November 4, 20178 yr Community Expert I have a disk that is formatted as btrfs. I used to use it as a cache drive, but may want to re-use it for something else. Two questions: 1) I tried to mount it as a regular disk outside the array. Somehow, this does not work. Assume this may be because I cannot mount btrfs disks? If so, what to do? Can I format it? Or other work-around? 2) My new cache disk is formatted as XFS. Can I have my "old" cache disk (formatted as btrfs) as second cache disk? I don't want to merge it with the first, but can I run both separately as two disks?
November 4, 20178 yr Community Expert 3 minutes ago, steve1977 said: 1) I tried to mount it as a regular disk outside the array. Somehow, this does not work. Assume this may be because I cannot mount btrfs disks? If so, what to do? Can I format it? Or other work-around? If it was from a single disk cache it should mount with the unassigned devices plugin. 4 minutes ago, steve1977 said: 2) My new cache disk is formatted as XFS. Can I have my "old" cache disk (formatted as btrfs) as second cache disk? I don't want to merge it with the first, but can I run both separately as two disks? No, cache pool requires all btrfs devices.
November 4, 20178 yr Author Community Expert Thanks. My "old" brtfs disk was part of a cache pool. Assume that's the reason why I now cannot mount it. How an I format it? Turn it into a NTFS or XFS disk and just run it as mounted disk outside array possible?
November 4, 20178 yr Community Expert Yes, you can't mount a disk that was part of a pool, well it usually can be mounted manually.You can use the UD plugin to reformat with the same or a different filesystem.
November 4, 20178 yr Author Community Expert Thanks, this is helpful. One related question about the cache pool: Assuming I reformat both disks as brfs, what are the use cases for using two cache disks? I don't think I can mirror them as they are different sizes. I don't really want to "pool" them as I don't want files across the two and keep the disks independent (allowing me to remove one of them at any time). Does my restrictions leave me with any use case for 2 cache disks?
November 4, 20178 yr Community Expert 3 minutes ago, steve1977 said: Does my restrictions leave me with any use case for 2 cache disks? No, it will always create a pool, though you can choose from different profiles, raid1, raid0, single, ,etc, there's no way to keep them independent.
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