Never assume that just because a server is Ubuntu or RHEL, that its filesystem is ext4 or XFS.

Always verify with `df -hT` or `lsblk -f` before you start tuning mount options or disk quotas. Assumptions are the fastest way to break a perfectly good configuration (speaking from new experience). A two-second check ensures you are working with the right metadata before you begin the initialisation process.

Verification over guesswork, every time.

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