How to lower disk writes (for extending life of an sd card)

[paul53]

@apollon77 sagte:

this will be likely hard when you do not only use device values, but also logical values.

A reboot / killing of ioBroker immediately writes the states from RAM to the file. Only in case of a system crash (power failure) such a long time is problematic.

[apollon77]

@paul53 ... or a process crash (yes there is come code that tries to write it also when crashing) ... but (e.g. a SIGTERM because of OOM might also not write values).

It is all about "knowing what one is doing"

[Tomasz Nowak]

@paul53 , @apollon77
Thanks for your hints, guys. For now I'm just handling Ecovacs Deebot vacuuming robot (and Daikin aircon soon, probably) over MQTT with no logic within ioBroker. So I hope I don't risk any house disaster with that setting

@paul53, I've created an issue, thanks.

[Dutchman]

just as suggestion, to avoid load read/write loads on storage and move the to Memory isn't Redis providing more efficient state handling here ?

[Tomasz Nowak]

I thought about it but AFAIK Redis also needs to write to disk / sd card. I have relatively small number of states so I believe creating yet another docker instance for Redis would be kind of overkill in my case.

[Mic]

@Tomasz-Nowak
I am using Redis successfully for several months. I have installed it on the same system (Debian) on which ioBroker is installed - but no Raspberry experience (I am using a Zotac barebone with Proxmox), though.
See: https://github.com/ioBroker/ioBroker.js-controller#state-and-objects-databases-and-files
Also, see: https://redis.io/topics/persistence
You may want to look into it again, but not sure how the performance is gonna be on a Raspberry.

[Tomasz Nowak]

@Mic
I've read that before. They say good for many objects such has 10000 for performance reasons. I have like 50 objects
And I don't want make it more complex (you don't install another services in docker instance, you need another docker)

[Dutchman]

guys wait ...., don't ix performance and io topics please

we are discussing write access to storage, Redis works in memory so less write on disk/card was my hypothese

[paul53]

@Dutchman sagte:

Redis works in memory so less write on disk/card

Per default Redis writes every 5 minutes to disk/card.

[Dutchman]

@paul53 sagte in How to lower disk writes (for extending life of an sd card):

@Dutchman sagte:

Redis works in memory so less write on disk/card

Per default Redis writes every 5 minutes to disk/card.

Better than every 30 seconds

[Mic]

@Dutchman sagte in How to lower disk writes (for extending life of an sd card):

Better than every 30 seconds

Exactly, and the default value can certainly be increased to whatever is needed. I would give Redis a try.
Also,
@Tomasz-Nowak sagte in How to lower disk writes (for extending life of an sd card):

They say good for many objects such has 10000 for performance reasons

I would assume this statement in the documentation was just made for the ease of use of ioBroker in general: Without like Redis, typically ioBroker's performance is good if you have way less than 10000+ objects. You are having a different use case (limited disc r/w per period). Not sure how the performance (like CPU and memory usage) of Redis is on a Raspberry, but I guess pretty low.