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RB750 really high sector writes

Posted: Fri Dec 22, 2017 8:05 am
by bobe84
RB750, puzzled with high sector writes...
It has dhcp on it + pppoe link. Main purpose internet gateway.
I have no graphs and option is set to 1h
Everything else seems to be set to write to memory...
All service ports closed except winbox.
I did netinstall and did setup from scratch.
Any sugestion?

Re: RB750 really high sector writes

Posted: Sat Dec 23, 2017 2:53 am
by sebastia
Do you store dhcp leases on disk?

Re: RB750 really high sector writes

Posted: Sun Dec 24, 2017 9:20 pm
by bobe84
No dhcp leases are not stored, no graphs every service is disabled except for winbox(which is only accesible from internal network). Latest software 6.41 and still same. Really puzzled at what could it be... I can export whole configuration.
I got hap lite with almost same configuration and it has minimal sector write.
Can this rate of write kill the storage?(this is my main concern) After 2d 4h uptime i have ~1100 sector writes.

Re: RB750 really high sector writes

Posted: Mon Dec 25, 2017 5:27 pm
by sebastia
What I would be checking
* logging: all topic
* dhcp server
* scripting: any regular "reconfigurations", write to file, ... as part of script?
* accounting?
* proxy cache?
* dns updates?

Any config changes will result in writes.

Re: RB750 really high sector writes

Posted: Mon Dec 25, 2017 7:37 pm
by bobe84
Anyway i did export, if anyone is interested and has knowledge please look at the export.

Re: RB750 really high sector writes

Posted: Mon Dec 25, 2017 8:01 pm
by BRMateus2
From what I see, there is nothing wrong with your settings, place in the CLI/Terminal this command just to be safe:
/tool graphing set store-every=24hours
I do graph things every 24hs and the average writes per day is 3500. If I don't graph, the average is about the same as yours.
This seems normal.

Re: RB750 really high sector writes

Posted: Mon Dec 25, 2017 11:52 pm
by bobe84
Thank you, i got freaked out because i have hap lite on other location and it has so minimal sector writes compared to uptime and rb750.
I don't have graphs.

Re: RB750 really high sector writes

Posted: Tue Dec 26, 2017 2:07 am
by BRMateus2
The architecture is different, even the software package sizes are different; can be related to kernel or even supout internal debug logging.

Re: RB750 really high sector writes

Posted: Thu Dec 28, 2017 2:21 pm
by Paternot
Can this rate of write kill the storage?(this is my main concern) After 2d 4h uptime i have ~1100 sector writes.
It was stated here by Normis, if I'm not mistaken, that the flash used by Mikrotik is rated to 100k writes/cell, and uses wear leveling. If your device has 16MiB of internal storage, and considering each cell is 1KiB, it would leave you with 16000 cells. They may be 512 bytes - that would give you two times more cells.

100000 x 16000 = 1600000000 writes. I would be conservative, and slash it to 1/10. So, 160000000.

At the present rate, of 550 writes/day, it would give you

160000000 / 550 = 290909 days. Something like 797 years.

With these numbers, even if the stated life would be 1/100 of the official statement, I'd say You should be fine.

Re: RB750 really high sector writes

Posted: Sun Dec 31, 2017 6:40 pm
by bobe84
Thanks for reply! So no worries about rb750. btw it has 64mb of storage.