November 30, 20232 yr I just installed 2 x 2TB NVMe SSD's for a zfs cache pool. I'm not 100% sure how I want to use it yet. My main problem with Unraid is when copying data from one share to another. The write speeds tank to around 60mb/s which is a pain, even when trying to copy 3-4GB legal-Linux-ISO files. When I download new Linux ISO, I copy the file from my downloads share to my Multimedia share where i store my ISO's. I have a 2 drive + 1 parity array. All my downloads download to Disk 2. My Multimedia share is split across disk 1 and 2. I have the hardlinking option enabled in the settings...so if that that point Unraid is writing new data to disk 2 (high-water filling etc) - a hard link happens rather than a proper data copy and the file transfer is pretty much instant. It's really nice and saves quite a bit of time. I did a test tonight to see whether with a the share set to use cache and then move to the array on schedule, whether it would just do a hardlink and remain on-array rather than copying to the cache first....but alas it did not. It copied the file to the cache. Is there any way to basically say "use the cache if the secondary storage is array, ONLY IF the origin and target disk are different?" Hope that makes sense! Thank you!
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