All Questions
Tagged with mdadm software-raid
105
questions
3
votes
4
answers
10k
views
MDADM reshape really slow
To sum up : My raid reshape with mdadm is really slow.
The complete story : 3 days ago I realized that one of my disks from a raid 5 array was faulty. I removed it and replaced it with a brand new ...
- 335
2
votes
2
answers
20k
views
How do I tell mdadm to start using a missing disk in my RAID5 array again?
I have a 3-disk RAID array running in my Ubuntu server. This has been running flawlessly for over a year but I was recently forced to strip, move and rebuild the machine.
When I had it all back ...
- 21
0
votes
1
answer
388
views
Long-term local offline RAID storage of never-changing data
I have about 20TB of data that will remain unchanged (forever) and I am planning to make offline copies with a little redundancy.
I already have a lot of 2TB drives that I plan on using and I am ...
- 677
0
votes
0
answers
257
views
mdadm.conf: mdadm -E --scan *vs* mdadm -D --scan, which is correct to use?
I have two questions:
It's not clear which flag to use when generating mdadm.conf.
I've seen people and documentation use
mdadm -E --scan
I've also seen mdadm -D --scan.
Which is correct to use?
...
- 2,297
2
votes
1
answer
943
views
mdadm re-added a removed disk to my RAID1 and skipped re-sycning it, what went wrong?
I ran into what is a true mystery to me today, and would love if someone could give me an idea of how what happened is even possible.
We had physically removed a disk from our software RAID1 (Ubuntu ...
- 1
4
votes
1
answer
758
views
Raid Spare Spin Down
I have a software RAID 5 array (mdadm under Debian Linux) that has been up for the better part of a decade and has seen it's fair share of drive failures. I've always been leery about setting up a "...
- 136
0
votes
1
answer
274
views
Would it be advisable to have 2 raid-1 (mirror) using just 2 physical drives compared to just 1 raid-1 on 2 physical drives?
I'm using 2-bay drive Synology (implies I'm using linux mdadm software based RAID system).
The motivation for doing so is to lessen the time rebuild RAID-1 array after it goes degraded. I currently ...
- 65.3k
0
votes
1
answer
841
views
Can a mdadm software RAID 1 drive be accessed independent of the other drive in the array?
I'm doing research for a project I'm starting, so I cannot provide configuration here. Say I have a software RAID 1 array configured between two drives with mdadm.
If I write data to the array and ...
CommunityBot
- 1
0
votes
1
answer
46
views
I added 5 drives to mdadm raid array, then I noticed 3 had partitions on them already. What is going to happen?
I have a 15 drive raid6 array using MDADM on ubuntu linux 18.04.2 server. I installed 5 more drives and added them to the raid array, and it started reshaping. However, after that I noticed that three ...
- 71.4k
2
votes
2
answers
2k
views
raid 1 badly detected as raid 0 when one drive is missing
I'm learning raids, so maybe this is some basic question, but it's not covered anywhere...
When I create raid 1, update /etc/mdadm/mdadm.conf as[1], run update-initramfs -u, I can reboot and mount it....
- 1
1
vote
1
answer
747
views
btrfs ontop of mdadm raid - calculating stripes for corrupt sectors for use with raid6check
I've got a setup with btrfs running on top of mdadm raid6 as btrfs's RAID5/6 code isn't stable yet. I figured this way I'd get the benefits of snapshotting and checksumming with a few extra hoops to ...
- 41
5
votes
2
answers
11k
views
Convert RAID 1 to RAID 10 in mdadm
In my current Ubuntu server, I have 2x 2TB Western Digital RED hard drives in a RAID 1, using mdadm. I would like to add 2 more 2TB RED drives, and convert it to a RAID 10. I realize I would have to ...
- 24.4k
1
vote
1
answer
613
views
File system corrupt after re-adding software RAID 1 member after test. Why?
A colleague and me set up a software RAID 1 with mdadm consisting of two physical disks, with two partitions on the virtual device. The set up went fine, and booting directly from one of the RAID ...
CommunityBot
- 1
1
vote
1
answer
2k
views
Software RAID Nonfunctional after power outage
My server lost power yesterday. It automatically booted up when power came back, but my RAID is now nonfunctional.
The RAID array is a software RAID6 built with mdadm. Originally, the array used 8 ...
- 31
5
votes
0
answers
2k
views
mdadm RAID monitoring no DegradedArray email
So, I have a couple of MDADM RAID arrays and I want to set up monitoring with email notifications for drive failures through sSMTP but I can't seem to get it working.
The system in question is a ...
- 421