copying speed NAS to NAS

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copying speed NAS to NAS

Without details, I have big and strange problem.
On 1Gb local network, I have ~100 MB/s speed when trasfer files:
  • PC (win)<>NAS1/2 (smb/cifs) - network places
  • NAS1<>NAS2 via web browser (http)
Great! And that show that network,switch,cables,smb... are OK
But (which I use a lot, every day, and is most convinient for me) transfer
NAS1<>NAS2 via windows explorer, network places (smb/cifs again, ws discovery) - speed is ~3 MB/s !!
I tried lots of things including using mount shares (NAS1 in NAS2), mapping drives in win..., but no luck.
(NAS1/2,PC are lan connected to switch and I tried direct connect to router ; smb min 2)
Anyone have an idea what I am missing?
 
PC is wired (lan into switch)
Ookla very good (irrelevant)
Network settings seems good cos I dont have issues in any other scenario.
Antivirus real-time protection off.

Win7 smb signing: in group policy all 4 Digitally sign communications are disabled.
Is there any other way to check is smb signing/encryption tutned off in win7?
I don't think that any other protocol than smb when using 'win explorer network places' is possible. As I said that protocol work fine when tranfering PC<>NAS1/2 and also transfer between NASes via Http in browser works fine.
 
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coop: That's exactly what confusing me: CIFS share transfer is fastest, but do you think that that 'bypass the PC entirely'? I still have to open browser in Win. Anyway, that is not solution, cos for everyday use I want/need explorer (XYZ).
eaz: yes! Speed is listed in win when coping. Also, AJA speed test gives same results for NAS folders maped in win.
 
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When transferring via remote mounted CIFS shares, you are transferring data from NAS to NAS directly, not through the PC itself. Using the PC to access DSM to execute the NAS to NAS file transfer is optimal.
 
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Last edited:
So the problem seems to be when using a PC to copy files from a NAS 1 mounted SMB network share to similar on NAS 2.

I just tested this with my Mac connected, copying a folder of photos from one NAS to another via the Mac. My network monitor is showing the NAS 2 LAN port receiving at between 300 and 600 Mbps, and this matches transmit speeds on the Mac. They also match the NAS 1 transmit and Mac receive speeds. Hopefully this demonstrates that it is possible to achieve higher than a few MB/s. So what's different with the SMB connectivity on your NAS and PC?
 
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Yes, fredbert (thanks for your time), that's what I expect. But, if the problem is in the smb connection (on PC smb1/2/3? and NAS min2), cables, switch... then transfer PC><NAS would be also slow, which it isn't. So strange, I haven't found anyone with that problem.
Also, the same slow transfer is when I use win explorer for NAS1<>NAS2 no matter if:
  • original windows explorer network
  • mapped drives (shared folders)
  • NAS2 shared folder cifs mounted onto NAS1 (through windows explorer network)
Fast transfer:
  • NAS2 shared folder cifs mounted onto NAS1 (through windows browser - http protocol)
  • PC><NAS1/2 (through windows explorer network - smb protocol)
Difference in speed is 30x!
 
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So the only situation where it is slow is when the PC is mounted to both NAS, using SMB, and the PC copies data from NAS 1 to NAS 2. That sounds like it could be networking or SMB on the PC where it is simultaneously receiving data from NAS 1 and transmitting to NAS 2. But replacing SMB with HTTP connections then there is no slow down, so that would suggest networking isn't likely to be the issue.

Are the HTTP connections:
  • WebDAV mounts in Windows Explorer, like doing SMB mounts, or
  • DSM browser windows to both NAS, and you are doing a drag and drop between windows.
  • Some other way that you might tell us?
 
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Last edited:
fredberz
http protocol is used when I'm working in browser (resource monitor/connected users show http/https)
and NAS2 remote folder is mounted (CIFS shared folder) in NAS1.
So, do you think that than http AND smb is used. Transfer is fast.
I don't know how to mount anything in Explorer. (maybe iso file is 'mounted' as virtual drive through PowerISO).
I just use 'network' in Explorer. And also tried 'mapped drives', but with same slow results.
I dont know if it's possible to WebDAV mount NAS (or cifs mount) in Explorer. If it is, maybe it can be workaround.
 
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http protocol is used when I'm working in browser (resource monitor/connected users show http/https)
and NAS2 remote folder is mounted (CIFS shared folder) in NAS1.
So, do you think that than http AND smb is used. Transfer is fast.
So this sounds like the copy is direct from one NAS to the other. You are connecting to the NAS's DSM web interface (on NAS 1?) and telling that NAS to copy files to or from the other NAS, via their mounted CIFS/SMB connection. The PC does not handle any data transfer.

I don't know how to mount anything in Explorer. (maybe iso file is 'mounted' as virtual drive through PowerISO).
I just use 'network' in Explorer. And also tried 'mapped drives', but with same slow results.
I dont know if it's possible to WebDAV mount NAS (or cifs mount) in Explorer. If it is, maybe it can be workaround.
WebDAV service, if enabled in the two NAS, can be used to mount shares in Windows Explorer: you can search the web to find out how to do this. But this method would be similar to you mounting CIFS/SMB network shares in Windows Explorer: the PC does act in the data transfer.
 
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fredbert
Thanks, I learned something. I succed to WebDAV mapped both NASes as drives in Explorer.
I even disabled SMB in NASes to be sure that smb is not used. Unfortunatly, as you predicted, results are same as before.
But I discovered something new (checked multiple times):
I do get fast (same as in browser for copy/move) tranfer in Explorer in only 1 scenario:
moving (not copying) files between NAS1 and NAS2 cifs mounted in NAS1. NAS1 can be cifs or webdav mapped/mounted in Explorer or Explorer/Network (cifs) can be used: moving is always fast.
(when I use two different NASes (not 1 mounted on other) moving is always slow).
Copying is slow in every scenario.
Does it mean something?
My goal is to fast COPYING files between 2 NASes in Windows Explorer!
 
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I do get fast (same as in browser for copy/move) tranfer in Explorer in only 1 scenario:
moving (not copying) files between NAS1 and NAS2 cifs mounted in NAS1. NAS1 can be cifs or webdav mapped/mounted in Explorer or Explorer/Network (cifs) can be used: moving is always fast.
(when I use two different NASes (not 1 mounted on other) moving is always slow).
Copying is slow in every scenario.
Does it mean something?
I don't know. There would seem to be a difference in how moves and copies are implemented.
 
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Without details, I have big and strange problem.
On 1Gb local network, I have ~100 MB/s speed when trasfer files:
  • PC (win)<>NAS1/2 (smb/cifs) - network places
  • NAS1<>NAS2 via web browser (http)
Great! And that show that network,switch,cables,smb... are OK
But (which I use a lot, every day, and is most convinient for me) transfer
NAS1<>NAS2 via windows explorer, network places (smb/cifs again, ws discovery) - speed is ~3 MB/s !!
I tried lots of things including using mount shares (NAS1 in NAS2), mapping drives in win..., but no luck.
(NAS1/2,PC are lan connected to switch and I tried direct connect to router ; smb min 2)
Anyone have an idea what I am missing?
I know you insist on using Windows explorer but only for test can you try same operations with Total commander?
 
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