Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[ruans11]

I just got a DNS321 and setup with 6k jumbo frame, ext2 formated 1.5TB hard drive. I use a 2GB file to test the speed. the write to DNS321 speed is about 18MB/s, but read from DNS 321 is only about 10MB/s. anyone know it read speed is so slow compare to others? I install the funplug and telnet into DNS321 to see the CPU usage. when write to, it is ~80%. when read from, it only use ~30%.

Thanks,

[JoeSchmuck]

Doubt this will fix your dilema but did you also set your computer ethernet connection to 6K jumbo frames?

I'm running 4K jumbos myself.  You could try to drop those frame size to see the impact.  The only other think I can think of is maybe your Antivirus program is scanning the data before writting it.  Try disabling the AV if you can.

-Joe

[ruans11]

I have two computer all set to 6K jumbo frames one is vista other is windows 7. between the PC, the copy speed can reach to 70~80MB/s. other interesting behaver of the DNS321 is if both PC copy the same file at same time from the DNS321, both copy can reach about 9MB/s that is total 18MB/s but single copy only 10MB/s . inside DNS321 two smbd run at ~30% load each when make two PC copy the same file.

Thanks,

[JoeSchmuck]

Have you tried a direct connection of the NAS to a single PC?

I'm trying to rule out hardware because I just don't see why it would be so slow to read.

And you were getting that speed before installing funplug, right.

I guess the last thing two things to try is, reset NAS to defaults, and try a different modle hard drive.  It doesn't need to be a large drive, just a different model.

I hope you are able to figure it out because I'm out of ideas at this time.

-Joe

[ruans11]

tried with direct connection of the NAS to a PC, got same result. tried a different brand hard drive with no difference. firmware 1.02, 1.03 get same result. funplug not affect anything, nothing works    

Thanks,

[JoeSchmuck]

I ran a few tests on my NAS and computer and my Write is ~18MB/sec, Read is ~13MB/sec with 4K Jumbo set on both my NAS and my computers network adapter.  At 9K the write stayed the same but the read dropped slightly.  I won't speculate to the cause as I'm not a network guru and don't know much about packet collisions, etc...  My network adapter only supports 1.5K, 4K, and 9K.  But I tried setting the NAS to 5K, Network adapter at 4K and guess what, my read speed jumped up to 14MB/sec (some peeks at 16MB/sec) while write dropped down to ~17MB/sec.  Odd for sure since I didn't expect a speed up on the read but the write did take a slight performance hit.  I was transferring 1GB VOB files and the speed was the one Windoze 7 reports during the file transfer.

One thing I did note, when there was file fragmentation (the hard drive was moving the heads around allot), the read speed dropped.  I'm running a RAID1 setup, EXT2 formatted drives.

Why don't you make the changes I suggest which are, MTU on NAS 5K, MTU on your network cards 4K, try transferring a 1GB file and see what your speeds are.  I will leave mine like this for a while and test it again later to see if the speed holds and then switch back to 4K on the NAS.

One thing I don't know is that the NAS displays 4000 and 5000, it all ends with an even thousand number.  I'm curious if they are the actual numbers the MTU is using or just represent 4096 and 5120.  I would like to see those values changed to the standard used.

-Joe

[gunrunnerjohn]

One thing I don't know is that the NAS displays 4000 and 5000, it all ends with an even thousand number.  I'm curious if they are the actual numbers the MTU is using or just represent 4096 and 5120.  I would like to see those values changed to the standard used.

-Joe

I've always wondered about this as well.

[ruans11]

finally use firmware 1.01 I can get about 19MB/s read and 16MB/s write for big file. 1.01 is much fast then 1.03 for reading.
I have test all the combination for the jumbo frame size. the best is 6k-6k setting. I think the network setting is good and the problem is NAS firmware. I used to have a Maxitor MSSII NAS at same network can get 26MB/s read and 16MB/s write. the MSSII have same 400MHz CPU and 64MB memory as  DNS321.

[JoeSchmuck]

Hey, glad you were able to make things work nice a fast.  Too bad you had to revert to 1.01.

Bet if we could get a stripped down version of the software, maybe only with a few features, that would increase throughput.  I do think some of the features are nice but I'd like to see those set up as maybe a fun plug extra.

Well I've got the 1.01 version of the code, maybe I'll take a gander at it over the next few months.  One big fix I know I'd have to incorporate is the hard drive issue fixed with 1.03.

[MikeRuf]

JoeSchmuck,

Any updates on the performance problems with firmware version 1.03? I'm seeing the same problem with my DNS-321. I was running 1.02 and only getting about 10 MBytes/Sec.

After hours on the phone with D-Link, I finally got to a product specialist and learned that 10-12 MBytes/Sec. is the expected performance level. It sounds like the subsystem that manages network traffic is the bottleneck. I was told that the engineers are currently testing a new version of the firmware that should improve performance.

[stoopid]

I'm also experiencing disappointingly slow transfer rates, read and write.  It's a great little device for what it costs, but the transfer rates are a joke and it's obvious the inclusion of gigabit is just for namesake.  I'm getting typical 100mbps transfer rates.

I tried the jumbo frames settings on all gigabit devices on the home network and actually saw a slight drop.  1500k seems to work best for my setup despite having a switch and PCs NICs capable of up to 9k frames.  I immediately updated to 1.03 firmware as my 2 x 1.5TB drives wouldn't install with 1.00

I know my internal network isn't the issue - the NAS replaces a Vista home theater ("server") gigabit machine and the transfer rates were pretty insane (30+mbps read/write).  I'll miss these speeds but for the compromise I'm willing to keep the dns-321.  It's a great storage device, and with the p2p and ftp capabilities it's completely replaced my home 'server'.  Having raid1 is just bonus.

[gunrunnerjohn]

I had my best results with 4k jumbo frames, you might give them a try.  You should be able to do slightly better, perhaps in the mid teens.

[stoopid]

I gave 4k jumbo frames another try and they MAY have helped, pushed 10mbps last night on a large transfer.  This was read speed.  It's not horrible but it's not what I expected.

[gunrunnerjohn]

Well, with firmware 1.03, a RAID-1 array, gigabit all around, and 4k jumbo frames, I'm only getting about 11mbyte/sec from my DNS-321 reading a 690mbyte file.  Maybe this is it, haven't done this benchmark lately.  I think with no RAID I used to get around 14, so I don't know what changes.

[stoopid]

Well, with firmware 1.03, a RAID-1 array, gigabit all around, and 4k jumbo frames, I'm only getting about 11mbyte/sec from my DNS-321 reading a 690mbyte file.  Maybe this is it, haven't done this benchmark lately.  I think with no RAID I used to get around 14, so I don't know what changes.

The shock is using the same network setup with the only change being the NAS and losing 20+ MB/sec.