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Forum Discussion
VERY slow transfer from NV+ to Ultra 4
Afternoon lads,
I've trawled through the forums and gone slightly blind looking for solutions to this, so please forgive me if I've managed to miss the simple and obvious solution :)
I am trying to do a copy (tried backup job, rsync and scp so far) of approx 900GB of data consisting of numerous large video files from my NV+ to my friend's Ultra 4. For some reason I can only get a max of 1.5MB transfer between the two boxes and figuring it out is driving me demented.. I've been through the forums and the performance guide but to no avail. Here follows the details of my setup and tests.
Network setup: [NV+] -> [Gigabit Cable] -> [Cisco E4200 gigabit router] <- [Gigabit Cable] <- [Ultra 4] (both boxes are on the same 192.168.1.* subnet)
NV+: Default configuration for CPU and RAM, with 1x1.5TB WD Caviar drive, and 2x2TB Hitachi drives, RAIDiator 4.1.8
Ultra 4: Default configuration for CPU and RAM, with 2x2TB Samsung drives, RAIDiator 4.2.19
Both boxes are using default xRAID configuration.
I have disabled journalling on both boxes, enabled jumbo frames, and killed any and all unnecessary services.
Tests:
A 1.5GB video file was used in all of these tests, along with a MacBook Pro 5,5 running Ubuntu 11.04.
The MacBook was connected to the router like so: [Laptop] -> [Gigabit Cable] -> [Cisco E4200 gigabit router] <- [Gigabit Cable] <- [NAS XXX], and the file was drag/dropped to the network share.
- Read from NV+: 10.4 MB/sec
- Write to NV+: 6.7 MB/sec
- Read from Ultra4: 42 MB/sec
- Write to Ultra4: 17.5 MB/sec
These figures look roughly what I would expect from reading other people's performance notes, etc.. so as far as I can tell both machines and the network overall seem to be performing as expected. The problem is that when I connect both boxes back to the router, login to the Ultra4 of them over SSH and do an scp of the test file from above from the remote [NV+] to the local [Ultra4].
The result of this test is a fairly steady copy rate of 1.5MB/sec.
Using rsync (also on the command line) with various options gets the rate to vary from 900 KB/sec to about 1.6MB/sec.
The only things that I came across that might cause some issues are:
- In the downloaded logs from the Ultra4 there is a note stating that interface 2 does not ahve jumbo frames enabled. Probably doesn't matter as I'm using interface 1.
- The router seems to only support MTUs up to 1500.
Any and all help would be appreciated on this becasue I'm completely stumped. As mentioned I have the Ultra 4 logs available if needed.
Thanks!
I've trawled through the forums and gone slightly blind looking for solutions to this, so please forgive me if I've managed to miss the simple and obvious solution :)
I am trying to do a copy (tried backup job, rsync and scp so far) of approx 900GB of data consisting of numerous large video files from my NV+ to my friend's Ultra 4. For some reason I can only get a max of 1.5MB transfer between the two boxes and figuring it out is driving me demented.. I've been through the forums and the performance guide but to no avail. Here follows the details of my setup and tests.
Network setup: [NV+] -> [Gigabit Cable] -> [Cisco E4200 gigabit router] <- [Gigabit Cable] <- [Ultra 4] (both boxes are on the same 192.168.1.* subnet)
NV+: Default configuration for CPU and RAM, with 1x1.5TB WD Caviar drive, and 2x2TB Hitachi drives, RAIDiator 4.1.8
Ultra 4: Default configuration for CPU and RAM, with 2x2TB Samsung drives, RAIDiator 4.2.19
Both boxes are using default xRAID configuration.
I have disabled journalling on both boxes, enabled jumbo frames, and killed any and all unnecessary services.
Tests:
A 1.5GB video file was used in all of these tests, along with a MacBook Pro 5,5 running Ubuntu 11.04.
The MacBook was connected to the router like so: [Laptop] -> [Gigabit Cable] -> [Cisco E4200 gigabit router] <- [Gigabit Cable] <- [NAS XXX], and the file was drag/dropped to the network share.
- Read from NV+: 10.4 MB/sec
- Write to NV+: 6.7 MB/sec
- Read from Ultra4: 42 MB/sec
- Write to Ultra4: 17.5 MB/sec
These figures look roughly what I would expect from reading other people's performance notes, etc.. so as far as I can tell both machines and the network overall seem to be performing as expected. The problem is that when I connect both boxes back to the router, login to the Ultra4 of them over SSH and do an scp of the test file from above from the remote [NV+] to the local [Ultra4].
The result of this test is a fairly steady copy rate of 1.5MB/sec.
Using rsync (also on the command line) with various options gets the rate to vary from 900 KB/sec to about 1.6MB/sec.
The only things that I came across that might cause some issues are:
- In the downloaded logs from the Ultra4 there is a note stating that interface 2 does not ahve jumbo frames enabled. Probably doesn't matter as I'm using interface 1.
- The router seems to only support MTUs up to 1500.
Any and all help would be appreciated on this becasue I'm completely stumped. As mentioned I have the Ultra 4 logs available if needed.
Thanks!
13 Replies
Replies have been turned off for this discussion
- Thanks for the suggestion, but I don't think thats the actual problem for 2 reasons: 1, its Mac hardware but I run Ubuntu on it, and 2, the slowdown happens when the Mac is out of the loop going directly from NAS-NAS, and AFP is off...
This thing is immensly frustrating. It defies all logic that adding an item to the chain will make it faster.. :) - Last comment.
Can you isolate the router ? Do you have a spare GB switch?
If so, connect everything to the switch including the router. Then the data path will bypass the router. - I'd suggest you go back to basics, doing a series of tests so you can narrow down the cause of the issue - your initial performance numbers do NOT seem appropriate and you should try to ensure that is first resolved before moving on
First, I'd strongly recommend you work with OSX on your MacBook for the time being - who knows what issues there may be with Ubuntu and network drivers on a MacBook
Second, test performance over a direct connection between your macbook and each of your 2 NAS to establish a baseline - your NAS to NAS speed is unlikely to be faster than the slowest speed you see via a direct connection.
Third introduce your router and again test performance between Mac and each NAS to see if there is any substantial degradation. Ideally you should see the same level of performance as when you implement a direct connect.
Once you are happy that you have everything setup and performing as it should in the standard config, then retry NAS to NAS communication and finally return to linux on your macbook and compare to your OSX based results.
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