DayOne Data Centers Ltd. is seeking to double the size of an existing loan to as much as $7 billion, according to people familiar with the matter, in what would be the largest borrowing for the sector by any firm in Asia.

Sumitomo Mitsui Banking Corp. has reached out to Asian banks backing an around $1.5 billion Saudi loan deal to reconfirm their commitments, an unusual step highlighting the risks the conflict in Iran poses for lending in the region.