0
votes
1answer
31 views

Use old raid drive as boot device without data loss

There were two disks in sw-raid. There were /dev/md1 as swap, /dev/md2 as boot and a /dev/md3 with ext4. The sw-raid was disabled by stopping and removing mdadm and then zeroing the superblock on ...
0
votes
1answer
74 views

CentOS System Recovery : Overwritten RAID Superblock and porting to new hardware

I have a failed system running on CentOS 6 and would like to attempt recovery of system. One problem it has is the mdadm superblock appears to have some issues, it has all sorts of inconsistent ...
0
votes
1answer
57 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
371 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 ...
2
votes
0answers
415 views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
0
votes
1answer
119 views

Saving data on a failing software RAID 1 setup

My CentOS 6 server is running a software RAID 1 configuration with two 1 TB disks. Yesterday trouble started happening when the server was very irresponsive. I checked the logs and noticed a whole ...
1
vote
1answer
630 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, ...
2
votes
3answers
187 views

mdadm raid1, drive failure lost 14days worth of data?

I am rather confused. One evening I had a server which had died. I went to reboot it and noticed it was stuck on the "GRUB" boot screen. I then noticed a hard drive had failed. I put a new hard drive ...
1
vote
1answer
3k views

mdadm mdadm: cannot open /dev/sda1: Device or resource busy

I am having trouble going from a single disk to raid 10 The command issued is: mdadm --create /dev/md0 --level=10 --raid-devices=8 /dev/sd[abcdefgh]1 The output is: mdadm mdadm: cannot open ...
4
votes
2answers
1k views

mdadm raid 1 grub only on sda

I just finished setting up a CentOS 6.3 64bit server with mdadm however a lightbulb went on and I realised grub would only be installed on the first drive which is about as much use and an ashtray on ...
1
vote
1answer
262 views

Linux software RAID 10 array, failed drive, resize file system and migrate to a 3 drive RAID 1?

I have a software RAID 10 array which I recently noticed went into a degraded state. The OS is CentOS 5.8. It has 4x 500GB drives in 3 different arrays: /dev/md0 is RAID 1 and mounted to /boot (200MB ...
1
vote
1answer
561 views

How to detect hard disk failure?

So, one of my servers has a hard disk failure. It's running software RAID, the system locked up and according to /proc/mdstat (and /var/log/messages), it's really down: Personalities : [raid1] md2 : ...
1
vote
1answer
487 views

raid10 in mdadm reports incorrect “Used Dev Size”

I previously had a raid5 with mdadm using four 2TB drives. I've recently disassembled the raid and created a raid10 with six 2TB drives, but mdadm --detail is showing "Used Dev Size" as only 2TB (the ...
3
votes
1answer
458 views

Software RAID1 ready to fail - How can I degrade manually?

I have a Centos 5.4 server in production with 2 drives in software RAID1. The last days /var/log/messages has a lot of messages, showing that one of the drives is ready to fail: Sep 23 00:48:38 ...
0
votes
3answers
351 views

How to add existing /home on MDADM RAID to new LVM based OS install

Have (32-bit) Centos 5.6 file server with 2x1TB HDD/ext3 in MDADM RAID-1 as follows: Disk /dev/sda: 1000.2 GB, 1000204886016 bytes Device Boot Start End Blocks Id System ...
1
vote
4answers
4k views

mdadm puts wrong devices in array on boot Correct mdadm.conf file

Upon boot it stuffs it up every time: [root][centos ~] cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md127 : inactive sda[2] sdb[3] 1953524992 blocks unused devices: ...
0
votes
1answer
166 views

Partition Centos | Raid

I have 4 HDD, the system is installed on /dev/sda2 # df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 884G 2.1G 836G 1% / /dev/sda3 2.0G 159M 1.7G ...
1
vote
2answers
239 views

Re-assembling the RAID-5 array reboots my CentOS-5 machine

I have 3 HDD's, each divided into 3 partitions. I had created a RAID-1 for boot partition md0 created from sda0, sdb0 and had also created two RAID-5 arrays: md1 created from sda1, sdb1, sdc1 ...
2
votes
1answer
495 views

How long should the initial creation of my RAID 5 Array take? This seems ridiculous

I'm building a raid 5 array with 3 1.5TB drives on CentOS 5.5 using mdadm. Everything seems to be working fine, except it's taking forever and I'm not sure if that's normal. It's going on 6 hours ...
2
votes
5answers
1k views

Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm ...
3
votes
3answers
1k views

Is mdadm Raid-1 Over A Network File Share Possible?

I am using 64bit CentOS 5.5 I know it's possible to set up software RAID1 using mdadm using a physical hard disk and a RAM disk. Is it possible to set up software RAID1 with mdadm using a NFS mount ...