Questions tagged [software-raid]
RAID solution handled by the operating system.
881
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How to recover an Intel RAID 0 on a Rocks cluster distribution
We had a Rocks 5.5 distribution on our cluster and wanted to upgrade to 6.2. The "/export" partition was mounted on a Intel software RAID 0 array of 2 identical hard drives (HD) (/dev/sdb and /dev/sdc)...
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1
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Linux Software RAID10: Mysterious renaming /dev/md0 to /dev/md127: Why?
During the last two nights we had mysterious events on a server running Ubuntu Linux 12.04 LTS with a Linux mdadm software RAID10:
DeviceDisappeared /dev/md0
NewArray /dev/md127
Both messages ...
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1
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RAID 5 failure Ubutnu 12.04 not rebooting
I have Ubuntu 12.04 setup with software RAID 5. Dmesg started to show I/O errors continuously. I thought to reboot the system and lo and behold, it got stuck on
GRUB ERROR Loading 21
I then used an ...
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1
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mdadm set the mode before a second device raid1?
i have a problem. server use two disk softraid1. disk sda is die, and replaced disk. and reboot now, copy partition table sdb to sda ok. next step copy boot record sdb to sda ok. finaliy add sda in ...
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CentOS 6.6 - reshape of RAID 6 stopped
I have a CentOS 6.6 Server with 13 disks in a RAID 6. Some weeks ago, i upgraded it to 17 disks, two of them configured as spare. The reshape worked like normal in the beginning. But at 69% it stopped....
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0
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DRBD server not starting - error in creating netlink socket
I have a newly configured DRBD-Cluster 8.4.5 on 2 VM running ubuntu 14.04, following this example: http://geekpeek.net/configure-drbd-ubuntu/
Unfortunatelly I can not start the service. It seems to ...
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Remove Failed Drive in Windows Storage Pools
I am currently using Windows Server 2012 R2 with Windows Storage Pools
I have a virtual disk called "2T RAID" that is in Parity mode.
There are 8 - 2T hard drives in this virtual disk. Today one of ...
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2
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mdadm - RAIDs of partitions or partitions of RAID?
If using entire drives for an mdadm RAID which will be the boot device as well, is it more correct / standard to:
1) Configure the RAID out of partitions that encompass the whole drive (like /dev/...
- 1,338
3
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1
answer
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RAID1 - mdadm mirror - not performing parallel reads as expected?
We have a three-way RAID 1 mirror which is powered by mdadm. I think I read that mdadm is supposed to take multiple simultaneous read requests and distribute them across different drives in the ...
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1
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RAID1 write penalty using mdadm - what's the cause?
When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
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2
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How to tell mdadm to use a partition as/instead of a block-device?
I have four 500GB disks which were set up as a Linux Software-RAID 5 volume during the Debian install (next to the system drive which is a SSD). One of the drives (sda) went bad and now I am trying to ...
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1
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How/When to physically remove a failing harddrive after replacing it in a Linux RAID?
I have a Linux software RAID-1 with mdadm. Similar to this question ("How to safely replace a not-yet-failed disk in a Linux RAID5 array?"), I want to replace a disk in a the raid.
My question might ...
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postfix SMTP outgoing gateway server, Software RAID1 vs RAID1 + RAID 0 on 2 disks
I have this old smtp server that is currently running Windows 2003 and with EOL I want to move it to something that will continue to get security upgrades but at same time I want to improve ...
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1
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Is a partition necessary when using RAID?
I have configured raid1 on two of my disks. I am not using a partition, because I want to use the entire disk. Is this correct?
The command lsblk produces the following output for my disks:
sdc ...
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1
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RAID1: approx performance difference of 3 active vs. 2 + spare?
My question concerns only Linux software RAID ("md").
I'm going to set up a RAID1 array with three devices. I need to choose between using the third disk as a spare or as an active member of the ...
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2
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Diagnose RAID utilisation on a failed drive
I am facing a problem on a server I didn't install, the former guy isn't here anymore to explain me anything.
Some processes crashed due to what seems to be a disk failure, so I searched in the logs ...
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1
answer
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Mounting degraded RAID
I've finally managed to assemble my RAID10 array again. I'm hoping there might now be a way through this. (There is history, if anyone is interested).
I'm now getting:
# cat /proc/mdstat
...
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2
answers
7k
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mdadm, RAID5 all disks marked as spare, won't start
RAID5 config with mdadm and 4 disks
After some incidents, eg one of the drives was lost, had to reboot the server and rebuild the array, my raid is in a funny situation
cat /proc/mdstat
...
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0
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Mount a NTFS Raid0 disk under linux debian
In my new laptop I have a a RAID 0 configuration with a normal disk and a smaller SSD drive. I have removed the dvd bay and replaced the dvd player with a 256 GB SSD drive where I run linux debian. I ...
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MD RAID Array Often Starts Without All Drives
I find that, when I start/restart my system, my MD array often doesn't start with all of the drives even though the device-names haven't changed at all.
I'll have to stop the array and reassemble it, ...
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1
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184
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Can I stripe 2 volumes on the operating system drive?
I'm new to system administration and I'm not really sure if this is possible. Our server supports up to 4 x 2 TB drives. We need a drive larger than 2TB for a particular use. We also need redundancy ...
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Software RAID 1 does not extend on two new additional drives
I added two new devices two my software RAID 1 system. They are recognized by mdadm but I can't use the addition space.
Here is how I proceed:
I added the two new disk to my PC and created on each ...
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2
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How to run fsck on software raid's real hard disks?
When and how should this be run? Is it better to boot from a DVD-ROM and run fsck on each real hard drive? Or can this be done automatically after X number of mounts?
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Remove a drive from a 2-drive RAID 5 array using version 1.2 metadata?
My situation is nearly identical to "How to remove a drive from a non-standard 2-drive RAID 5 array?", except my 2 TB RAID5 is using mdadm super block version 1.2. According to the best answer, "...
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1
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Soft raid 1 slow (disk fail?)
I am running a server with Software Raid 1 and it is used solely for backup purposes using Idera/R1Soft. The last few days, the backups have been generated extremely slowly, so I am starting to wonder ...
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1
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How to add a harddisk back in raid10 array?
I have a harddisk that is out of raid array. I wanted to create the partition table on sda basesd on the sdb table and I issued this command:
sfdisk -d /dev/sda | sfdisk /dev/sdb --force
I know ...
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1
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0
answers
505
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One drive in Centos software raid 1 array keeps disappearing
I have a pair of HP DL320e servers identically configured with 2 x WD Red 6TB drives in a software raid 1 array.
# cat /proc/mdstat
Personalities : [raid1]
md126 : active raid1 sda3[2] sdb3[1]
...
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1
answer
121
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How do I prevent Windows from presenting software RAID discs as a single volume?
Here's my issue: I had a server's software RAID fail. I don't believe it's the hard drives, as they are brand new RE drives from Western Digital and the RAID software said that 2 dives had failed.
...
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0
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Unable to install grub to software Raid array in Ubuntu
How do you ensure Grub is properly installed on a software RAID array in Ubuntu?
I have a failed RAID array on an Ubuntu 14.04 server. When I first tried booting it, the Grub screen came up, but ...
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CoreOS on software RAID with EXT4 filesystem
I'm currently thinking about installing the CoreOS on a bare-metal server with two disks I want to put in a software RAID1.
The latest CoreOS is now using EXT4 as their default filesystem and I'm ...
user186340
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103
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How to diagnose RAID drive showing incorrect size
I have a software RAID1 array on Ubuntu 14.04. Each drive has 1TB, for a logical size of 500GB. Suddenly, one drive started reporting it only had 4.1GB and I can no longer run any SMART self tests on ...
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1
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750
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How to fix destroyed software RAID after Ubuntu upgrade
I upgraded a headless server from Ubuntu 12 to 14 following the built-in do-release-upgrade script. It seemed to run fine until I rebooted, and was left with an unusable machine. After the grub screen,...
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5
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mdadm 3-way RAID 1 - good solution for guaranteed 2-drive failure tolerance?
Is a 3-way RAID1 using mdadm a good solution to be able to sustain any two drives failing without the RAID failing? I know this costs extra in the sense of only being able to use 1/3 of the disk ...
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What are the Pros & Cons of Software RAID vs Hardware RAID of 4xSSD(512Gig) in RAID10?
I'm getting this server: Supermicro SuperServer 6018R-TDW
It comes with this motherboard: Supermicro X10DDW-i
I've decided going with 4xSSD(512Gb) in a RAID10.
My server is busy with a demanding ...
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0
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6k
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mdadm: activating spare and removing 'removed' disks
I added 1 disk to my raid array, started reshaping, and then remembered that I forgot to partition the drive.
So I partitioned and readded the disk. I'd like to get rid of that 'removed' and activate ...
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votes
1
answer
610
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Are my disks failing and causing high load on linux?
Today I did apt-get update && apt-get upgrade on Linux Ubuntu 12.04.5 LTS server. Everything went fine. Four hours later monitoring tools alerted me that disk I/O is overloaded. I/O wait has ...
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1
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mdadm: drive replacement shows up as spare and refuses to sync
Prelude
I had the following devices in my /dev/md0 RAID 6: /dev/sd[abcdef]
The following drives were also present, unrelated to the RAID: /dev/sd[gh]
The following drives were part of a card reader ...
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3
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In a software RAID1, why does tune2fs -c 0 /dev/sda1 not throw an error but change is not seen in tune2fs -l /dev/sda1?
The Title pretty much says it all.
Turn off mount count fsck seems to succeed:
tune2fs -c 0 /dev/sda1
tune2fs -c 1 /dev/md0
But listing out via
tune2fs -l /dev/sda1 shows mount count is set back to 1 ...
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Recover data from OpenBSD softraid down to a single disk
I'm currently very desperate: I have a 3TB WD Red disk that I need to extract data from.
This was part of a softraid on an OpenBSD 5.6 machine. I was in the process of migrating to a zfs on linux ...
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1
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How to fsck a partition that is part of a software Raid that again is part of a LVM volume group?
The faulty partition is /dev/sdb3.
from /proc/mdstat:
md2 : active raid1 sda3[2]
2896184639 blocks super 1.2 [2/1] [U_]
says /etc/fstab:
# /dev/md/2 belongs to LVM volume group 'vg0'
/dev/...
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XenServer 6.5 Software Raid
I try to install XenServer 6.5 with Software-RAID 1 at my home lab.
With XenServer 6.2 this setup ran stable for a few months (at the same hardware).
XenServer 6.5 installation went smoothly and ...
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Disk I/O at limit with software raid
whenever I use rm or cp on a bigger file structure the disk i/o is going up to the top, but not with the focus on cp or rm, it is the software raid sync. My knowledge in this area is limited. The ...
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1
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Repairing RAID6 with two drive issues mdadm
I have had two disk failures on my RAID6 array. I have added two new disks and did the following:
I ran mdadm /dev/md1 --remove on the two disks
I set up my RAID on the 1st partition of each disk (...
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1
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Best way to RAID 4 x Intel SSD 910 for PostgreSQL
I have a Linux (debian/ubuntu) server with 4 x Intel SSD 910 800GB pcie that I need to RAID together.
The biggest problem with these card is that they give you 4x200GB drives that you cant hardware-...
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0
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79
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Migrating linux (madm) RAID1 (mirror) to something else?
I have 2x 3TB in a mirrored RAID 1 volume. I would like to extend this to a 4x drive volume. I'd like to have 1 disk for redundancy.
I'm no IO/RAID expert, or madm come to that, but know enough to ...
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1
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203
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How to migrate RAID-6 from 5 disks to 4 disks while increasing disk sizes
I am having a quite complex problem and while I found solutions to individual steps (and already applied some of them in different contexts), I am not quite sure on how to do the whole procedure ...
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2
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Is it possible to update stripe-width on an existing, and used, ext4 fs?
I have a RAID 5 with 5 3TB drives (8 in few weeks), on a Debian. There is only one ext4 partition on it, using all the space available.
Actually, due to origins of the RAID (4 drives), the ext4 fs ...
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1
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174
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Linux soft RAID6 how to identify last failing drive [duplicate]
I have a RAID6 array that had been neglected, and just had the third drive fail. I want to do a ddrescue of the last drive to fail to try to recover the RAID, however I don't know how to identify ...
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Raid-5 Linux Software array, 3 drives "removed"
I have a raid array with several drives marked as removed. I want to add them back in, but am not sure how to do so.
[root@tera2 ~]# mdadm --detail /dev/md3
/dev/md3:
Version : 1.2
...
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3
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1
answer
79
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One disk of a software RAID10 was repartitioned. What to do?
I have a software array in one machine
root@c ~# mdadm --query --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Mon Mar 17 10:22:38 2014
Raid Level : raid10
Array Size : ...
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