November 20, 201114 yr From what I have been reading on the forums, it seems there is confusion as to what unRAID is supposed to do once a cache drive becomes full. My original understanding, prior to getting my own cache drive was that if you write data which exceeds the maximum amount of available space on your cache drive then the data will be written directly to the array; negating the performance benefit you recieve however still allowing the copy/write to take place. At least this seems to be the general misconception amongst many "cache drive related" threads. I now realise, from my own experience and also as per the wiki the following happens: Cache Drive "The final consideration in choosing a cache drive is to think about the amount of data you expect to pass through it. If you write ~10 GBs per day, then any drive 10 GB or larger will do (a 30 GB SSD may be a good fit in this case). If you write 100 GB in one day every few weeks, then you will want a cache drive that is larger than 100 GB. If you attempt a data transfer that is larger than the size of your cache drive, the transfer will fail." What I really want to know is whether the actual/wiki behaviour of the cache drive is what was originally intended or is it likely there will be further development? Such as allowing unRAID to realise the cache drive doesn't have sufficient space available and writes directly to the share, or writes what it can to the cache drive (for the speed benefit) then writes the remaining data directly to the array.
November 20, 201114 yr It will go directly to the array if you set the minimum free space correctly and the file isn't larger than that. If will fail if it is a single file bigger than the cache drive size or you don't set the minimum free space correctly. Peter
February 20, 201214 yr It will go directly to the array if you set the minimum free space correctly and the file isn't larger than that. If will fail if it is a single file bigger than the cache drive size or you don't set the minimum free space correctly. Peter Thank you for the answer. I was going to ask the same question. Thanks.(how can i rep +1 you?)
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