August 28, 201510 yr Want to check on this before I begin rearranging my drives and crack open my computers.... Am I able to add a second cache drive to my system, and maintain the existing cache drive? I have VM's and such on it, and don't want to lose them. My interpretation of how multiple cache drives work, is that there is some form of redundancy, along side a capacity increase with dual cache drives. Please correct me if I am wrong here! I have one 240 gig SSD, looking to add an identical second. I also have a "scrap" 250GB HDD, is it worth adding that guy too?
August 30, 201510 yr Community Expert Back up your cache just in case. You must stop the array and decrease the number of available array slots before you can increase the number of available cache slots. Turn on the help in the webGUI. Search the wiki for cache pool. Also see search tips in my sig. btrfs disk usage calculator
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