All Questions
198
questions
1
vote
1
answer
130
views
My Software RAID 5 has 4 3TB HDDs, now two of them have bad sectors. What is a good way to replace them?
I run mdadm on Ubuntu 18.04 to build a RAID 5 array of 4 3TB drives several years ago. The machine was not running for years. Yesterday I powered it on and found two of the disks have a bunch of bad ...
- 73.6k
11
votes
3
answers
16k
views
mdadm RAID Fast Setup with Empty Drives?
I am recreating some RAID5 disks as RAID6 with mdadm. There is no data on the drives that I care about.
Setting up RAID takes a while to setup the shape - I accept that when there there is data that ...
- 141
0
votes
1
answer
513
views
Linux Software Raid Rebuild on machine failure
I have a debian home server that has a 4 disk software RAID 5 array. My OS runs only on a normal nvme SSD. I know thats not secure, but it is a home server, so I didn't really care when I installed it ...
- 1,100
14
votes
7
answers
33k
views
Adding drives to a RAID 10 Array
How would I grow a RAID10 array using mdadm?
Obviously I would need to add 2 drives at a time, or would it have to be 4 drives?
I have a feeling its just a bad idea.
Or would be just wiser to just ...
- 160
0
votes
1
answer
361
views
Will Synology still recognize its drive after it's been assembled via mdadm on another OS?
I have one HDD with a single Basic ext4 volume, and accidentally deleted some of my files on it. I want to try extundelete or ext4magic under Ubuntu, but I'm worried - does mdadm assembly modify the ...
- 71.4k
0
votes
1
answer
244
views
mdadm completely re-syncs the raid5 member but looses every time after reboot
While installing win10 I might have accidentally overwritten on a raid5 member (3 disk setup). So used ubuntu livecd to re-add the disk and re-sync it (took 6 hours). But after I reboot the disk is ...
- 361
36
votes
10
answers
238k
views
How to get an inactive RAID device working again?
After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it.
* Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0.
# mount /...
- 2,984
0
votes
0
answers
142
views
MDADM RAID-1 removes two drives, showing no files on third
For a few weeks ago I noticed one of two drives had been removed from my MDADM RAID-1 array on Ubuntu 20.04. I then bought a third disk (in case something was really wrong). It was also a WD RED 1TB, ...
0
votes
1
answer
223
views
How to reshape a 2-disk RAID1 into a 2-disk RAID5 using mdadm?
According to How to remove a drive from a non-standard 2-drive RAID 5 array?, "with mdadm, a 2 drive RAID 5 is binary identical to a RAID1". If that is so, what's the mdadm command line for ...
- 105
1
vote
3
answers
9k
views
MDADM raid "lost" after reboot
I am kind of scared right now, so I hope you can bring light on my problem!
A few weeks ago, I bought a new 2TB drive and decided to setup a software RAID 5 with MDADM on my HTPC (drive sdb, sdc and ...
- 161
1
vote
1
answer
173
views
How long should RAID 10 syncing stay at 'recovery = 99.9%'?
After replacing a faulty disk in a (CentOS 7) RAID 10, the syncing is at the following stage for quite some time now; it has had this state for more than a day:
md10 : active raid10 sdp1[9] sdo1[8](S)...
- 56.1k
1
vote
1
answer
623
views
Way to monitor progress of RAID10 rebuilding disks, when RAID does not show in /proc/mdstat?
I have an inactive RAID 10, and the output of mdadm --assemble --scan -v |& tail -17 is:
mdadm: /dev/sdn1 is identified as a member of /dev/md/10, slot 5.
mdadm: /dev/sdk1 is identified as a ...
- 1,163
0
votes
0
answers
177
views
Raid array degraded after reboot
I do not know if cross-posting is allowed, but i waited 2 weeks and sadly got now answer or could solve my problem by myself.
In Short: Everytime I have to re-boot our PC the RAID-6 array consisting ...
- 1
3
votes
0
answers
3k
views
Synology DiskStation: How to stop/interrupt a running reshape (RAID5 -> RAID6)
The short of it: I have a running reshape from RAID5 with 5 disks to RAID6 with 6 disks which needs to be stopped, so I can power off the system. I do not care if the reshape needs to start fresh once ...
1
vote
0
answers
231
views
What levels/implementations of RAID, if any, work satisfactorily* with SMR HDDs?
I've heard that SMR drives don't work well with RAID, but that's what I'm stuck with; even a JBOD/linear array would be better than nothing.
*Results in a r/w speed that is greater than or similar to ...
- 135