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Cache pool with multiple drives?

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What would be the point of having multiple SSD's in 1 cache pool? How would this work if they are different sizes?

 

I have a cache pool with 2 x SSD's. 1 x TB + 1 x 500 GB. Unraid shows the cache pool size as 1 TB. 

 

Could someone be kind enough to explain what (if any) advantage of such a setup would be? Or point me to documentation which gives information on how multiple drives in 1 cache pool get configured?

 

Thanks.

10 minutes ago, thegrumpyone said:

What would be the point of having multiple SSD's in 1 cache pool?

Redundancy or speed, depending on RAID level configured.

10 minutes ago, thegrumpyone said:

How would this work if they are different sizes?

Poorly.

11 minutes ago, thegrumpyone said:

documentation which gives information on how multiple drives in 1 cache pool get configured?

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

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