[SOLVED] Synchronized pool devices

valasg · May 1, 2021

Hi,

I used to consume a pool of 2 SDD to run/backup my docker apps and VMs. I finally decided to split the pool so that I get 2 pools with one SDD each, to run separately docker and VMs (no more backup of course). However, once created, they look synchronized. I mean when I change the content of one (/mnt/cache_docker), for instance creating/removing a share or downloading a file, the exact same action happens on the other one (/mnt/cache_vm). Is there a way to break this link ?

Many thanks,

itimpi · May 1, 2021

It might be necessary to give more detail on the steps you took to break them into 2 pools. Sounds as if they may still be running as a single pool?

attaching your system’s diagnostics zip filen(obtained via Tools > Diagnostics) attached to your next post may allow for more informed feedback.

valasg · May 1, 2021

Thanks for your quick reply.
"Sounds as if they may still be running as a single pool" -> absolutely !
I am attaching the diagnostics.

Best regards,

horus-diagnostics-20210501-1907.zip

ChatNoir · May 1, 2021

Please also

1 hour ago, itimpi said:

give more detail on the steps you took to break them into 2 pools

valasg · May 1, 2021

So, I

- stopped the array

- disabled docker and vms (via settings menus)

- went to my unique pool and set the second slot to "no device"

- set Slots to 1 instead of 2

- clicked on "ADD POOL", set cache_vm as the name, and 1 as the slots

- selected the remaining SDD (the one removed earlier) instead of "no device" in the second pool combo

- restarted the pool

- changed in shares the "select cache pool" value by pointing the docker related shares to the cache_docker, and the vm ones to cache_vm

many operations, maybe in the wrong order ?

Vr2Io · May 1, 2021

Check does both with same UUID

At command prompt type blkid ?

valasg · May 1, 2021

Indeed they look to have the same UUID : 8d14eb99-e521-4c8b-9e04-7a448ccd6f30

What's the way to change this please ?

root@HORUS:~# blkid
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/sda1: LABEL_FATBOOT="UNRAID" LABEL="UNRAID" UUID="2732-64F5" BLOCK_SIZE="512" TYPE="vfat"
/dev/nvme1n1p1: UUID="8d14eb99-e521-4c8b-9e04-7a448ccd6f30" UUID_SUB="f0ef586f-bf35-4655-aeaa-5f6ac9208262" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/nvme0n1p1: UUID="8d14eb99-e521-4c8b-9e04-7a448ccd6f30" UUID_SUB="45556f71-e386-417a-bc2b-09439fda7c0e" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/sde1: UUID="92b8f2be-7eac-49e6-bac5-48f9da265c07" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="ec60a12d-4cc8-4146-b863-edf1755c1b59"
/dev/sdc1: UUID="29d7fb75-7e4c-4a0d-99b7-82b1a6c12d9a" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="48c31838-659b-4f63-b868-b013ca28663e"
/dev/sdd1: UUID="1c3c2a87-61c6-4609-a974-82e4cfed151a" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="fbd77100-0ab9-4154-a780-70974f0ade93"
/dev/sdb1: UUID="a753234c-6126-45e2-8a06-48acb30a6487" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="a6f418bb-c19e-4216-881e-a6b6bb094e1e"
/dev/md1: UUID="29d7fb75-7e4c-4a0d-99b7-82b1a6c12d9a" BLOCK_SIZE="512" TYPE="xfs"
/dev/md2: UUID="1c3c2a87-61c6-4609-a974-82e4cfed151a" BLOCK_SIZE="512" TYPE="xfs"
/dev/md3: UUID="92b8f2be-7eac-49e6-bac5-48f9da265c07" BLOCK_SIZE="512" TYPE="xfs"
/dev/loop2: UUID="ae7bf697-26fe-4346-b42f-23027d10b0a5" UUID_SUB="5a792d8f-358b-440b-b30a-d1fbb89c4e17" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/loop3: UUID="f17a1a2b-7ac8-4080-95d2-7200eea5d82d" UUID_SUB="87f2d071-fdc3-42f0-a06d-a8c1e04cf6a9" BLOCK_SIZE="4096" TYPE="btrfs"

Vr2Io · May 1, 2021

Both problem disk are NVMe ?

Suppose change UUID would solve the problem, pls have backup, then change either one device UUID

btrfstune -u /dev/nvme0n1p1 or 1n1p1

then reboot

Yes should delete the partition when disk release from pool, clear before use.

Edited May 1, 2021 by Vr2Io

valasg · May 1, 2021

Yes both are NVMe

I've removed nvme0n1p1 from any pool so that it is in the "Unassigned Devices" now, and the "MOUNT" button is available

however btrfstune -u /dev/nvme0n1p1

produces ERROR: /dev/nvme0n1p1 is mounted

Vr2Io · May 1, 2021

Pls stop array and confirm disk at UD also umount. ( UD button show mount means its not mount )

Edited May 1, 2021 by Vr2Io

valasg · May 1, 2021

Stopping the array allowed me to run the command successfully, but after reboot a new id was assigned to both nvme !

root@HORUS:~# blkid
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/sda1: LABEL_FATBOOT="UNRAID" LABEL="UNRAID" UUID="2732-64F5" BLOCK_SIZE="512" TYPE="vfat"
/dev/nvme1n1p1: UUID="cf2aac75-db53-47b1-931a-ae65b2eff77b" UUID_SUB="f0ef586f-bf35-4655-aeaa-5f6ac9208262" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/nvme0n1p1: UUID="cf2aac75-db53-47b1-931a-ae65b2eff77b" UUID_SUB="45556f71-e386-417a-bc2b-09439fda7c0e" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/sdb1: UUID="a753234c-6126-45e2-8a06-48acb30a6487" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="a6f418bb-c19e-4216-881e-a6b6bb094e1e"
/dev/sdc1: UUID="29d7fb75-7e4c-4a0d-99b7-82b1a6c12d9a" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="48c31838-659b-4f63-b868-b013ca28663e"
/dev/sdd1: UUID="1c3c2a87-61c6-4609-a974-82e4cfed151a" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="fbd77100-0ab9-4154-a780-70974f0ade93"
/dev/sde1: UUID="92b8f2be-7eac-49e6-bac5-48f9da265c07" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="ec60a12d-4cc8-4146-b863-edf1755c1b59"
/dev/md1: UUID="29d7fb75-7e4c-4a0d-99b7-82b1a6c12d9a" BLOCK_SIZE="512" TYPE="xfs"
/dev/md2: UUID="1c3c2a87-61c6-4609-a974-82e4cfed151a" BLOCK_SIZE="512" TYPE="xfs"
/dev/md3: UUID="92b8f2be-7eac-49e6-bac5-48f9da265c07" BLOCK_SIZE="512" TYPE="xfs"
/dev/loop2: UUID="ae7bf697-26fe-4346-b42f-23027d10b0a5" UUID_SUB="5a792d8f-358b-440b-b30a-d1fbb89c4e17" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/loop3: UUID="f17a1a2b-7ac8-4080-95d2-7200eea5d82d" UUID_SUB="87f2d071-fdc3-42f0-a06d-a8c1e04cf6a9" BLOCK_SIZE="4096" TYPE="btrfs"

Vr2Io · May 1, 2021

Sound like you should run some command to make a RAID 1 pool to be a single disk pool, but I am not family in that.

I usually delete RAID pool's partition in UD and create again if disk have rearrange.

valasg · May 2, 2021

Rerunning the change UUID steps, both disks were changed simulteneously, they look intricated !

root@HORUS:~# btrfstune -u /dev/nvme0n1p1
WARNING: it's recommended to run 'btrfs check --readonly' before this operation.
        The whole operation must finish before the filesystem can be mounted again.
        If cancelled or interrupted, run 'btrfstune -u' to restart.
We are going to change UUID, are your sure? [y/N]: y
Current fsid: cf2aac75-db53-47b1-931a-ae65b2eff77b
New fsid: b62f4e84-a8d6-449d-8bc4-c77f1e9c2c6b
Set superblock flag CHANGING_FSID
Change fsid in extents
Change fsid on devices
Clear superblock flag CHANGING_FSID
Fsid change finished
root@HORUS:~# blkid
/dev/loop0: TYPE="squashfs"
/dev/loop1: TYPE="squashfs"
/dev/sda1: LABEL_FATBOOT="UNRAID" LABEL="UNRAID" UUID="2732-64F5" BLOCK_SIZE="512" TYPE="vfat"
/dev/nvme1n1p1: UUID="b62f4e84-a8d6-449d-8bc4-c77f1e9c2c6b" UUID_SUB="f0ef586f-bf35-4655-aeaa-5f6ac9208262" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/nvme0n1p1: UUID="b62f4e84-a8d6-449d-8bc4-c77f1e9c2c6b" UUID_SUB="45556f71-e386-417a-bc2b-09439fda7c0e" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/sdb1: UUID="a753234c-6126-45e2-8a06-48acb30a6487" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="a6f418bb-c19e-4216-881e-a6b6bb094e1e"
/dev/sdc1: UUID="29d7fb75-7e4c-4a0d-99b7-82b1a6c12d9a" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="48c31838-659b-4f63-b868-b013ca28663e"
/dev/sdd1: UUID="1c3c2a87-61c6-4609-a974-82e4cfed151a" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="fbd77100-0ab9-4154-a780-70974f0ade93"
/dev/sde1: UUID="92b8f2be-7eac-49e6-bac5-48f9da265c07" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="ec60a12d-4cc8-4146-b863-edf1755c1b59"

I am quite lost actually

Quote

I usually delete RAID pool's partition in UD and create again if disk have rearrange.

I don't see any particular command/button in the interface

valasg · May 2, 2021

And coudn't be something to be tuned at BIOS level ?

JorgeB · May 2, 2021

You can't change the UUID because both devices are still part of the same pool, do this:

Stop the array, if Docker/VM services are using the cache pool disable them, unassign all pool devices (from both pools), start array to make Unraid "forget" current pool config, stop array, reassign both devices to the same pool (there can't be an "All existing data on this device will be OVERWRITTEN when array is Started" warning for any pool device), start array, pool should mount normally and you can start docker/VM services if stopped before, now see here to remove one of the devices from the pool, when it's done you can re-add it to a different pool (it will need to be formatted).

valasg · May 2, 2021

I've performed the 1st part untill the removal procedure

But then , I can do

1- stop the array

2- unassign pool disk to remove

but not

3- start the array

as the START buttong is greyed, and a "Missing Cache disk" warning is displayed

(pics attached)

thanks !

JorgeB · May 2, 2021

10 minutes ago, valasg said:

as the START buttong is greyed, and a "Missing Cache disk" warning is displayed

image.png.0fe90a3bfde355b279c9b6f0df6a949b.png

valasg · May 2, 2021

My bad ...

Everything works fine now, thank you all for your help !

[SOLVED] Synchronized pool devices

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