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PaoloTedesco
2007-07-20

FTS Channel Resolution

This page describes how the FTS assigns channels to a job.

This description applies both to FTS 1.5 and FTS 2.0; the only difference is that starting from FTS 2.0, a site can belong to one or more groups, and it's possible to define channels using group names. The groups-related part of this algorithm does not apply to FTS 1.5.

Notation

A : site A (source)

B : site B (destination)

[A] : group containing A

[B] : group containing B

* : catch all

Resolution

For a transfer job from site A to site B, FTS will search the defined channels and assign the first found following this order:

Source Destination Description
A B Dedicated channel from site A to site B
[A] B Channel from a group including site A to site B
A [B] Channel from site A to a group including site B
[A] [B] Channel from a group including site A to a group including site B
* B Catch-all to site B
A * Site A to catch-all
* [B] Catch-all to a group including site B
[A] * Group including site A to catch-all
* * Catch-all to catch-all

FTS tries to find the best (less generic) possible match on the destination, since write operations scale worse than read operations.

-- PaoloTedesco - 20 Jul 2007

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