On 13/05/18 01:07, Henri Derksen wrote:
> hello mark,
>
> ml> on linux, one can disable what is known as "atime", one of the three
> ml> time stamps, which will save a lot of write cycles...
>
> can you tell me wich three time stamps there are?,
> and how I can switch of that "atime" one in Raspbian Linux?
> thanks.
>
mtime atime and IIRC ctime

https://www.unixtutorial.org/2008/04/atime-ctime-mtime-in-unix-filesystems/

last modfied, last accessed and when created.


You specify whether atime is to be used in  a mount option, generally
specified in /etc/fstab

i.e.

UUID=2be84ecd-556e-488c-a832-67c49114a06c /               ext4
discard,noatime,errors=remount-ro 0       1

This is a standard mount configuration for a solid state disk linux root
partion - noatime says don't update access time on files read and
discard tells mount/the kernel to issue TRIM commands which help do wear
levelling on SSDS.

I am not sure that the latter argumemnt applies to standard flash memory
chips.


> Henri.
>


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