Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
Slow transfer rate.
dcwill
Member
02-26-2008 10:09 PM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
I have seen this problem in several forum posts but all involved slow transfer rates over a network. I have this problem and also when copying files from the embedded controller to a firewire drive.
Over a 1Gbit network connection I am getting only a 2MB/s rate. This is using several methods, an FTP client, Internet explorer or MAX. All give the same rate, 2MB/s
I have also tried transfering a file from the embedded controller to a firewire drive and was only able to get a rae of 4MB/s. Whil transfering the data file from the Firewire drive to a PC completes in reasonable time. So it seems to me that the problem is not network related or not just a network problem.
I will be collecting data with a PXI system running Labview RT 8.21. With the amount of data over 20 GB . And I don't want to have to wait hours for the transfer to complete.
How can the transfers be so slow. The common item seems to be accessing the hard drive.
Dave
Over a 1Gbit network connection I am getting only a 2MB/s rate. This is using several methods, an FTP client, Internet explorer or MAX. All give the same rate, 2MB/s
I have also tried transfering a file from the embedded controller to a firewire drive and was only able to get a rae of 4MB/s. Whil transfering the data file from the Firewire drive to a PC completes in reasonable time. So it seems to me that the problem is not network related or not just a network problem.
I will be collecting data with a PXI system running Labview RT 8.21. With the amount of data over 20 GB . And I don't want to have to wait hours for the transfer to complete.
How can the transfers be so slow. The common item seems to be accessing the hard drive.
Dave
Jennifer_R
NI Employee (retired)
02-28-2008 02:22 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Hi Dave,
Would you be able to provide more information about your system? Which controller are you using?
Jennifer R.
National Instruments
Applications Engineer
National Instruments
Applications Engineer
02-28-2008 11:18 AM
Options
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report to a Moderator
Thank you for replying.
This is a my second NI PXI system, the first system also had a slow transfer rate. But the rate is a bigger problem with this second system because there is a lot more data to transfer, about 20+ GBytes. Right now I am in the process of transferring 10 files of about 10 GB. I started the transfer and went to lunch, it should take a couple of hours.
chassis : PXI-1056
controller : 8196
connection : PXI - PC via crossover cable.
LAN speed : Gbit
OS : Labview RT to Windows XP
Transfer program : Filezilla, (other methods produce the same result)
I have transfered similar size files from PC-PC and obtained a rate of about 33MB/sec vs 2-3MB/sec
In previous forum posts there was mention of setting the transfer mode to full duplex. On the PXI side, using MAX there is a drop down list to switch to Gbit full duplex, but these options aren't enabled. The only choice available is auto detect.
On the PC I set the transfer mode to Gbit full duplex. The change made no diffference.
Dave
