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[mjzglr]

I'm glad that the forum seems active and people are reporting speed issues.

I recently bought the DNS-321 and could get at most 5-7MB/s over gigabit ethernet. I've tried SMB and FTP, EXT2 and EXT3, Raid 0, Raid 0, JBOD, Firmware 1.2 and 1.3 ... it's all been bad. I've even run a crossover between the NAS and my PC so no switch was involved. I've been extremely disappointed and even more so with the e-mail support. 6 e-mails back and forth and the only suggestion I've gotten was to reset my router - LAME.

What I don't understand is that smallnetbuilder has both the DNS-323 and DNS-321 at about 15MB/s http://www.smallnetbuilder.com/nas/nas-reviews/30521-move-over-dns-323-d-link-dns-321-reviewed?showall=&start=3 with a unit that DLink supplied. What gives for the rest of us?

I had an expectation that performance would be around what was in the review. Clearly it is not and DLink won't support the device. Had I known that transfers would be less than half of what the reviewers got I would have gone with another product or just kept my own home built box.

[jamieburchell]

Jumbo frames?

[gunrunnerjohn]

For reasons I'll never understand, I can't seem to get any benefit from jumbo frames, they actually slow things down.  I know something must have been added to the network to affect things, because they used to give me about a 20% boost.  I've tinkered and tinkered, and jumbo frames slow all my boxes down, including the Synology.  I even bought a new 8 port gigabit switch in hopes that something about the switch was the issue, no sale.  The packets seem to get through, and I can do ping tests end to end and verify that jumbo packets are capable of being passed, but they still slow things down.  I have tried it from three different hosts, same issue.

If I ever get time, I may go after this again, but it's clear that something is amiss in jumbo-land.

[mjzglr]

I've tried jumbo frames and haven't had any success either.

One thing to be aware of is that all frame sizes aren't necessarily supported by your card. I have one of the Intel Pro/1000 cards and it only supports 9K frames. So be careful and make sure to match your frame size with something your card can support.

[gunrunnerjohn]

Well, the really odd thing was that at one time jumbo frames made about a 10-15% improvement.  I have the same machines, the same set of gigabit switches, and the same NAS, and now they reduce my performance!  I was using 4k jumbo frames, but I tried 4k and 9k with the same results.

Obviously, something changed in the network that affects it, but I'll be damned if I know what it was.  Pings across the infrastructure with a 9k packet work, so I know the switches are passing the jumbo packets.

[Tank_Killer]

I found 10% increase with jumbo frames.  I found a variety of things affect jframe affecttiveness.

Flow control in a mixed 100/1000 enviroment, shutting it off in the switch AND client seemed to improve affectiveness.

How much broadcast traffic you have on your network (especially with flow control enabled)

Length of cable run to the client (dunno why but i get better performance from a longer cable)?

The quality of your switch, I have had a regular gb switch (that passed 9k frames) that i got poor performance from.  However after i replaced it with my lvl2 managed switch (which allows me to control broadcast traffic and flow control) jframes helped alot.

Clients NIC quality + drivers

The size of files you are transferring, as with any transfer.  Its more affective on 50mb+ files.

[gunrunnerjohn]

Hard to know what the difference is.

[net_tech]

I have 2 Seagate 1TB drivers (ST31000333AS) in my DNS-323 in Raid1 configuration. DNS-323 has jumbo frames enabled and MTU set to 9000. DNS is connected to a Linksys SRW2008 switch, which has jumbo frames enabled. Spanning Tree is also enabled in the switch, but don't think it would affect the performance in any way. I also have a computer Vista 32bit Pro with 10/100/1000 Atheros AR8121/AR8113/AR8114 NIC connected to the same switch. Trying to copy a 2GB file from DNS to the internal HDD of the workstation gets me 9-10mb/s, which is somewhere around 70Mb a sec.

Does anybody know what can be done to get speeds close to 15mb mentioned in the 1st post of this thread?
Thanks

P.S. DNS is not being accessed by anyone else when I copy files, nor does it have anything scheduled for downloading under applications.

[gunrunnerjohn]

For the DNS-323, did you try disabling jumbo frames.  That's what the configuration is in that post you reference.

[jamieburchell]

Just thinking out loud here, but if you adjust the MTU size on the DNS-323, shouldn't you also adjust it on your network interface card to match, otherwise you'll get lots of fragmented packets and performance loss. Wireshark or similar should identify that as the cause.

You can change it on the cmd line using a command such as

Code: [Select]

netsh interface ipv4 set subinterface "Network Connection" mtu=xxxx store=persistent


[gunrunnerjohn]

Obviously, you have to have all the MTU's matching in the system.

[beefy314]

How is the DS210+ different from the DS210j?

[jamieburchell]

How is the DS210+ different from the DS210j?

Spelling




.. and other things
http://www.synology.com/enu/products/DS210j/spec.php
http://www.synology.com/enu/products/DS210+/spec.php

[jamieburchell]

Obviously, you have to have all the MTU's matching in the system.

How does that work, when your ISP tells you to make sure the router's MTU is the same as your computer's MTU? And the ISP usually has a specific MTU they want you to use.

[gunrunnerjohn]

The router's WAN MTU has nothing to do with your network and jumbo frames.