The mdadm tag has no wiki summary.
1
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2answers
30 views
Raid array on partition bleeds through to block device
EDIT: It appears that this might be an inherent issue with the .9 superblock version. Figures that I would only be able to find these links after I posted here.
...
3
votes
1answer
40 views
Linux mdadm software RAID 6 - does it support bit corruption recovery?
Wikipedia says "RAID 2 is the only standard RAID level, other than some implementations of RAID 6, which can automatically recover accurate data from single-bit corruption in data."
Does anyone know ...
-3
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0answers
105 views
0
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2answers
40 views
mdadm raid5 too slow when writing
I have set up a RAID5 array using 4 disk partition. All disks are 2TB. When the RAID5 array was initially syncing it was too slow. So I did a
echo 32768 > /sys/block/md2/md/stripe_cache_size
and ...
0
votes
0answers
24 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
56 views
strange mdadm behavior - on failing to create, md127 appears with “Device or resource busy” on freshly created partially zeroed partition
Problem:
# ls /dev/md*
/dev/md0 /dev/md1
# dd if=/dev/zero of=/dev/sdb3 bs=1M count=1
# dd if=/dev/zero of=/dev/sdd3 bs=1M count=1
# mdadm --zero-superblock /dev/sdb3
# mdadm --zero-superblock ...
4
votes
1answer
476 views
Ubuntu server, gpt partition table, mdadm, grub boot fail
Basic working system details:
I used the Ubuntu 12.04 server CD to install a server.
I have 4 disks. On all disks I did the following, similar to this howto :
created a 2GB swap partition
created ...
0
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0answers
120 views
Can't mount logical volume, RAID/MD/LVM problems
I have a file server with 48 2TB HDDs split across 2x 3ware 9650SE-24M8 RAID cards. Both cards have 24 drives in RAID 1+0. MD softraid is setup in raid 0 with the two RAID 1+0s making RAID 100. LVM2 ...
1
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0answers
150 views
MDADM not able to connect to EBS drives on Ubuntu 11.10
I have been using a raid.sh script [1] for over a year now and has never gave me trouble. I recently started moving from Ubuntu 10.04 machines on AWS to Ubuntu 11.10. I updated the raid.sh script from ...
2
votes
1answer
179 views
mdadm warning after apt-get upgrade - can't boot RAID
I'm running Ubuntu 12.04 precise. A recent apt-get upgrade ended successfully, but printed the following warning at the end:
update-initramfs: Generating /boot/initrd.img-3.2.0-21-generic
W: mdadm: ...
-1
votes
1answer
51 views
Does linux software raid10 perform any data verification on each write?
I wand to find out is there any benefit in safety of storage data between manual sync(using cron & rsync) of two RAID0 volumes and RAID10 volume using Linux software raid. Does RAID10 preform any ...
2
votes
3answers
109 views
Can I convert a raid10 array to raid0?
I have created a raid10 array using mdadm. Metadata version is 1.2. I want to convert this to a raid0 array, is it possible?
P.S. I am having terabytes of data, I want to avoid copying the data over.
...
4
votes
1answer
99 views
How to force mdadm to use udev device names rather than /dev/sdX
The question is mostly in the title already.
mdadm and /proc/mdstat insist on listing md members by their "traditional" /dev/sdX names.
What I want is for them to use the newer udev device names ...
1
vote
1answer
265 views
Build and migrated to software raid (mdadm) on GPT disk, now can't assemble array
mdadm, gpt issues, unrecognized partitions.
Simplified question: How do I get mdadm to recognize GPT partitions?
I have been attempting to convert/copy my Ubuntu 11.10 OS from a single drive to ...
2
votes
0answers
118 views
MD Raid can't be assembled
I was running a Raid5 with 3 disks at on my homeserver. But had some problems with the back-plane for the disks. The disks weren't detected reliable. So I replaced the back plane and the disks are now ...
1
vote
2answers
155 views
Cant boot newly created mdadm software raid in Debian linux squeeze
Hello I have very strange problem creating swraid on Debian Squeeze Linux. I started creating RAID1 from existing standard instalation of Debian on single drive.
So I bought new drive and started ...
2
votes
2answers
75 views
mdadm failure detected on one partition
I received this rather nice email today suggesting one of the drives in a RAID1 array has failed.
A Fail event had been detected on md device /dev/md4.
It could be related to component device ...
1
vote
2answers
89 views
Relabeling of filesystems (SELinux) fails
After compiling the policy modules and re-compiling my core packages (Gentoo 32bit) I wanted to relabel the filesystems (via rlpkg -a -r) and packages but I get these error messages:
Relabeling ...
2
votes
2answers
223 views
Move an existing RAID 5 array from Ubuntu to Gentoo
I have a 64-bit Ubuntu machine with a 4-disk RAID 5 using software raid (md). I've been able to boot an Ubuntu LiveCD and recognize the array with a simple mdadm -A /dev/md0. It was easy to mount ...
1
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0answers
125 views
mdadm raid1, [1/2] disks failed, safe to reboot?
I am seeing the following under /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sda2[0](F) sdb2[1]
976554876 blocks super 1.1 [2/1] [_U]
bitmap: 4/8 pages [16KB], 65536KB chunk
md0 : active ...
2
votes
0answers
200 views
How do I create a RAID10 array using EBS on Amazon?
Basing this question on information I got in Why does df shows only half the size of a RAID10 array?,
how should I create a RAID10 array using EBS volumes on Amazon, in a way that will not be ...
1
vote
0answers
77 views
After upgrade to SLES11 SP1 - LVM on top of software RAID5 not working anymore
On a system where I have been running OpenSuSE11.1 for some time I performed a fresh installation of SLES11 SP1. The system used a software RAID5 system on top of which an LVM was setup with a single ...
4
votes
2answers
190 views
apt-get update mdadm scary warnings
Just ran an apt-get update on one of my dedicated servers to be left with a relatively scary warning:
Processing triggers for initramfs-tools ...
update-initramfs: Generating ...
1
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0answers
105 views
mdadm: hot remove failed for…
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 /):
...
2
votes
1answer
82 views
get mkfs.xfs options from existing xfs filesystem
I set up a new server last week, did some testing with different mkfs.xfs options on mdadm raid5, i finally found some statisfying mkfs options.
Now i am about to set up a new server having exactly ...
0
votes
0answers
94 views
Installing LILO to software-RAID1 with failed item
Item /dev/sda1 of software RAID1 /dev/md0 has gone to a better world. md0 is mounted to a root / directory, and it contains /boot directory.
My lilo.conf configure is
boot=/dev/md0
root=/dev/md0
...
2
votes
0answers
41 views
mdadm LBA mapping
I am trying to write a script similar to mdtrim (https://github.com/Cyberax/mdtrim) for a raid 0 software raid through mdadm. The mdtrim is for raid 1 only at the moment, and it works by writing a ...
4
votes
1answer
80 views
Debian installation on software RAID (lilo.conf configuration)
Debian installation program has created lilo.conf:
boot=/dev/md1
root=/dev/md1
raid-extra-boot=mbr-only
But when i configure lilo i usually put these lines
disk=/dev/md1
sectors=63
heads=255
...
1
vote
1answer
217 views
How to disable mdadm when running hardware RAID
My server Dell R210 runs a Debian squeeze with hardware RAID1 (H200) preconfigured. But I notice that there is mdadm running. Sometimes in backup, or in OS upgrade (to Debian 6.0.4), I have messages ...
0
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0answers
119 views
Rebuilt md raid 6 array now showing xfs errors. How bad is it?
We had a storage server with performance starting to be poor. When I installed Linux's smartutils, it found
Device: /dev/sdm, 2 Offline uncorrectable sectors
Since this was a rather large raid6 ...
0
votes
1answer
71 views
Virtualbox VM crash when checkarray runs
I have a VM running in Virualbox 3.2 on Debian 5.
The host has 2 drives in raid 1. In the last 5 times the checkarray ran the vm crashed 4 times. Every single time right after mdadm finished checking ...
5
votes
1answer
112 views
Use cases for “mdadm --create” vs. “mdadm --build”?
From the mdadm man page, --build section:
This usage is similar to --create. The difference is that it creates a legacy array without a superblock.
^^ So no superblock with --build. 10-4. ...
0
votes
1answer
186 views
Cryptsetup device /dev/md0 is not a valid luks device
After reinstallation of my OS, I decide to manually assemble a RAID6 array.
# mdadm --assemble --auto=yes --scan=auto /dev/md0
I don't exactly remember a message but programmdadm return a resizing ...
20
votes
2answers
2k views
Recover RAID 5 data after created new array instead of re-using
Folks please help - I am a newb with a major headache at hand (perfect storm situation).
I have a 3 1tb hdd on my ubuntu 11.04 configured as software raid 5. The data had been copied weekly onto ...
0
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2answers
374 views
Creating a partitioned raid1 array for booting a debian squeeze system
I'd like to have the following raid1 (mirror) setup:
/dev/md0 consists of /dev/sda and /dev/sdb
I created this raid1 device using
mdadm --create --verbose /dev/md0 --auto=yes --level=1 ...
0
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0answers
70 views
how to migrate lvm mirrorlog from physical partition
Output from: sudo lvs --all -o +devices
root hp03 mwa-ao 18.62g root_mlog 100.00 root_mimage_0(0),root_mimage_1(0)
...
0
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2answers
261 views
Linux: very slow mdadm resync on raid 1
I'm trying to rsync a RAID 1 on a system with absolutely nothing running ( i've moved all services to another server ). So it's just me via ssh. For some reason, it's very slow:
cat /proc/mdstat
...
3
votes
1answer
211 views
Slow md RAID-1 array
We have some problems with very slow disk response on our server. I checked iostat (iostat -d -x 30) and have some problems with its interpretation:
Device: rrqm/s wrqm/s r/s w/s ...
4
votes
1answer
97 views
Recovering linux software RAID array without removing it's items
I have linux software raid (RAID10),
md2 : active raid10 sda6[4](F) sdd5[3] sdc5[2] sdb6[1]
390620160 blocks 64K chunks 2 near-copies [4/3] [_UUU]
which has degraded state. Can i start recovery ...
1
vote
1answer
442 views
Ubuntu EC2 Raid0 Ephemeral — SSH connection after reboot
First, I launch a fresh large instance using the Elestic AMI ami-c162a9a8. Initially, I run:
df -h
/dev/xvda1 9.9G 814M 8.6G 9% /
udev 3.7G 4.0K 3.7G 1% /dev
...
0
votes
1answer
56 views
Debian MD software nested RAID0+1 autoassemble issues [closed]
I'm starting out with software RAID on Linux and hit a roadblock when using a nested RAID schema. I have three small disks that I'm RAID0ing, and then RAID1ing with a partition on another larger HDD. ...
0
votes
3answers
122 views
Linux software raid robustness
I have a 4 disk 5TB raid5 setup where a disk is showing signs of going down the drain. It is reporting media errors and from dmesg I can see that several read errors are corrected. smartctl does ...
2
votes
1answer
249 views
Ubuntu Server mdadm drbd ocfs2 kvm hangs under heavy file reading
I have deployed four ubuntu 10.04 server. They are coupled two by two in a cluster scenario. on both sides we have software raid1 disks, drbd8 and OCFS2 and on top of it some kvm machines run with ...
3
votes
1answer
180 views
Unresponsive mdadm
I have a raid 5 mdadm raid array set up with 6 drives and a hot spare on an Ubuntu 11 server. There are a couple samba shares on the drive, and until today, they were working well.
A couple hours ago ...
0
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1answer
73 views
mdadm scheduled check [closed]
I now have several devices that start the monthly mdadm scheduled check. I can let them all run monthly, stagger the checks, or disable them completely. I had the misfortune of several disks turning ...
1
vote
0answers
109 views
Reassemble RAID 10 array without losing data
I have a RAID 10 array created from 4 iSCSI devices. This morning I temporarily lost connectivity to 2 of those drives. And it was long enough for mdadm to take them out of the array. Unfortunately ...
0
votes
1answer
175 views
Linux: Rebuilding MD-RAID 1 array when one drive has been out of array for awhile
About a month and a half ago I noticed that the two hard drives in a (OpenSuSE 11.3) server were dying. Guessing based off the SMART data, I replaced /dev/sdb first; to do this I removed the drive ...
3
votes
1answer
783 views
Why is my mdadm raid-1 recovery so slow?
On a system I'm running Ubuntu 10.04. My raid-1 restore started out fast but quickly became ridiculously slow (at this rate the restore will take 150 days!):
dimmer@paimon:~$ cat /proc/mdstat
...
1
vote
1answer
101 views
Linear mode to RAID 1 migration
Consider creating a linear mode RAID with single disk(more disks may be added later).
#echo y | mdadm --create /dev/md0 --level=linear --raid-disk=1 /dev/sda1 --force
Now consider another partition ...
3
votes
2answers
718 views
How to resize RAID1 array with mdadm?
I've running Ubuntu 11.04 (kernel 2.6.38-11). I replaced 2x160GB with 2x500GB drives. They are configured as RAID1.
The partition tables show the right sizes. Here's sfdisk:
# sfdisk -d /dev/sdb
# ...
