and sdd. My computer will hang during the AHCI BIOS if AHCI is enabled instead of IDE, if these drives are plugged ...
6
votes
4answers
2k views
mdadm volume works, but won't assemble/mount on startup?
I have an mdadm/lvm2 volume with 4 HDs that I created in Ubuntu 10.04. I just upgraded the computer to Ubuntu 10.10.
I redid the mdadm commands to get volume up and running, did mdadm --detail --scan ...
1
vote
3answers
206 views
Fluctuating transfer speeds with md RAID5/vsftpd
I have an Ubuntu 8.04.4 server with an md RAID5 consisting of 9 drives. While transferring a large amount of data to it (through vsftpd) I noticed very bad transfer speed fluctuation.
For example ...
0
votes
1answer
458 views
mdadm device missing
after a reboot my /dev/md0 device was missing. This is a RAID-1 array from two partitions of two harddrives. On each of the harddrives is another partition, which together belong to dev/md1. However, ...
2
votes
1answer
454 views
how can fsck to recover from hardware failure?
I have a RAID 5 array using mdadm and ext4 as its filesystem. We got a strong power surge and one of the drive faulted, while another one got a bit flakky, aka "click of death".
I replaced the disks ...
1
vote
0answers
236 views
Paritions “appear” in my raid 1 array after reboot, and the partitions in the array have changed names
I am moving my Ubuntu install to lvm over raid 1. I created the arrays with only 1 disk initially, planning to add the second disk later. I got the files moved and the system booted up succesfully on ...
2
votes
1answer
1k views
Possible mdadm RAID states?
I'm writing a monitoring plugin for a home server RAID, mdadm on Ubuntu 10.4.
Using sudo mdadm --detail /dev/md0
I get output like this:
/dev/md0:
Version : 00.90
Creation Time : Thu Dec ...
2
votes
1answer
159 views
Gentoo Linux -> Ubuntu: Can I Preserve My LVM/RAID Devices, Or Do I Need To Reformat?
I've got a Gentoo box that I'm interested in switching over to an Ubuntu box.
I currently have the partitions laid out using a mixture of RAID (mdadm) and LVM2, as specified in this document [1].
...
2
votes
3answers
767 views
RAID-1 and regular drive removal (using RAID-1 as a backup measure)
Is using mdadm's RAID-1 of 2 partitions (one on laptop's internal HDD, one on external HDD) a good idea.
I want the system to work as RAID-1 if both drives are present, work as regular volume ...
13
votes
7answers
20k views
How to get an inactive RAID device working again?
After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it.
* Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0.
# mount ...
5
votes
3answers
5k views
Creating a RAID1 partition with mdadm on Ubuntu
I'm trying to set up a RAID1 partition on my Ubuntu 9.10 workstation.
On this dual-boot system, Ubuntu is running from a separate drive (/dev/sdc - an SSD that is quite small, which is why I need ...
2
votes
2answers
511 views
Linux drive permissions for disk used by two systems
I've got a large mdadm-based RAID5 array that I've been using with an Ubuntu 8.04 system. I'm setting up a new 9.10 (alpha 6) system on the same hardware. mdadm does a great job automagically ...
