Re: [mh] Misterhouse on Raspberry Pi?

Our discussion about SD cards on Raspberry Pi motivated me to get an SSD for my mail server. I thought I should back it up just in case I goofed the transfer. Boom!  My SD failed during the backup. Though I was able to rescue most of the files, I wasn’t able to transfer them to another SD, so I had to rebuild. Which I did. 

I acquired a USB SD card adapter; with it I can create a bootable clone of my main SD (before my slightly risky migration to SSD). I like idea of this method as it doesn’t require me to power down a tired, suspect SD card to back it up. 

Cheers 

Sent from my iPhone

> On Jan 27, 2021, at 4:40 AM, Lieven Hollevoet <[email protected]> wrote:
> 
> Hey Joel,
> 
> the Samsung T5 is a portable SSD so it has its own USB-C interface on board. Just plug in the USB cable and you’re set.
> 
> Best regards,
>  Lieven.
> 
>> Op 26 jan. 2021, om 21:54 heeft Joel Davidson via misterhouse-users <[email protected]> het volgende geschreven:
>> 
>> Lieven,
>> 
>> What interface do you use to attach the SSD to the pi?  Is it just a
>> generic usb-sata adapter cable?
>> 
>> For those who want to stick with an SD card for their mh pi, would it
>> be worth adding a config parameter to specify the object save period
>> rather than everyone having to individually change the code in bin/mh?
>> 
>> Joel
>> -- 
>> Joel Davidson
>> Austin, TX
>> 
>> 
>>> On Tue, 26 Jan 2021, it would appear that Lieven Hollevoet wrote:
>>> 
>>> Hey Tom,
>>> 
>>> I?m using Samsung T5 SSDs. They are detected fine, and TRIM support is working as expected on them for the wear levelling under Raspbian.
>>> 
>>> They are much faster than SD and should last as long as they serve in my regular computers (8 years and counting ;-) ).
>>> 
>>> For Rpi devices that run a single specific task I use an SD card (e.g. picoreplayer, collecting data from my digital electricity meter and pushing that over the network to a database, ...). 
>>> For the more ?server-like? Rpi devices that benefit of faster storage (database, Misterhouse, water station data collector, zigbee gateway all running on a single RPi4) I use an SSD. Regarding cost: a good 64 GB SD costs ?20 euro, a 500 GB SSD costs about 70 euro if you can grab them on a good moment. Worth it in my opinion.
>>> 
>>> Best regards,
>>> Lieven.
>>> 
>>>> Op 26 jan. 2021, om 21:00 heeft Tom MacLean <[email protected]> het volgende geschreven:
>>>> 
>>>> What type of SSDs are you running?  What is the storage technology within?  Aren?t they flash drives just like SD?
>>>> 
>>>> The joy of RPis are that they are so cheap you can have 10 of them, but if your storage cost per Pi goes up the business case is less good. 
>>>> 
>>>> Sent from my iPhone
>>>> 
>>>>> On Jan 26, 2021, at 11:51 AM, Lieven Hollevoet <[email protected]> wrote:
>>>>> 
>>>>> Hey Tom,
>>>>> 
>>>>> confirming this. Of the 10 the RPis I have running on SD cards (the others are already on SSD) I experienced 2 SD card failures that resulted in read-only behaviour of the card. So no data was lost in the end. Cloning to a new card and rebooting got me up and running again.
>>>>> 
>>>>> This is over a timespan of 3 years, devices running 24/7 with no specific optimisations to reduce the number of writes.
>>>>> 
>>>>> I?m using large enough 32 of 64 GB Samsung Evo Plus cards
>>>>> 
>>>>> Best regards, 
>>>>> Lieven.
>>>>> 
>>>>>> Op 26 jan. 2021, om 01:30 heeft Tom MacLean <[email protected] <mailto:[email protected]>> het volgende geschreven:
>>>>>> 
>>>>>> Hi Brian,
>>>>>> 
>>>>>> I did absolutely nothing to reduce the writes to the SD.
>>>>>> 
>>>>>> I can?t tell what the failure is, I perhaps what I see is the normal ?worn out? behaviour. I can say that the last time it died it did so the same way. (Losing recent file charges)
>>>>>> I had updated my password a few days ago, and after rebooting it wouldn?t take my new password; it had reverted. 
>>>>>> 
>>>>>> I think the noatime change might be worthwhile, also slowing the logging interval. 
>>>>>> 
>>>>>> I?m willing to change the SD a few years. My config is saved with git. 
>>>>>> 
>>>>>> Cheers,
>>>>>> Tom
>>>>>> 
>>>>>> Sent from my iPhone
>>>>>> 
>>>>>>> On Jan 25, 2021, at 5:19 PM, Brian M <[email protected] <mailto:[email protected]>> wrote:
>>>>>>> 
>>>>>>> 
>>>>>>> I've been really appreciating folks posting their experiences running solely on the microSD.  I don't run my vital RPis that way, because I didn't know what to expect, so this is good information.
>>>>>>> 
>>>>>>> Tom, did you do anything to reduce write traffic to the microSD? Setting "noatime" in /etc/fstab eliminates a lot of writes, because everytime a file is *read*, the access time is updated(written). I've heard of people making /var/log a tmpfs file system (if they don't need their logs), optionally sweeping them to the SD card on an hourly basis. Removing swap and installing zram instead would help (but beware the current 8G bug in zram if you have an 8G RPi 4). Did you do any of these things, or others?
>>>>>>> 
>>>>>>>                          -Brian M.
>>>>>>> 
>>>>>>>> On 1/25/21 12:28 PM, Tom MacLean wrote:
>>>>>>>> I was going to chime in that I just run MH on the microSD without issues, but I just had a failure (on a 4 year old SD), my second such failure. Same as last time: the system boots fine, MH runs without issue, but none of my file changes persist after reboot. It?s just writing to the SDs buffer, not to the flash. 
>>>>>>>> 
>>>>>>>> 4 years isn?t too bad though. 
>>>>>>>> 
>>>>>>>> Sent from my iPhone
>>>>>>>> 
>>>>>>>>> On Jan 23, 2021, at 10:32 AM, Giles Godart-Brown <[email protected]> <mailto:[email protected]> wrote:
>>>>>>>>> 
>>>>>>>>> 
>>>>>>>>> I've just had a go at tidying up the Wiki for Raspberry Pi (https://github.com/hollie/misterhouse/wiki/Raspberry-Pi <https://github.com/hollie/misterhouse/wiki/Raspberry-Pi>), moving many of the optional bits onto separate pages so it doesn't look so daunting and adding things I've found during my many installs.
>>>>>>>>> 
>>>>>>>>> Giles
>>>>>>>>> 
>>>>>>>>>> On 23/01/2021 12:55, Richard F wrote:
>>>>>>>>>> When I started using an SSD over a decade ago or so (when burning out SSD's was a big concern, as lifetimes weren't initially specified/trusted), I reduced mh data saves by a factor of 5 (in the mh file itself in /bin), like so, which has served me well:
>>>>>>>>>> 
>>>>>>>>>> &object_states_save if &new_minute(5) and !($Time_Start_time or $Time_Stop_time); 
>>>>>>>>>> #    &object_states_save if $New_Minute and !($Time_Start_time or $Time_Stop_time); # Skip if in accelerated mode
>>>>>>>>>> 
>>>>>>>>>> My current Samsung SSD has 81000 hrs on it - over 9yrs - and still 78% of its life left according the smartd.
>>>>>>>>>> 
>>>>>>>>>> I'd also be interested in a Pi guide as that may be the eventual mh destination.  I'm a big fan of the Picoreplayer which has a great feature of running totally from RAM once booted, so you can switch it off without worries.  Though mh needs to write status, I could forsee a picore or similar mini distro that includes mh, and saves its config/recovers (if lost) to network storage or cloud.
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>>> On 21/01/2021 7:54 pm, Gianni Veloce wrote:
>>>>>>>>>>> hi guys
>>>>>>>>>>> as my old Ubuntu laptop running MH is almost broken i am looking to move to Raspberry Pi.
>>>>>>>>>>> is there any detailed guide how to setup MH on Rpi?
>>>>>>>>>>> and are any hints to avoid the abuse of the SD card with writes from the OS and MH?
>>>>>>>>>>> Would installation on a USB drive help in this?
>>>>>>>>>>> TIA 
>>>>>>>>>>> GV
>>>>>>>>>>> 
>>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> 
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>>>>>>>>>> 
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>>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
>>>>>>>> 
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>>>>>>>> 
>>>>>>> 
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>>>>>> 
>>>>> 
>>> 
>>> 
>> 
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