On 2019-10-27, Javier  wrote:
> Areligious Republican  wrote:
>> I read somewhere (forgotten where) yesterday that the SD card in a
>> RPi malfunctions because log files (which nobody reads anyway)
>> wear out the write count on the card and so one has to keep
>> a stock of SD cards to hands with the OS already on.
>
> Years ago they used to advocate to disable logging entirely for SSDs
> to prolong SSD life.
>
>     systemctl stop systemd-journald.service
>     systemctl mask systemd-journald.service
>
> SSDs have gotten better and probably this is not necessary anymore.
>
> Other tweaks are mounting / with the noatime option (default in Raspbian)
> and using tmpfs as much as you can.
>
> Raspbian default of /tmp not being in tmpfs is not good for wear&tear.
> Putting this in /etc/fstab should correct it.
>
>     tmpfs   /tmp    tmpfs   nodev,nosuid,size=50%      0  0
[…]

To prolong SD card life I've tried to put /var, /tmp and /home on a USB
2 stick, but this became too slow or good desktop use.

It seems that the /home partition causes a lot of lag when put on USB 2.
The /tmp partition on USB 2 also causes some lag. It did not seem to matter
if /var was mounted on the SD card or on the USB 2 stick.

Your 'tmpfs' setting (for speed), with only /var (to prolong SD card life)
on the USB 2 stick, seems like it might be a good choice.
--
Raspberry Pi 4B, 4 GB.

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