Slow transfer speeds on gigabit network

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WAM69
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Re: Slow transfer speeds on gigabit network

Postby WAM69 » Thu Nov 09, 2017 11:18 pm

Increased MTU on my iMAC and Synology DS414 box, still mostly seeing rates less than 30MB/s with brief bursts up to 35MB/s (large files).
The network performance appears to be being offloaded to CPU on the Synology - as soon as I start a transfer the CPU jumps from <5% to over 90% before settling down to hover around 80%.
It's probably only going to take me another day or two to upload my files to the Synology - which I'm using mostly as an archive. I have a second copy (backup) of all files on USB disks - if I really need performance in future I can use them.

Note: I work as a Linux systems administrator (HPC). Jumbo frames really help with NFS on the 10Gb/s and 40Gb/s networks that I manage. I don't have any trouble surpassing 100MB/s over switched GbE networks with an MTU of 1500 at work. It's an unfair comparison though: one of the storage arrays I manage has close to 1Tb/s of backend (224Gb/s of frontend) connectivity per controller while the network cards cost more than my Synology NAS.
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Re: Slow transfer speeds on gigabit network

Postby lburns » Fri Nov 10, 2017 2:22 am

Okay,

So, my setup is a DS2415+
Using 4x1GB links in a bond (you can only get 1GB per PC though with 4GB max from the point of view of the unit).
I have two 450GB SSD disks as a frontline cache and 5TB disks filling the balance of the unit.
JUMBO frames everywhere
I get a SOLID 1400Mb/sec on all my transfers.

Without Jumbo frames I get variable rates maxing out at 900-1100Mb/second

I am passing this data from my computers in the house over wired 1Gb links through two switches, and the two switches are linked with a 10GB fiber link.
However I achieved the same speeds on the bench between a PC and the Synology BEFORE i put the switches in place and ensured they had plenty of headroom for the traffic.

Prior to this I was 35 Mbit/sec to an iSCSI target (Promise technologies)
WAM69
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Re: Slow transfer speeds on gigabit network

Postby WAM69 » Fri Nov 10, 2017 2:52 am

Now copying from USB disks (backup) connected directly to the NAS. Getting my initial upload completed much quicker now.
Have people who are getting ~100MB/s made any network configuration changes on their Synology and/or connected device other than Jumbo frames?
lburns
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Re: Slow transfer speeds on gigabit network

Postby lburns » Fri Nov 10, 2017 3:40 am

WAM69 wrote:Now copying from USB disks (backup) connected directly to the NAS. Getting my initial upload completed much quicker now.
Have people who are getting ~100MB/s made any network configuration changes on their Synology and/or connected device other than Jumbo frames?


Aside from my config i have listed above - Nope.
WAM69
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Re: Slow transfer speeds on gigabit network

Postby WAM69 » Fri Nov 10, 2017 4:31 am

I briefly went back to solely network transfers - getting between 15MB/s and 20MB/s now (direct connection with Jumbo frames on at both ends).
No extra software installed on NAS. Very little configuration done, so it's pretty much an "out of box" setup I have.
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Re: Slow transfer speeds on gigabit network

Postby lburns » Fri Nov 10, 2017 5:09 am

WAM69 wrote:I briefly went back to solely network transfers - getting between 15MB/s and 20MB/s now (direct connection with Jumbo frames on at both ends).
No extra software installed on NAS. Very little configuration done, so it's pretty much an "out of box" setup I have.


Can you please post your storage configuration including RAID type, file system, and network config, etc?

as much readable information as possible please.
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Re: Slow transfer speeds on gigabit network

Postby solo9999 » Mon Nov 20, 2017 4:14 am

Similar issue here with a DS214play hardwired to router hardwired to ShieldTV. Using NFS. I can't get videos to play smoothly due to slow network speeds. I tried resetting everything to factory, redid all settings etc. Same issue. Router is RT-AC5300. I just ordered a DS718+ to test if the issue is with the DS214play. I also have another router coming for testing. If it turns out to be the Synology I might just ditch it and get a NUC. All I need is a 500GB networked HDD which holds my MKVs and serves to the ShieldTVs for transcoding! Maybe the NUC will do better with that.
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Re: Slow transfer speeds on gigabit network

Postby Hardcore » Mon Nov 20, 2017 11:02 pm

Getting sick and tired of sinology

bought a 1817+ and the transfer rate is garbage.
Had an old 1511+ and would regularly see 80-100Mb/s with a bonded link directly into the back of the computer and the samba system.

now the 1817+ starts off a big transfer at 40-50mb/s and ends up at a steady 5mb/s
the only change was to swap the cables from one device to the other...oh and to pay out a [Please control your language] load of money.

this is just garbage, why can it start out at half the speed of the 1817+ but then decline to nothing.
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Re: Slow transfer speeds on gigabit network

Postby synoml » Fri Dec 01, 2017 5:22 pm

cdht wrote:Ever since I upgraded​ to DSM 6, SMB transfer speeds on my Gigabit network have been 20MB/s to my DS213+ and 30MB/s from it. I tried everything from setting the minimum SMB to SMB2 and disabling transfer logging. I left that logging on, but when I uninstalled Universal Search as root, it has jumped to 105MB/s from and 70MB/s to it. It was uninstalled by SSH as admin, elevation to root with sudo -s, and uninstalling with synopkg uninstall SynoFinder. I hope this helps someone.



I can confirm this also solved my problem... Transfer speeds on SMB are so much higher now and no more 'hanging' while I want to just enter a f*cking directory on a share, which previously could take up to 20 seconds...
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Re: Slow transfer speeds on gigabit network

Postby tseward » Mon Dec 04, 2017 2:24 am

Despite removing Universal Search, I'm still seeing a maximum of ~35MB/s transfer rate for single large files from a 412+ with WD Reds. Prior to DSM 6.x, I was seeing ~100MB/s. A local dd shows that I can get >100MB/s. It's just smbd (and nginx if downloading through the web UI) that limit my speed to 35MB/s.
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Re: Slow transfer speeds on gigabit network

Postby laminam » Mon Dec 04, 2017 6:35 am

tseward wrote:Despite removing Universal Search, I'm still seeing a maximum of ~35MB/s transfer rate for single large files from a 412+ with WD Reds. Prior to DSM 6.x, I was seeing ~100MB/s. A local dd shows that I can get >100MB/s. It's just smbd (and nginx if downloading through the web UI) that limit my speed to 35MB/s.



Same problem here after upgrading to DSM 6.x. local speeds are fine (200/MB+), smb and nfs traffic max out around 35MB/s after the update. DS1513+
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Re: Slow transfer speeds on gigabit network

Postby tseward » Wed Dec 06, 2017 4:00 am

Ultimately what I've gotten back from Synology support is "reinstall". Not really helpful.
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Re: Slow transfer speeds on gigabit network

Postby Dave0401 » Thu Dec 07, 2017 10:13 am

Same problem on my DS214+!

NAS: Synology DS214+ with DX213
HDD: 4x WD RED
DSM: Version 6.1.4-15217-2
LAG connection to network. (2000 Mbit/s)

Before upgrade to latest DSM Version i have excellent transfer speeds. READ or WRITE speed was 100+ MB/s.
Now? READ max 6,5 MB/s and WRITE 70-80MB/s!
Synology DS214+ & Synology DX213
HDD: WD RED Series
Czech Republic

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