what is the recommended max ext4 partition size for a cyrus mailstore?

["lolcatz21 via Info" <info@xxxxxxxxxxxxxxxxxx>]

I understand fastmail uses 1 or 2 terabyte partitions,  but im curious as to why they chose this number?

fsck check times?

filesystem performance degradation?

inode limitations?

fragmentation?

failure isolation?

Also, is LVM recommended  or frowned upon?

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