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Cache pool smaller than drive capacity

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I have a pair of 800GB SSD drives installed for my cache, the system is reading the pool size as 650GB, and the used/free capacity only adds up to 500GB, how do I get Unraid to use the full 800GB?

cache.png

Solved by JorgeB

  • Community Expert

Convert the pool to single profile, of course there won't be any redundancy. 

4 hours ago, JorgeB said:

Convert the pool to single profile, of course there won't be any redundancy. 

 

16 hours ago, worldspawn said:

how do I get Unraid to use the full 800GB?

Shouldn't RAID1 give 800GB? I suspect there are multiple BTRFS profiles causing issues, but without diagnostics, who knows.

  • Community Expert
15 minutes ago, JonathanM said:

Shouldn't RAID1 give 800GB?

It should, don't know how but I saw that as different capacity devices before, please post the diagnostics.

  • Community Expert

Possibly one of the devices is not fully portioned, but there's so much log spam about this disk that is difficult to look at anything else:

Jan  3 12:06:43 Broomhilde  emhttpd: ST18000NM000J_ZR5AG18T (sdd) 512 35156656128

 

Check/replace cables, reboot and post new diags after array start.

 

  • Author

That's because that drive is mid-clear, it's 18TB, so it takes over a day.

 

The Cache drives are sdb and sdc, sdd is not involved.

Edited by worldspawn

  • Community Expert
23 minutes ago, worldspawn said:

That's because that drive is mid-clear

That's not the problem, the problem are the constant ATA errors spamming the log.

 

23 minutes ago, worldspawn said:

The Cache drives are sdb and sdc, sdd is not involved.

I know, but the constant log spam makes it very difficult to see anything else.

  • Community Expert
  • Solution

Type

btrfs fi resize 1:max /mnt/cache

Then reboot and post new diags after array start.

  • Community Expert
6 hours ago, worldspawn said:

Size updated as soon as the command was run

Great, it should, but sometimes it takes a few seconds or more. 

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