Questions tagged [raid1]

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how to identify if raid1 or raid mirror configure on OS disk

we want to verify if raid1 is configured on out linux machine so we found the answer on - https://serverfault.com/questions/110843/how-to-determine-if-a-centos-system-is-raid-1 but from the output - ...
4
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2answers
2k views

Do I need to run 'btrfs balance' occasionally if I have RAID1 btrfs?

I have two devices setup as RAID1 which I assume data (and metadata) will always mirror on both. $ sudo btrfs filesystem show Label: none uuid: eaf30e64-0a90-447f-b53d-1598fe46a8a9 Total ...
0
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1answer
171 views

Q: Setting up RAID1 on CentOS, running into an error

I'm quite new to linux / setting up RAID and was tasked with setting up RAID1 on CentOS system. I've found myself stuck, without much luck from google. I've tried creating the RAID1 device thru the ...
1
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1answer
355 views

Degraded array on software raid

We have a problem with a Degraded array on software raid. After a recent yum update (centOS7 linux 7, 1708) on our linux cluster a message was sent to root indicating that a DegradedArray event had ...
1
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1answer
327 views

RAID1 unmounted during boot as degraded but can be mounted fine manually

I'm running Fedora Server Edition 26 and I have two external USB drives with a partition on each that I have combined in RAID1. My /etc/fstab file has this line for automounting the array: UUID=B0C4-...
2
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1answer
149 views

How does mdadm know where changes occurred?

About 10 days ago, my RAID 1 managed with mdadm had a failure. The array consists of 2 external 2 TB hard drives which are connected via USB and I suspect there was a loose connection which lead to a ...
1
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1answer
229 views

Structure on disk in beginning of RAID 1 (first 128 MiB)

I have a RAID 1 consisting of 2 2 TB disks and noticed that when I compute the cryptographic hash of some range of both disks, unless that range is in the beginning of the disks, I get the same result....
3
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2answers
935 views

LVM metadata missing, trying to recreate raid 1 with LVM

I had a power issue in the house recently, and had issue getting my file server disks to mount. Turns out that one of the devices had renamed itself from sdb to sdd, and all of the LVM metadata is now ...
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0answers
228 views

Grub - are both disks bootable in my server with Debian 7.1 and software Raid1?

I've a problem with one of my two disks of a raid1 software (ovh dedicated server with O.S. Debian 7.1). It will be replaced in a few days. My question is how to check with Grub if both disks are ...
1
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2answers
77 views

Building a network storage server, trade-offs of different RAID configurations?

I want to install a Linux server in my house to be able to share documents and multi-media files between every devices here. The machine I have has 3 HDD slots, I need at least 3.5 TB of storage and ...
2
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2answers
338 views

centos 7 mdadm raid 1 error,

I am trying to get RAID 1 using mdadm. But I got the following error. [root@localhost ahmed]# mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sd[a-b]1 mdadm: /dev/sda1 appears to contain ...
2
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2answers
638 views

btrfs raid1 not using all disks?

I have a Btrfs raid1 with 3 disks on a Ubuntu 16.04. However, it seems only 2 disks are being used instead of all 3. How should I fix this? root@one:~# btrfs fi sh Label: none uuid: 3880b9fa-0824-...
0
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1answer
66 views

How much processing power is enough for mdadm?

I am currently using RAID 1 (4TB X 2)as a motherboard feature with my Linux machine, lately I came across issues of not detecting properly when I moved to Ubuntu 16.04 64bit. So I was thinking if ...
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0answers
551 views

How to mount mdadm RAID1 file system

I've a RAID1 device created with mdadm in liveuUSB mode. When I rebooted I'm front of Grub Rescue interface. So I restarted in liveUSB system and I assembled my RAID1 like : mdadm --assemble /dev/md0 ...
1
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1answer
474 views

LVM RAID1 adding two more disks

We have local server machine in our small company. Its running with Debian 8 on two 120GB SSDs merged in RAID1 with this tutorial. https://blogging.dragon.org.uk/installing-ubuntu-14-04-on-raid-1-and-...
1
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1answer
370 views

CentOS 7 RAID 1 and virtual machines

A CentOS 7 host OS will have three CentOS 7 virtual machines running inside it. Libvirt will be used to set up the virtual machines. Both the host OS and each of the three virtual machines will need ...
0
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1answer
271 views

How to change the ID number of the SCSI bus

I've 2 disk in RAID1 which is broken. I worked several day thinking the RAID is working and I noted not because several files is missing after a reboot. The odder the disk doesn't want to take its ...
1
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2answers
2k views

Write access time slow on RAID1

I'm running MongoDB on my personal computer. I noticed that performance is much slower when the data are on my 2-recent-spinning-hard-drive-software-RAID1 than when they are on an older spinning hard ...
2
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1answer
167 views

ubuntu - raid partition capacity unchanged after RAID1 to RAID5 to RAID6

I had a 2 disk RAID 1 partition. I added a device and converted it to RAID 5: mdadm --add /dev/md3 /dev/sdd2 mdadm --grow /dev/md3 --level=5 --raid-devices=3 Then added another device and converted ...
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0answers
43 views

How to make sure linux machine boots if RAID 1 boot drive fails

I am designing a system that includes a linux (Debian) based control computer. It will be deployed to a remote, inaccessible location. I want to set it up in such a way to maximize the chance that it ...
3
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1answer
2k views

“DegradedArray event”

I have a RAID 1 on my Raspi and got mail I don't understand titled "DegradedArray event on /dev/md0:my-host-name" and "Fail event on /dev/md0:my-host-name". I got 6 messages with the former subject ...
5
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4answers
5k views

Btrfs RAID1: How to replace a disk drive that is physically no more there?

I have a btrfs RAID1 system with the following state: # btrfs filesystem show Label: none uuid: 975bdbb3-9a9c-4a72-ad67-6cda545fda5e Total devices 2 FS bytes used 1.65TiB devid 1 ...
10
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2answers
25k views

Remove drive from soft RAID

I have a dedicated server with 3 SSD drives in RAID 1. Output of cat /proc/mdstat: Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10] md4 : active raid1 sdc4[2]...
0
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1answer
175 views

RAID1 `mdX` looks O.K. on `/proc/mdstat`, but `blkid` and `fdisk -l` of the members report whacky/faulty values

I created a RAID1 with mdadm --create /dev/mdX --level=mirror --raid-devices=2 /dev/sdb /dev/sdc Then watched the first sync on /proc/mdstat. It says [UU]. So far so good. sd[bc] were supposed to ...
2
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1answer
341 views

How to do a bootable full backup of Debian root server to a cloud drive

In the past I was running a server with RAID-1 and experienced the phenomenon that both drives were damaged at the same time (while in holidays). I had a backup of my data partition, but with that of ...
4
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5answers
3k views

What is the difference between btrfs raid1 and btrfs -m dup -d dup on a single device

I've been using btrfs for about two years on multiple devices. I am planning to test some btrfs configurations on a HDD (Single platter) which has non reliable sectors. A dozen of sectors on the HDD ...
3
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0answers
220 views

Don't Spin Up Entire RAID for Read Access

I have a RAID 1 managed by mdadm consisting of a thumb drive and an external HDD. I set a spin-down time for the external HDD. If I access the file system of the RAID to read but not to write (for ...
3
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1answer
7k views

How to mark one of RAID1 disks as a spare? (mdadm)

I have a healthy and working software based RAID1 using 3 HDDs as active on my Debian machine. I want to mark one of the disks as a spare so it ends up being 2 active + 1 spare. Things like: mdadm -...
4
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0answers
590 views

RAID-1 / LVM server won't boot after power outage

Strange issue. After an extended power outage (transformer exploded!) which outlasted the UPS, a server running Slackware 13 crashed. This machine has been quietly serving accounting software and ...
0
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1answer
2k views

mdadm - not enough to start the array

I am trying to recover data from a MyBookLiveDuo 3TB*2 RAID1 setup, which is not responding to http/ssh access. I pulled one drive out of the enclosure and attached it via SATA to a Linux laptop. I ...
1
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1answer
1k views

Convert non-raid disk with data into RAID 1 disk (hardware controller)

I moved away from software RAID due to all the hassle it brings. After OS reinstall, I am left with only one drive. I ordered a hardware RAID controller today, and when the controller arrives, I'd ...
1
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1answer
848 views

extend an LVM mirror with an extra non-mirrored disk

I have an LVM mirror made of 6 disks of 1Tb. I've made a RAID 1 mirror with 3+3 disks. The logical volume and the partition on it have therefore 3Tb of usable space. Running out of disk space, I'm ...
0
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2answers
168 views

HW Raid - Centos 5 - Boot Issues

I am totally lost as to how to fix this or what to do, I am about to just removed the raid all together. (Work stuff though, so Id rather not)\ I have a tower with 4 drives in it. 2 separate raids ...
2
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1answer
2k views

Convert a non-boot single HDD to RAID 1 without deleting it

I bought a second HDD identical size as the one I already have. My goal is to add it to the existing one as a mirror (RAID 1). But I don't have enough space on a system SSD to move data there. So I ...
2
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1answer
317 views

Btrfs adding smaller drive to RAID1

I have a RAID1 btrfs filesystem with 2 2Tb drives, and I had a spare 750 Gb hdd lying around, so I thought I would add it to the RAID so I could use some extra storage. Well, I added it to the volume,...
1
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1answer
283 views

How to configure RAID 1 from Recovery Mode?

I have a server is composed from two HDD 1500 GB SATA (/dev/sda and /dev/sdb), one of this have failed and server is in recovery mode. I want to fix it, first I made a backup of the important ...
0
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1answer
217 views

How to convert SW MD RAID1 arrays to LVM mirrors?

We have SW MD RAID1 on a RHEL5. RAID devices come from multipath currently. # pvs -v --segments Scanning for physical volume names PV VG Fmt Attr PSize ...
2
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0answers
216 views

mdadm - Creating RAID1 on LiveUSB does not persist when re-booting

I have three drives sda, sdb, and sdc: $ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 2.7T 0 disk ├─sda1 8:1 0 1M 0 part ├─sda2 8:2 0 500M 0 part ├─sda3 8:...
2
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1answer
46 views

Using a larger drive in a RAID 1 setup

Is it possible to introduce in a RAID 1 setup a larger drive using its free space for further uses? E.g: What we have: sda - 250 GB HD |-- sda1 - /boot |-- sda2 - / sdb - 500 GB HD |-- sdb1 - /...
14
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3answers
11k views

mdadm: can't remove components in RAID 1

I have my /boot partition in a RAID 1 array using mdadm. This array has degraded a few times in the past, and every time I remove the physical drive, add a new one, bring the array being to normal, ...
1
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1answer
643 views

grub2 lvm2 raid1 /boot

Is it possible to boot from a system where /boot is located within an lvm2 raid1 partition. I've tried a variety of configurations, but I have yet to discover how to do it. I am using two 2TB disks. ...
2
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1answer
1k views

RAID1 that can be enlarged when adding a new disk: convert to lvm --type raid1? [closed]

For the last ten years, I have been making inexpensive servers for small businesses. Each server has two identical drives mirrored with raid1. Later, SATA became available, then eSATA. In the past,...
5
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1answer
17k views

Why does my RAID 1 NAS have to “synchronize”?

I have a new QNAP TS-451 NAS with two new 3TB drives, installed as a RAID 1 pair. As I copy data on to it, it seems to spend the next few hours "synchronizing" the RAID group. (The web console shows a ...
2
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0answers
182 views

BTRFS - Raid incomplete after balancing

I have two 3TB drive that are formated as btrfs and mounted on /media/andy/btrfs as one drive. I run btrfs balance start -dconvert=raid1 -mconvert=raid1 /media/andy/btrfs/ which takes forever. It ...
2
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0answers
394 views

Degraded RAID1 array boots with one drive, not with the other

UPDATE It seems initramfs fails to properly mount the array. If I stop and reassemble them, they works: mdadm --stop /dev/md124 mdadm --assemble --run /dev/md124 /dev/sda6 Maybe initrd tries to run ...
1
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1answer
939 views

Can't boot from RAID array - arrays not assembled at boot

On my lubuntu 13.10, I created a degraded RAID array, copied all the contents of the "main" disk and tried to boot from the array. I mostly followed these instructions. At boot the system does not ...
1
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1answer
4k views

“Spare” disk in a 2-disk mdadm RAID1 array?

I recently had a RAID1 volume fail. It had three primary partitions in it, all participating in separate, but similarly configured VGs. This configuration comes from the fact that the machine is ...
4
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1answer
5k views

How to install Debian Jessie properly onto multiple devices with BTRFS in mode RAID 1?

As a short introduction I'm going to tell you, what kind of setup I have and what I want to achieve. After that I try to explain my problem. Since this is my first question on U&L I have to ...
1
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1answer
214 views

Clone installed system by using the hardware RAID 0+1 synchronization

Alright, following setup: 2 identical machines (DELL Power Edge T320) with a hardware raid. one machine is running for a while now, one machine hasn't even been set up at all The running machine has ...
0
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1answer
161 views

RAID Level 5 versus Level 1

Is it slower to write one block in RAID Level 5 with 5 disks than RAID 1 with two disks (mirroring only)? I think No since with Level 5 you are writing the data and the parity (two writes). With Level ...