Print

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

[jedimark]

Hi guys,

I've got a DNS-320 with crummy performance issues.

Read speed hovers around 5Mb/s, Write is around 20Mb/s.
In raid 0 configuration, it's about 10Mb/s, and write is still around 20Mb/s..

Currently I've got all my drives blank as I'm trying to get to the bottom of this, I've got three sets of drives to test with, the problem exists on all of them. All have been tested and are performing decently outside of the NAS.

2x 2tb Western Digital Green WD20EARS
2x 2tb Seagate Baracuda LP Green
2x 1tb Western Digital Green WD10EAxS

First I thought it was networking, The NAS is connected to my gigabit Billion 7404VNOX router, and I am accessing from my Acer Win7 Notebook and an Mid2011 iMac, which both are gigabit. I've tried bypassing the router directly with a cable. No difference in performance.

I have tested with cat5 & cat6 cables, makes no difference.

I have tried firmware 1.02 & 1.03.. Tried connecting via FTP/NFS/AFP/WebDav same crummy read performance.

I have played with fun_plug trying to get some more info out of it.

time dd if=/dev/zero of=/mnt/HD/HD_a2/tmp.img bs=1M count=1024
takes around 19 seconds to write 1Gb of zeros.

time dd if=/mnt/HD/HD_a2/tmp.img of=/dev/NULL bs=1M count=1024
takes around 150 seconds to read the data back, (off any drive I do this on)

I have since removed fun_plug, and performed a factory reset, reflashed the firmware back to 1.02, zero filled and formatted all the drives, and still getting the same performance problems.

I've also tried jumpering my drives in various configurations to lock Sata 1.5 (don't know why I bothered) and the 4k sector settings. All configurations worked, but no difference in read speed.

Is this a faulty unit or is something horribly wrong with the last couple of firmwares? Have I missed anything obvious?

I've got an ancient 233mhz 486 Airlive unit that performs better over 100mbit ethernet.

[JavaLawyer]

Please see the following post for a detailed throughput report assembled by another forum member: http://forums.dlink.com/index.php?topic=51588.0

[jedimark]

I just discovered should have retried the Sata 1.5 compatability drive jumper _after_ I downgraded the firmware.. And to think I felt stupid for doing it in the first place.

So at least my WD drives work.. I'll have to test the same thing works on the Seagates.

My read speed is now a much more healthy 40-60MB/s (on a raid0 mind you, not brilliant, but ok).. Write is still only 20MB/s, but I couldn't care less.

Something appears to be wrong with how the DNS-320 (EDIT: Or the harddrive) negotiates the SATA 1.5/3.0 link speed?

[jedimark]

oooookay... My (newer) 2TB Seagate Baracuda green drives don't have such a jumper..

however plugging them in again after the WD ones, and I'm still getting 40+Mb/s

Very confused! I officially have no clue what the heck was going on.. o-O

But I'm not complaining.

[ivan]

jedimark, just a bit of advice.  If you stick with RAID 0 make sure you have a tested backup because if one of your disks fail you have lost everything on that RAID array.

A possible cause of your initial problem could be firmware (latest is slower) or it could have been a network cable plug that was not seated fully - we had that problem at a clients where for some unknown reason someone would unplug the network cables and someone else would just push them back in the sockets without checking they were seated fully, we fixed it with a little super glue

[albert]

TS, is your NAS DNS-320L as DNS-320 doesn't have firmware version 1.02 or 1.03 as stated in your initial post?