SSD Cache not formatting

[c41cinema]

Hey all. New to Unraid. Just built a server that is 32TB with a 4TB cache. At least I had hoped. I have a 2TB m.2 and then 2-1TB sata ssd drives for the cache. Whenever I set it up, it always says that there is 1TB of files on it and only 1TB available. I format it, clear the cache, force a move and nothing happens. Any suggestions? I am wanting to use this for video editing, hence the massive cache. Thanks in advance.

[ChatNoir]

Please attach your diagnostics to your next post.

[c41cinema]

2 minutes ago, ChatNoir said:

Please attach your diagnostics to your next post.

Apologies. Here is the diagnostics.

tower-diagnostics-20220306-2345.zip

[JorgeB]

Cache filesystem is corrupt and crashing on mount, if there's nothing important there clear the devices with blkdiscard then re-format the pool.

 

blkdiscard /dev/nvme0n1

and

blkdiscard /dev/sdX

 

[c41cinema]

3 hours ago, JorgeB said:

Cache filesystem is corrupt and crashing on mount, if there's nothing important there clear the devices with blkdiscard then re-format the pool.

 

blkdiscard /dev/nvme0n1

and

blkdiscard /dev/sdX

 

Sorry being a nube here, where do I put this command in? After I click on Cache?

 

[JorgeB]

You need to use the CLI, terminal window or the console.

[JonathanM]

12 hours ago, c41cinema said:

a 4TB cache. At least I had hoped. I have a 2TB m.2 and then 2-1TB sata ssd drives for the cache.

By default Unraid will use RAID1, which if working properly should give you 2TB of usable space. If you want 4TB usable, you need to rebalance to RAID0 after the pool is healthy.

https://carfax.org.uk/btrfs-usage/

[c41cinema]

8 hours ago, JonathanM said:

you need to rebalance to RAID0 after the pool is healthy.

https://carfax.org.uk/btrfs-usage/

Cool I've used raid0 in the past. Where would I go to be able to change that format?

[JonathanM]

11 minutes ago, c41cinema said:

Cool I've used raid0 in the past. Where would I go to be able to change that format?

From the manual linked at the bottom right of the webGUI

https://wiki.unraid.net/Manual/Storage_Management#Change_Pool_RAID_Levels

[c41cinema]

10 hours ago, JorgeB said:

You need to use the CLI, terminal window or the console.

So I used the terminal within unraid. I was able to do blkdiscard /dev/nvme0n1 -f but when I did blkdiscard /dev/sdx it says no such file or directory. So I manually started the array back up and it said I needed to do the format and it said that there was still 1TB of data on it.

 

[JonathanM]

Just now, c41cinema said:

I did blkdiscard /dev/sdx it says no such file or directory.

Which device did you target? The sd(x) designations are subject to change on reboot, so be sure you are specifying the correct letter for the device you want to erase, otherwise you easily could erase a drive you didn't mean to.

[c41cinema]

Just now, JonathanM said:

Which device did you target? The sd(x) designations are subject to change on reboot, so be sure you are specifying the correct letter for the device you want to erase, otherwise you easily could erase a drive you didn't mean to.

Ohhhh I didn't realize that was a variable. Cool appreciate all the help. I'm going to do this with all three and then try to put into RAID O. Hopefully that helps

[c41cinema]

13 minutes ago, JonathanM said:

From the manual linked at the bottom right of the webGUI

https://wiki.unraid.net/Manual/Storage_Management#Change_Pool_RAID_Levels

So I erased all three drives using the Terminal, deleted from the pool, put them back in the pool. It still said that only 1TB was available. I did the Raid0 switch and it says that only 3 TB are free. Here are the diagnostics again. 

tower-diagnostics-20220307-1815.zip

[JonathanM]

Did the rebalance finish that quickly?

[c41cinema]

3 minutes ago, JonathanM said:

Did the rebalance finish that quickly?

I guess so? It says that it is now 4TB.

[JonathanM]

Odd numbers of cache devices don't always report free space correctly. I believe it looks to be correct in the diagnostics, @JorgeB will know for sure.

 

Try copying a couple TB to it and see what the btrfs stats say on the cache page.

[c41cinema]

44 minutes ago, JonathanM said:

Try copying a couple TB to it and see what the btrfs stats say on the cache page.

So I transferred over a terabyte. on the main page it says that 1.06TB is used with 1.94TB free and on the btrs section it says the total is 990 gig. So maybe its being reported wrong?

[JorgeB]

It's normal for the stats not to be correct with that config, raid0 with different size and odd number of devices, you can change to single profile, they will be correct for that.