Hello, Ted, Thanks indeed for the help, really appreciated! BTW, is it proper to fallocate whole disk space to exhaust disk? I see even fallocate full disk size, seems file size equal to avail size still can be allocated. i.e. When /tmp availability space is 26G, but fallocate requests 32G (total disk space), we see it finally allocated a 26G file, but exit code is 1. Is it legal usage or will it trigger some unknown issue? I'm a newbie on fallocate:) Best regards, Jianyue Wu