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Overview Publications Software

LoRS FAQ

LoCI FAQ (Frequently Asked Questions)



Category: Main -> LoRS FAQ

Question
·  What are the download algorithms employed by LoRS? How does LoRS choose the depots closest to a certain destination?
·  I have installed the LoRS tools from source. What is the lors_setup.sh program?
·  Does LoRS support resuming on transfers?
·  Is there a command line tutorial for the LoRS tools?
·  How do I use MCopy in lors_augment?
·  What is LoRS View?
·  How do I install the Windows package?
·  I'm having problems downloading an ISO file. What should I do?

Answer
·  What are the download algorithms employed by LoRS? How does LoRS choose the depots closest to a certain destination?

LoRS has two methods available for using the highest bandwidth depot for downloads. One is explicit, as defined by the resolution file, the second is adaptive, as defined by the progressive-redundancy download algorithm.

To make use of the explicit downloading, you must have an accurate resolution file that reflects the topology of the depots in the LBone available to your client machine. Currently LoRS does not have a means of calculating network topology dynamically. The current resolution file contains geographic distance information, which is often a poor substitute for network topology.

The adaptive download algorithm prefers depots that respond quickly over those that take a relatively longer time to respond. In the adaptive case there is no a priori knowledge of the relative speed of the depots to your client unless an accurate resolution file is used.

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·  I have installed the LoRS tools from source. What is the lors_setup.sh program?

The shell script lors_setup.sh is designed to setup the LoRS tools preferences file named ".xndrc". It is written to the user's home directory and records the user's primary location as well as other application defaults.

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·  Does LoRS support resuming on transfers?

LoRS download supports resume with release 0.82.

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·  Is there a command line tutorial for the LoRS tools?

Yes, follow this link.

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·  How do I use MCopy in lors_augment?

MCopy in lors_augment creates a tree using route_depots (R) and target_depots (T)

If you do not have a mono-spaced font, this diagram will appear distorted:

/----->T1
source -->R------>T2
----->T3


Without specifying the route depots in the .xndrc file, it uses the programmed defaults, which are in Tennessee. The flexibility of the command line tool for more complicated routing schemes is clearly limited. For more complex scenarios, use the LoRS API.

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·  What is LoRS View?

LoRS View is the TCL/Tk GUI used for easier tool control and visual feedback of transfers. The best feature of LoRS View is the geographic view of the L-Bone. During the different upload, augment or download operations, you may watch the discrete transfers as they occur.

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·  How do I install the Windows package?

Go to this page.

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·  I'm having problems downloading an ISO file. What should I do?

If you are experiencing difficulty downloading a Linux ISO on any platform, it may be due to the decay of the exNode. Because IBP is not static storage, it expires over time and must be moved or refreshed to preserve file integrity. Despite our best efforts, it is still possible from time to time to have the ISOs exNode decay to a point of uselessness.

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