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1 hour ago, Perforator said:

1) how do you replace parity disk

2) how do you replace data disk

3) how do you shrink your array

The answers to all those questions and many more can be found in the documentation https://wiki.unraid.net/Official_Documentation


  1. https://wiki.unraid.net/UnRAID_6/Storage_Management#Upgrading_parity_disk.28s.29
  2. https://wiki.unraid.net/UnRAID_6/Storage_Management#Replacing_disks
  3. https://wiki.unraid.net/UnRAID_6/Storage_Management#Removing_data_disk.28s.29
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contact the drive manufacturer or ignore the warning from FCP

You can but should use regular dd instead, also make sure you don't try to mount the pool with duplicate devices attached.   Edit to add: You'll need to do a new config or make Unraid forget

We can, adding that any sort of overclocking for a server is a bad idea, though Intel systems are mostly stable with RAM using XMP profiles, Ryzen based servers on the other hand appear to be prone to

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  • 1 month later...
On 3/8/2017 at 11:13 AM, JorgeB said:



Create a temporary mount point, e.g.:

mkdir /x

Now attempt to mount the filesystem read-only:

mount -o usebackuproot,ro /dev/sdX1 /x

For a single device: replace X with actual device, don't forget the 1 in the end, e.g., /dev/sdf1

For a pool: replace X with any of the devices from the pool to mount the whole pool (as long as there are no devices missing), don't forget the 1 in the end, e.g., /dev/sdf1, if the normal read only recovery mount doesn't work, e.g., because there's a damaged or missing device you should use instead:


i'm attempting to recover the cache data, ahead of reformatting

i believe i was able to create the directory "x"

however, i was unable to mount 

i entered


mount -o usebackuproot,ro /dev/nvmeOn1 /x


but got "does not exist"

i've attached screen shot, and was assuming for nvme, that was correct



>>>See Below, from Terminal<<<

Linux 4.19.107-Unraid.
Last login: Sun Oct 18 10:03:30 -0500 2020 on /dev/tty1.
root@Titan:~# mkdir /x
mkdir: cannot create directory ‘/x’: File exists
root@Titan:~# mount -o usebackuproot,ro /dev/nvmeOn1 /x
mount: /x: special device /dev/nvmeOn1 does not exist.






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7 hours ago, strykn said:

i entered


mount -o usebackuproot,ro /dev/nvmeOn1 /x

You haven't specified the partition number, that is why the instructions say

On 3/8/2017 at 12:13 PM, JorgeB said:

don't forget the 1 in the end




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  • 4 months later...
On 2/4/2020 at 5:57 AM, JorgeB said:

What can I do to keep my Ryzen based server from crashing/locking up with Unraid?



Ryzen on Linux can lock up due to issues with c-states, and while this should mostly affect 1st gen Ryzen there are reports that 2nd and even 3rd gen can be affected in some cases, make sure bios is up to date, then look for "Power Supply Idle Control" (or similar) and set it to "typical current idle" (or similar).


More info here:



Also many of those servers seem to be running overclocked RAM, this is known to cause stability issues and even data corruption on some Ryzen/Threadripper systems, even if no errors are detected during memtest, server and overclock don't go well together, respect max RAM speed according to config and CPU listed on the tables below.


Note: Ryzen based APUs don't follow the same generation convention compared to regular desktop CPUs and are generally one generation behind, so for example Ryzen 3200G is a 2nd Gen CPU:





1st gen Ryzen:



2nd gen Ryzen:



3rd gen (3xxx) and Zen3 (5xxx) Ryzen :



Threadripper 1st Gen:



Threadripper 2nd Gen:



Threadripper 3rd Gen:




I have changed to DD4-3200

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