0
votes
0answers
20 views

mdadm: can't remove broken drive from raid1

I have a ubuntu server Ubuntu 12.04.5 LTS (GNU/Linux 3.2.0-34-generic x86_64) that uses a software raid with 2 physical drives. Apparently, one drive is unresponsive, and I try to remove it from ...
1
vote
1answer
51 views

Disabling damaged RAID 1 to read from healthy HDD

One of the HDDs in my software RAID 1 on a dedicated server is damaged. The customer support is slow to respond. I would like to transfer all data I need to another server, but file access is ...
1
vote
1answer
13 views

MDADM - Raid 1 - Change a disk with a smaller one

I have a Ubuntu server with the operating system installed on a raid1 created with two 500GB devices. the second drive failed. I now how to replace it, but my goal now is to move the operating system ...
2
votes
1answer
110 views

Cannot install grub, segmentation fault, unable to identify filesystem, superfluous RAID member, found two disks with same index — Debian 7

A server was recently transported from location A to B, a long journey that took six months. Things have gone wrong due to nothing being labeled prior to shipment. Yes, I know --- it was done by ...
0
votes
0answers
23 views

mdadm - unable to reconstruct the raid1

When restarting my server, it (sometimes) fails to reconstruct my RAID-1 array (2 disks). My server, a 10-year-old computer, often changes sda into sdb or sdc which seems to annoy mdadm. When it ...
0
votes
0answers
21 views

Resizing a software RAID remotely, no LVM, / partition

I have a server that has a software RAID without LVM. That is only mdadm. There are the partitions /dev/sda2 and /dev/sdb2 which form /dev/md2. There is also a lot of space after both /dev/sda2 and ...
0
votes
0answers
50 views

mdadm RAID0 array recovery

I have a Linux file server with two 12-disk MD1000 disk arrays attached to a RAID controller. Unfortunately, a power blip has caused a loss of configuration data on the RAID controller and it is now ...
0
votes
0answers
34 views

mdadm reattached a failed drive all by itself

I have 2 drives setup in mdadm mirroring (3 partitions on each drive). Last week the second drive (sdb) dropped out of the array because of some I/O errors I am still investigating. After a server ...
0
votes
1answer
24 views

External bitmap concerns

I am considering adding an external bitmap to my mdadm RAID6. The benefits seem absolutely incredible in terms of rebuild time but I do have some concerns. I didn't plan for it so I don't have much ...
1
vote
2answers
67 views

Should I partition a RAID or just create a file system on it? [duplicate]

Given a RAID 6 created from 6 drives /dev/md0 which should be used fully for data (no booting from it, root and swap are on a different drive), should I create one partition on that device and then ...
2
votes
1answer
733 views

Unable to mount '/dev/sda'

My server has two 2 TB hard disk drives in soft RAID 1. I can't mount /dev/sda. Output of parted -l root@rescue:~# parted -l Model: ATA HGST HUS724020AL (scsi) Disk /dev/sda: 2000GB Sector size ...
3
votes
2answers
809 views

Mdadm won't create an array larger than 10TB

I have a server with six 4TB drives running Ubuntu 14.04 LTS. One of the drives is used for the system/OS I wanted to use the other 5 drives to get as close to 20TB of storage as possible It's a ...
-1
votes
1answer
52 views

mdadm reports faulty disk, but smart doesn't find problems

I've got a 9 disk raid 5 array. Today i got a mail from my server: This is an automatically generated mail message from mdadm running on Eldorado A Fail event had been detected on md device ...
2
votes
1answer
54 views

MD RAID sector repair

This article states that RAID controllers are smart about unrecoverable read errors, and try to rewrite such sectors with the redundancy of the component drives. If the sector is bad, the disk's ...
0
votes
0answers
65 views

mdadm: All RAID disks look good, but can't access devices

Now, granted, issues with RAID rarely come up (at least with the one that I have to deal with in my life), so I'm not the most experienced person in the world. However, I'm not seeing any issues with ...
1
vote
0answers
652 views

Ubuntu 14.04 mdadm issues on boot

I have a 14.04 Ubuntu machine which has: 2 x SSD in RAID 1 (md0) 3 x Sata HDD in RAID 5 (md1) The machine is set to boot from the md0 device. This machine has been running fine for a month or so, ...
0
votes
1answer
67 views

mdadm array is active but is not listed

I am running Ubuntu Server 12.04. I did apt-get upgrade and received a warning from mdadm. update-initramfs: Generating /boot/initrd.img-3.11.0-24-generic W: mdadm: the array /dev/md3 with UUID ...
0
votes
1answer
161 views

Reconstructing the disk order in RAID 6 with 7 disks

a little background to this question first: I am running a RAID-6 within a QNAP TS869L external RAID/NAS system. I started with 5 disks of 3 TB each back in the day, and later added another 2 disks of ...
0
votes
1answer
33 views

Raid1+0: create stripe over two /dev/mdx on partition or not?

Given that I haven't found a way to define how a Raid10 is created with mdadm, i went the Raid1+0 solution. How to display/define Mirror/Stripping pairs with mdadm mdadm --create /dev/md0 --level=1 ...
1
vote
1answer
106 views

How to display/define Mirror/Stripping pairs with mdadm

I want to make a standard linux software Raid10 over 4 HDD. The server has 4HDDs, 2 pairs from different vendors in order to avoid batch problems. I want to have the mirror over two different ...
1
vote
0answers
92 views

Upgrade Raid 1 to Raid 0+1 and bootloader issue

I am trying to convert my current RAID 1 to RAID0+1 and facing issue in installing bootloader - please have a look what i am doing. My current configuration is RAID1(2*10GB): [root@localhost ~]# ...
1
vote
2answers
2k views

mdadm Boot Error, incrementally starting raid array Ubuntu SErver 14.04

i build a small Server with Ubuntu 14.04 for Samba, I has one SSD Drive (the ubuntu installation is on it) and 2 3TB SATA Disk, the sata disk are combined to a Raid 1 with mdadm. Now sometimes (no ...
0
votes
0answers
123 views

Software RAID: file system becomes read-only, mdadm fails with SEGFAULT

I have software RAID1 on Ubuntu 10.10 (Linux ubuntu 2.6.35-32-generic-pae). It is dedicated server I control via SSH. Yesterday datacenter people changed one HDD which was crushed. I did not run ...
0
votes
1answer
96 views

mdadm RAID 1 config deleted

one of our huge production servers crashed this morning due to a HDD failure on port 0 (the bootable one). That server was running CentOS 6.5 in RAID 1 with mdadm. Although, a trainee changed the HDD ...
4
votes
1answer
466 views

CentOS 6.5 mdadm Raid 1 - Kernel Panic during raid data check

I have a brand new CentOS 6.5 install with two (mounted to /mnt/data) 1tb Western Digital Black drives in raid 1 with mdadm, configured via the installer. Unfortunately every now and again the entire ...
0
votes
2answers
163 views

Is mdadm RAID Toast?

I took all my drives out and put them onto a new cpu/mobo. (upgrading) I boot up and mdadm claims it can't boot my degraded RAID. /dev/sdb sudo mdadm --examine /dev/sdb /dev/sdb: ...
2
votes
0answers
91 views

RAID1 disks “forked”, now duplicate

I have got a server hosted by OVH, which is configured to have a soft RAID1 array, /dev/md0, that holds a LVM PV. There is another /dev/md1 array, which was supposed to be the /boot, but which is ...
1
vote
0answers
1k views

How to recover an mdadm array on Synology NAS with drive in “E” state?

Synology has a customized version the md driver and mdadm toolsets that adds a 'DriveError' flag to the rdev->flags structure in the kernel. Net effect - if you are unfortunate enough to get a array ...
0
votes
0answers
105 views

mdadm array fails to start at boot, bad superblock on component drive

At boot my mdadm raid5 array fails to start, saying that one of my disks (sdi) has a bad superblock. However, once I log in, I can start the array no problem with mdadm --assemble /dev/md0 ...
1
vote
2answers
352 views

How do I fix my server to boot properly after removing / adding a drive on my mdadm software RAID

I configured a RAID-5 array for a data partition mounted on /mnt/data. My system is not booting on it (/ and /boot is on a dedicated drive not part of any RAID array). I added a 4th drive to my 3 ...
2
votes
1answer
148 views

mdadm raid10 or nfs performance issues?

I have a fresh mdadm RAID10 device which is healthy, built from 4 x 7200rpm SATA 3 drives: # cat /proc/mdstat Personalities : [raid10] [raid1] md2 : active raid10 sdc3[5] sda3[4] sdb3[1] sdd3[3] ...
2
votes
0answers
279 views

mdadm error: found two disks with the number 0

Im running a server deep in the forest , and after a hard disco failure i got this error. error: found two disks with the number 0. It a server with 2, 1 TB disc in raid 1 with mdadm 0.9 SDA failed ...
2
votes
1answer
35 views

MDADM RAID5 Size

I currently have 9x1TB disks in RAID5, which to me is 8TB worth of storage. However, I am not getting that at all. This was after moving from RAID6 to RAID5 and performing the necessary commands to ...
3
votes
1answer
121 views

RAID-5 array being split on reboot (ubuntu)

I've set up a RAID-5 array on Ubuntu 13.04 (kernel 3.8.0-27-generic) using mdadm - v3.2.5 - 18th May 2012. It appears to work fine and be in high spirits: $ cat /proc/mdstat Personalities : ...
0
votes
0answers
21 views

Harddrive check going-on?

I have a server that has suddenly become unusable (responds very slowly to requests). It seems to be related to some on-going RAID check. Here is what I get when I run cat /proc/mdstat : ...
1
vote
2answers
86 views

Check health of RAID array

I have a server with RAID 1. Currently when I type in the following command: cat /proc/mdstat I get: Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty] ...
1
vote
1answer
225 views

Is it safe to snapshot an mdadm RAID with only xfs_freeze?

Is mdadm guaranteed (and trusted via experience) to be safe for taking snapshots with only an xfs_freeze? I have encountered vague warnings about mdadm still working in the background, thus making ...
0
votes
1answer
31 views

mdadm grow operation giving nonstop libata errors

Running Debian 7, mdadm 3.2.5. I issued a command to grow a 5 disk, 3 spare raid 5 array to an 8 disk, 0 spare raid 6 array: mdadm --grow /dev/md0 --level=6 --raid-devices=8 ...
0
votes
1answer
620 views

How to delete removed devices from a mdadm RAID1?

I had to replace two hard drives in my RAID1. After adding the two new partitions the old ones are still showing up as removed while the new ones are only added as spare. I've had no luck removing the ...
3
votes
1answer
717 views

flashcache with mdadm and LVM

I am having trouble setting up flashcache on a system with LVM and mdadm, I suspect I am either just missing an obvious step or getting some mapping wrong and hoped someone could point me in the right ...
1
vote
2answers
168 views

Path of md device wrong after reboot

I have to set up a software raid (level1) on a Ubuntu server 12.04. It should serve files in the network via Samba. The server has the following disks: 250gb Sata hdd (Ubuntu is installed on that ...
2
votes
1answer
376 views

linux raid 1: right after replacing and syncing one drive, the other disk fails - understanding what is going on with mdstat/mdadm

We have an old RAID 1 Linux server (Ubuntu Lucid 10.04), with four partitions. A few days ago /dev/sdb failed, and today we noticed /dev/sda had pre-failure ominous SMART signs (~4000 reallocated ...
1
vote
1answer
118 views

Expanding raid 5 luks partition

I have just bought 2 new drives to my raid 5 array. I have successfully added them to the array and resynced. I now have a /dev/md4 drive that is 16 TB, but the crypt-luks partition md4p1 is still 12 ...
0
votes
2answers
689 views

Fedora, fsck fails at boot

I'm facing a problem in my server during the startup. This is my actual configuration: 320GB each. Raid1 -> /dev/md127. Working. /dev/sda /dev/sdc 1000GB each. Raid1 -> Use to be /dev/md126, ...
-1
votes
2answers
81 views

What is the correct way to create new raid5 in Linux?

I added some new disks, and tried to create new array, using: mdadm --create /dev/md/2 --level=5 -x 0 --raid-devices=4/dev/sd{a,b,c,g}2 It creates the array, but after reboot - it's gone. What ...
1
vote
2answers
222 views

M1015 pass-through and hot-swap in Linux with md raid (IBM x3620)

I'm setting up a small, but hopefully durable server for a student community, and the hardware is an IBM x3620 M3 with a builtin M1015 RAID card. To make the setup future proof and avoid vendor ...
0
votes
1answer
918 views

RAID Recovery on a QNAP TS-869U-RP

I've had my trusty QNAP NAS (T869-RU) fail on me over night with (apparently) two of the eight disks in the RAID5 MDADM array from /proc/mdstat: [/etc] # cat /proc/mdstat Personalities : [linear] ...
1
vote
1answer
497 views

How do I check if smartd and mdadm are running correctly?

I have a raid system on debian: Disk /dev/sda: 320.1 GB,... Device Boot Start End Blocks Id System /dev/sda1 * 1 2432 19535008+ fd Linux raid ...
4
votes
1answer
280 views

Rebuild mdadm RAID5 array with fewer disks

I have a 4 disk RAID5 array, one of which is starting to fail according to smartd. However, since I'm using less than half the space on /dev/md0, I'd like to rebuild the array without the failing ...
1
vote
1answer
934 views

Linux - dmraid (or mdadm) - Rebuild RAID 10

A while ago I had a raid10 config crap out on me, and am now just getting around to trying to salvage the array so I can rebuild and move on with my life. Basically a drive in each subset failed, ...