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DSM 7.1 MailPlus causing repetitive disk noise

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2
0
NAS
DS720+
Hey there,

just set up a new DS720+ and chose MailPlus/MailPlusServer instead of MailStation that I used with my previous diskstation (for better webmail amongst other reasons).

This works all fine so far, but, as long as I have MailPlus running, both disks (some WD red I took over from the old DS, but reformatted with btrfs) have continuous, repetitive disk access that can be seen with both LED blinking in a constant frequency and also can be heard as a constant rrrt-rrrt-rrrt-rrt noise. Of course there can always be disk access, but this is completely "unnatural" in its constant, repetitive character.
I can clearly assign this to MailPlus - as soon as I stop it, the disks have only the typical, "random" accesses from time to time. Using
Bash:
sudo htop --sort-key IO_WRITE_RATE
I was able to assign it to two synomailclientd processes that have a write rate of about 2-3MB/s all the time.

There is no network traffic and no disk read access, so I have no clue what kind of data should be written here all the time (3MB/s sum up to > 200GB / day, that never appear in additional disk usage though).

I'm really frustrated about this. Support says "this is how synomailclientd is supposed to work", but I doubt they ever really looked into it - no software developer would accept his tool behaving like this when there is no traffic at all. I disabled all indexing options I was able to find.

Anybody here who saw similar behaviour? Or who has an idea how to further debug this? Or on how to get a completely fresh MailPlus without losing my mails?
Can anybody imagine that my disks cause this trouble as they are not on the compatibility list? I cannot...

Is this the right forum or should I go to some more general "software/system problems" forum as this is more about weird system behaviour than about MailPlus usage and configuration maybe...

Thank you very much
Ben
 

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