DZMM cache pool configuration change

[DZMM]

Help please.  I have a single profile cache 'pool' I'm trying to convert to RAID0.  I've tried:

 

btrfs balance start --dconvert=raid0 -mconvert=raid1 /mnt/disks/ud_pool

 

and

 

btrfs balance start --dconvert=raid1 -mconvert=raid1 /mnt/disks/ud_pool

 

neither worked.  What should I be using?  Thanks

 

root@Highlander:~# btrfs fi df /mnt/disks/ud_pool
Data, single: total=176.01GiB, used=72.13GiB
System, DUP: total=8.00MiB, used=48.00KiB
Metadata, DUP: total=3.00GiB, used=450.98MiB
GlobalReserve, single: total=240.84MiB, used=0.00B

 

[JorgeB]

1 hour ago, DZMM said:

btrfs balance start --dconvert=raid0 -mconvert=raid1 /mnt/disks/ud_pool

There's one too many - before dconvert, it should be -dconvert

[DZMM]

thanks - so it's

 

btrfs balance start -dconvert=raid0 -mconvert=raid1 /mnt/disks/ud_pool

 

not

 

btrfs balance start -dconvert=raid1 -mconvert=raid1 /mnt/disks/ud_pool

 

to go from single profile to RAID0?

[trurl]

Why did you post this in Unassigned Devices plugin support thread? I have split it into its own topic in General Support.

[JorgeB]

Yes, the first one

[JorgeB]

BTW, the most used pool configurations are listed here:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421

[DZMM]

7 hours ago, trurl said:

Why did you post this in Unassigned Devices plugin support thread? I have split it into its own topic in General Support.

Because I created my second cache pool using Unassigned Devices

 

 

[DZMM]

49 minutes ago, johnnie.black said:

Yes, the first one

Thanks

5 minutes ago, johnnie.black said:

BTW, the most used pool configurations are listed here:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480421

Thanks - that's where I got the commands from, but I wasn't sure if the command was still correct if converting from single pool

[JorgeB]

Just now, DZMM said:

but I wasn't sure if the command was still correct if converting from single pool

Commands are always the same, it only matters what you're converting to.

[DZMM]

Thanks.  One last question please.  It seems implicit in the description that the command can be run on a live pool - do I need to take any precautions before I start?

[JorgeB]

7 minutes ago, DZMM said:

It seems implicit in the description that the command can be run on a live pool - do I need to take any precautions before I start?

It can only be run on a live pool, and it's very low risk, but it can go wrong, especially if there are pre-existing issues with the pool, so if possible it's always a good idea to backup any important data before beginning.

[DZMM]

Thanks - doing now

 

Edit: Worked fine - took around 15 mins on a 250GB pool

root@Highlander:~# btrfs balance start -dconvert=raid0 -mconvert=raid1 /mnt/disks/ud_pool
Done, had to relocate 177 out of 177 chunks

 

Edited September 18, 2018 by DZMM