Changing Cache Disks


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Hi folks!

 

I'm having a "Cache disk is high on usage (71%)".

 

My cache is a pool of two KINGSTON SA400S37 120G and my question is:

 

How is the process of upgrade the cache disks?

 

Questions:

 

  1. Can I remove one of 120G and add a 240G?
  2. Can I remove both at the same time and add a 240G?
  3. What is the best strategy to do so?

 

Thanks in advance!

 

Eduardo

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13 minutes ago, EDalcin said:

Can I remove one of 120G and add a 240G?

You can upgrade one at a time.

 

13 minutes ago, EDalcin said:

Can I remove both at the same time and add a 240G?

No.

 

13 minutes ago, EDalcin said:

What is the best strategy to do so?

 

See here for more info, if you're still on v6.9.x update to v6.10 first since it's broken on that release:

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480419

 

 

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Thanks Jorge. I'm version 6.10.1

 

Thus, based on this:

 

Quote

-You can directly replace/upgrade a single btrfs cache device but the cache needs to be defined as a pool, you can still have a single-device "pool" if the number of defined cache slots >= 2

 

That means I can shut down, take one of the 2 SSDs out of the cache and put a bigger one and turn it back on, and it will rebuild the new one from the remaining old one. Right?

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23 minutes ago, EDalcin said:

Right?

What you describe is not a direct replacement, the part you quoted is for direct replacing a single device, direct replacement always requires the old device connected, though it should still work, but not something I tested much, if you can't have both new and old devices connected I would suggest first removing one device, shutdown and a connect the new device, then add the new device to the pool.

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