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Move SATA Cache drive to new NVMe Cache drive, then "RAID 1"


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Hey dear Community, I hope this is in the right Section

 

I've build an unraid server with 2x 1TB HDDs as Parity and 1x 500GB SATA SSD as Cache

 

Now i have a 500GB NVMe installed and wanted to replace the 500GB SATA SSD as Cache, I had them added as Pool because of RAID 1, but the "older" SATA SSD is the primary cache, so the NVMe is the "RAID 1" mirrored Drive.

 

I want to make the NVMe the primary Cache, so the SATA SSD will be the "backed up" Drive if the NVMe fails, but how exactly do I make it happen?

 

After some research I didn't found something that matches my Topic, so I had to ask it here now.

 

I'm sorry if it exists an Topic as similar as mine, but I hadn't found anything.

 

Thanks for now :) 

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7 minutes ago, zBLacKy said:

Now i have a 500GB NVMe installed and wanted to replace the 500GB SATA SSD as Cache, I had them added as Pool because of RAID 1, but the "older" SATA SSD is the primary cache, so the NVMe is the "RAID 1" mirrored Drive.

I assume you are using btrfs, you cannot prioritize one of the devices over the other, any writes will be limited by the slowest device, reads will alternate from one or the other based on the PID.

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3 minutes ago, JorgeB said:

I assume you are using btrfs, you cannot prioritize one of the devices over the other, any writes will be limited by the slowest device, reads will alternate from one or the other based on the PID.

So it doesn't matter which one is prioritized, because the SATA is limiting anyway? 

 

Thanks for your fast response :) 

 

Edit: Yes, I'm using btrfs on the cache.

Edited by zBLacKy
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