Copy to Network Storage (NAS) Speed

[tjsuominen]

Hi,

There has been some discussion about the copy speed to network storage and various factors that *might* impact into that. I have found some interesting performance behavior now with TC 8.01 (x64) under Windows 7 (SP1).

In TC options > Copy/Delete > I have set the "Allow use big file copy mode (not using cache)" with the default values

- Source + Target on same disk: 10240 k
- Source + Target on different disks: 64 k

Now, when I start copying a big file (say 6 Gig) from local W7 machine to Buffalo Linkstation NAS, at 1st the copy speed increases and varies between 30000 - 60000 kB/sec, but after say ~30% completion, it drops to 5000-6000 kB / sec and does not increase anymore.

Is that a bug in TC, could something be done with the TC configuration options or something else?

//timo

[HolgerK]

Caching effect if you copy from fast medium to slow medium.

Btw. you will get the best speed and compatibility if you check:
[x] use compatibility mode for the following drives

Code: Select all

/

or:
[x] Use standard copy method (recommended)

Regards
Holger

[tjsuominen]

Hi,

Btw. you will get the best speed and compatibility if you check:
[x] use compatibility mode for the following drives

Set compatibility mode for the target (= NAS) drive I guess?

or: [x] Use standard copy method (recommended)

By having this option on, I can not get more than 5000-6000 kB transfer speeds.

//timo

[HolgerK]

Set compatibility mode for the target (= NAS) drive I guess?

Yes.
Either a list of drive letters or / for all network devices (please read the help for further explanations).

By having this option on, I can not get more than 5000-6000 kB transfer speeds.

I suppose your NAS or network connection (WiFi?) does not allow higher rates.

Regards
Holger

[tjsuominen]

Hi,

Configured TC -> Set compatibility mode for the target with "/" for the network (NAS) drive (yes, over Wifi).

For the 1st ~20% the copy speed was great, hitting almost 65000 kbytes/s, but then dropped to 6500 kbytes/s...

So not yet working on optimal level.

//timo

[HolgerK]

yes, over Wifi

What are you expecting from Wifi?
E.g 54Mbits/s (real world 25-30Mbits/s)
divided by 8
=> 6.75MBytes/s (real world 3.15- 3.75MByte/s)
And these are maximum rates which may be much lower if your have multiple networks in your neighborhood, traffic from other clients on your network or a bad connection between clients.

Regards
Holger

[tjsuominen]

Thx HolgerK,

Yes I got your points and yes that's perhaps the "WiFi" case. Just to elaborate, my laptop is connected via WLAN to my ZyXel DSL/WLAN modem, which is wired (CAT6) to a Netgear Gigabit Switch to which the NAS is wired (CAT6).

So is this behaviour (= 1st speed is up-to 60000 kB / sec but then say after ~20-30% drops to 5-6000 kB/ sec) due to Windows / my network set-up and has nothing to do with TC?

Just trying to understand

Thx a lot!

//timo

[HolgerK]

I guess the first unrealistic speed (60MB/s) comes from the fast filling of a windows write buffer (which is not controlled by TC).
You may control it with task mangers physical memory history which should increase while the write buffer is filled.

Regards
Holger

[tjsuominen]

Hi.

So is there a way (in Windows) to to adjust this 'unrealistic speed' somehow? I have nothing against the copy have speed of 60 MB/s for more than during the 1GB...

BR,
Timo

[tjsuominen]

Hi,

Would like to still raise this up ;) Updated to 64-bit Windows 8.1 and TC 8.51a (64-bit).

Any further tips / tricks to try (in TC or Windows or Windows network settings?

Thx!

//timo

[NoSubstitute]

This is completely unrelated to TC.

I just copied some unencrypted files over my network at over 100 MB/s.
That's from my Buffalo Linkstation NAS with Gbit wired network from it to my laptop, with the destination being my superfast 500 GB Samsung 840 Pro SSD.

From my other NAS, an Xtreamer eTrayz, I can't get more than 10 MB/s, despite the fact that it has a GBit nic. There the problem is it runs over Samba/SMB/CIFS which is too heavy for its weak cpu. Over NFS I can get 20 MB/s from it to my Linux server. From my PC-built Linux mediaserver I get between 30-60 MB/s, depending on how fast the harddisk in the system is (they are also all fully encrypted). It too, of course, has a Gbit nic.

Over wifi I have never gotten more than 5 MB/s, no matter how fast Windows says the connection currently is.

[tjsuominen]

Thx @NoSubstitute for your post, I rest my case (with WiFi connection) and just be happy about the performance I get :)

Thx!

//timo