> I've been trying to figure out how to determine the free space of a real
> time volume. It seems xfs_db might hold the key but no luck so far...
> Simply running df -h tells me the free space of the meta-data drive only
> which basically doesn't change even after Terabyte data collections.
> I created the filesystem like this:
> mkfs.xfs -r rtdev=/dev/md0 /dev/sda
> How would I tell how much space is left on /dev/md0?
The XFS_IOC_FSCOUNTS ioctl exposes this information, and you can use the
xfs_quota "free" command to see it (even if you're not using quotas). The
df command has no knowledge of the realtime subvolume.