August 10, 20223 yr Hi all, I recently wanted to replaced my drives from 2x 2TB HDDs (In Array) and 2x 128GB SSDs (In Pool) to 3x 2TB SSDs (In Array). However, upon reading some other forums, it seems that having SSDs in an array is not supported due to the TRIM function. I have hence created a pool with the 3 disks and used an old SSD as a single drive in the array just so the array can start (maybe this should be fixed in the future to allow the array to start with just pool disks). The issue I am seeing is that the pool is correctly marking the pool as 3TB in size (6TB / 2). I have 110GB used and the free space is being marked as 1.94TB. Where's the other 1 TB? Thanks.
August 10, 20223 yr Community Expert Solution It's a btrfs issue with an odd number of drives in raid1, it still works and free space will get closer to correct as the pool is filled.
August 10, 20223 yr Author I understand, thank you very much. Is there a plan to support SSDs in the Array? Or maybe a way to chose to either have Array Only, Pool Only or Both? Also, is RAID 5 still considered experimental in BTRFS? Thanks.
August 10, 20223 yr Community Expert 13 minutes ago, IcEDFiRE said: Is there a plan to support SSDs in the Array? Yes, but no ETA. 14 minutes ago, IcEDFiRE said: Also, is RAID 5 still considered experimental in BTRFS? Yes, it works mostly fine but there are some known issues, most important ones are fixed for kernel 5.20.
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