An administrator notices that a recently mounted ext4 filesystem is not correctly recording the access times of files when they are read. The administrator suspects that a mount option may be causing this behavior. Which of the following mount options did the administrator most likely use when mounting the filesystem?
dirsync
relatime
sync
noatime
The correct answer is 'noatime'. This mount option disables the updating of access times on files when they are read, which can improve performance, especially on frequently accessed filesystems. The 'relatime' option updates access times only if the previous access time was earlier than the current modify or change time. 'sync' and 'dirsync' are not directly related to file access time updates; 'sync' makes all writes synchronous, and 'dirsync' ensures directory changes are written synchronously, but neither disables the update of access times.
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