lumyhm

I have been observing a similar increase in reserved size going from Unraid 6 to 7. A 28 TB drive would reserve around 500 GB now, when it would only reserve 195 GB before. By comparing the xfs_info output between a drive formatted in Unraid 6 (can't recall the exact version number, but it was one of the later ones close to 7.0 RC release date), I found that all my drives were already formatted using crc=1 and reflink=1, so this was not the cause of the increase in reserved space. However I noticed that Unraid 7 will set rmapbt=1 and nrext64=1, whereas in Unraid 6 these were both 0. I manually reformatted a drive using mkfs.xfs -m crc=1,finobt=1,rmapbt=0 -i nrext64=0 -f /dev/mdXp1 in Maintenance Mode and was able to get the reserved space down to 195 GB again.