[CentOS] Any downside to mount -o noatime?

Fri Feb 11 06:26:11 UTC 2022
Jon LaBadie <jcu at labadie.us>

On Thu, Feb 10, 2022 at 09:49:14PM -0800, Kenneth Porter wrote:
>--On Thursday, February 10, 2022 11:08 PM -0500 Jon LaBadie
><jcu at labadie.us> wrote:
>> Are you reading that as "atime gets updated every 24 hrs"?  If so you
>> are missing "if needed".  I.e. if the file's data blocks have been read.
>> Checking time-stamps and sizes are not operations that cause atime
>> updates.  Those are inode operations, not data reads.
>That I got. I was concerned with the case where rsync does a checksum to
>verify that the file's contents didn't change without changing the
Which you indicated are "less frequent" for full backups.
How often are full backups done?

And no, it would not be a write for each file.  It would
be an update to the in memory version of the inode.  At
some point it will be written back to "disk".  But only
as a block of many inodes for many files.  Some of those
files may not even have had any timestamp changes.  Others
might require that the block of inodes be written because
there was an mtime, ctime, size, permission change in any
one of the inodes in the block.  But it would be one write
for all the inodes in that block.

Jon H. LaBadie                  jcu at labadie.us