MTU settings not persistent in LACP mode

[Kivas]

Hi,

I faced some "slow" network performance (18mb/s) while writing to my NVX Business. I found that there was heavy packet fragmentation.
So I changed the MTU in Frontview from 1500 to 1492. That boosts the writing speed by factor 2.5 (~ 45mb/s)

The problem : the MTU setting is not persistent. After reboot of NAS the setting is back to 1500.
Why ? Is there a way to force the MTU to 1492 on boot via e.g. some init script ?
Changed MTU stays while running in the network in non-teaming modes.

NVX is running in 802.3ad LACP (Layer2)
RAIDiator 4.2.24

thx & regards
Kivas

[StephenB]

I'm not sure why the setting isn't persistent.

Do you know why your other equipment requires the MTU to be 1492? What switch are you you using?

[Kivas]

Hi,

that MTU changes are not persistent looks like a real Bug.

Why my network needs that change....I can´t answer...I´ve already spent hours on that. My guess is that there is some strange behaviour in Windows 7 and my network cards or some problem with SMB and MTU, or or or. But I gave up on this....
Switch was a Netgear GS108Tv2 and is now a DLink DGS-1210-28 - but makes no difference.

Regards
Kivas

[StephenB]

Did you attempt to probe the path MTU with ping?

ping NASIP -f -l -1472

and

ping NASIP -f -l 1464