NASLite Network Attached Storage
Task-specific simplicity with low hardware requirements.
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PostPosted: Fri Apr 15, 2005 5:26 am 

Joined: Tue Mar 29, 2005 12:56 pm
Posts: 15
I run NAS on a met@box (bargain at 30$, Cyrix 75x4=300MHz, 64MB, 6GB). Since I use DSL over a router in the network, my Win MTU is 1464 (verified as best value with the ping -f methode), and NAS MTU is 1500 by default.

From Win to NAS I get 2-3MB/s (NAS is writing)
From NAS to Win I get only 1 MB/s (NAS only reading)
From Win to another Win reading and writing are the same, 2-3MB/s.
I suppose its because packets from NAS to Win have to be fragmented.

Since I am using VOIP and FTP, I do not want to set the Win MTU to 1500, this would spoil my precious upload speed. I want to set the NAS MTU to 1464 instead.

Can I do this? And how??

Thank you!

Edit: Solved. I stumbled across some postings about the SMART self test. That was it, self test was running and spoiled the transfer rate.

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PostPosted: Sat Apr 16, 2005 5:45 pm 

Joined: Sun Feb 27, 2005 11:08 am
Posts: 225
for reference changing the MTU is onyl realy relevant on devices connecting to not ethernet networks e.g ADSL router onto the net.

1500 is correct for ethernet networsk alhtough i have seen a couple of dodgy firewalls that like differernt MTU sizes on ethernet.

PostPosted: Wed Feb 29, 2012 8:41 pm 

Joined: Thu Mar 09, 2006 2:55 pm
Posts: 26
I know this is an old post but the posts deserved some clarification so here goes...

MTUs larger than 1500 are not atypical and used only for non-Ethernet connections and\or ADSL as the previous poster stated. With the advent of GE and beyond, MTUs set at 1500 cause a waste of bandwidth - basically, at that setting, you will never get more than 70% true payload utilization. With jumbo frames, you can get much higher.

Do the L2\L3 math and you will see why.

With that said - and please know that I understand NL has a very clear set of specifications in a very nice footprint - but it would be a nice feature request to allow jumbo frames. I also understand that implementation may be problematic but if possible, it would be nice.

Just my .02...

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