Slow transfer speeds on gigabit network

[WAM69]

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.

[lburns]

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]

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]

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]

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.

[lburns]

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.

[solo9999]

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.

[Hardcore]

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.

[synoml]

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...

[tseward]

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.

[laminam]

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+

[tseward]

Ultimately what I've gotten back from Synology support is "reinstall". Not really helpful.

[Dave0401]

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!

[mariole1]

Hi there,

I had the same issue using my Linux PC to transfer files over SMB.
Here is the configuration who made the difference:

On the Nas (ds415+, version: DSM 6.1.4-15217 Update 5) side:



On the Linux host side:

Code: Select all

dpkg -l cifs-utils
cifs-utils                  2:6.7-1
#cat /etc/fstab
//my-nas/films    /data/films     cifs    defaults,credentials=/etc/samba/.credentials,vers=2.0,uid=1000   0       0

Apparently enforcing the vers=2.0 changed the game, I was then able to transfer the files with Gbit connection between the 2 nodes.

Code: Select all

man mount.cifs
...
 vers=
           SMB protocol version. Allowed values are:

           ·   1.0 - The classic CIFS/SMBv1 protocol. This is the default.

           ·   2.0 - The SMBv2.002 protocol. This was initially introduced in Windows Vista Service Pack 1, and Windows Server
               2008. Note that the initial release version of Windows Vista spoke a slightly different dialect (2.000) that is not
               supported.

           ·   2.1 - The SMBv2.1 protocol that was introduced in Microsoft Windows 7 and Windows Server 2008R2.

           ·   3.0 - The SMBv3.0 protocol that was introduced in Microsoft Windows 8 and Windows Server 2012.

           Note too that while this option governs the protocol version used, not all features of each version are available.

Hope this help other

Cheers
--
Eric

[roguerpi]

Bumping a long running thread!

Longtime Synology user, now on my third device. A big one: DS1517+

5x WD Red 4TB drives, SSD Cache controller, 2x 120GB SSD chips for cache

Speeds: meh to terrible. Very similar to what is reported here. RAID 5, ext 4, all setup completed, everything showing as "healthy" but the Volume utilization in Resource Monitor would go to 100% during a transfer and stay there. Speeds over the network (gigabit, all wired, very short distance, all nice fresh cables) would be terrible. Maybe start off at 50MB/s and then drop to near 0 for a few seconds, before struggling along.

Per some troubleshooting posts in this thread, I just disabled the SSD cache.

110 MB/s read or write, smooth like butter.

This is used for mostly large files, 300 MB to 5 GB. Not a lot of tiny stuff. Not a lot of users. Any combination of files would cause it to choke on read OR write. This seems like an issue with how the SSD cache is utilized.