RVP a écrit :
> On Fri, 5 Feb 2021, Michael van Elst wrote:
>
>> vm.bufcache is 15 (percent) by default. On your 16GB machine that
>> means that I/O of up to about 2GB may look fine, but
>> if you move more, things will crawl.
>>
>
> That's intriguingly like what we are seeing here, isn't it?: "small"
> I/O transfers of 1GB easily exceed 100MBPS; but 10 GB ones get
> capped at 10MBPS.
>
> On Fri, 5 Feb 2021, BERTRAND Joël wrote:
>
>> To be sure that this issue does come from qNAP NAS, I have tried to
>> replace this initiator by another one (a Linux iscsi initiator)
>>
>
> You installed the `netbsd-iscsi-initiator' package?
Nope. There is a /usr/sbin/iscsi-initiator provided by NetBSD itself.
>> and result is very similar. That's being said, qNAP runs with a Linux
>> kernel...
>>
>
> Any antivirus stuff running on the NAS or on legendre which would
> process 1GB files quickly, but would struggle on large 10 GB ones?
I don't have any antivirus.
> And any other filesystem monitoring programs running which would
> wake up and start ingesting newly-created files for some reason?
> Indexers, cataloguers...
No.
> Any special processing on the NAS which says: if data is from
> legendre's IP, run the data through some program X?
No... There is no special processing.
JKB
