April 29, 20224 yr So, long story short... I had a 3 disk BTRFS RAID5 cache pool using disks sitting in a mediasonic probox USB 3.1 enclosure. I added a 4th drive to the probox, and that caused the probox to set new serial numbers for all the disks (kind of a wtf moment). I can still manually mount the btrfs array, but would like to put it back into a cache pool through the GUI. If I set up a "new" cache pool and add the disks back in the same order they were (just using the "new" serial numbers), will unraid just see the btrfs filesystem and import/adopt it? Or is it going to reformat everything and try to create a brand new filesystem?
April 29, 20224 yr Community Expert 3 minutes ago, shredswithpiks said: probox to set new serial numbers Just one of many reasons USB NOT recommended for array or pools
April 29, 20224 yr Author 2 minutes ago, trurl said: Just one of many reasons USB NOT recommended for array or pools Yup, understood. It's not critical data or anything, just a place I've been throwing old disks I've upgraded to larger disks in the main array. Kind of a nice spot for crunching large sets of data I don't need to keep around very long. Really just looking to understand whether cache pools will try to import existing filesystems or if they create new filesystems every time - in case I can save myself a bit of time bouncing data around.
April 29, 20224 yr Community Expert Solution 19 minutes ago, shredswithpiks said: If I set up a "new" cache pool and add the disks back in the same order they were (just using the "new" serial numbers), will unraid just see the btrfs filesystem and import/adopt it? This, you don't even need the same order, just start the array without any pool device assigned so the config is "forgotten", then re-assign the original members only, not the new one, start the array and Unraid will import the existing pool, then add new device.
April 29, 20224 yr Author 12 minutes ago, JorgeB said: This, you don't even need the same order, just start the array without any pool device assigned so the config is "forgotten", then re-assign the original members only, not the new one, start the array and Unraid will import the existing pool, then add new device. Thanks I will give this a shot!
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