Hi
This is primarily for ATLAS site but as it may indirectly effect
other sites I have included TB-support. We have recently had some
backlog of files for transfer to and from UK sites. With some sites
significantly increasing their disk space and CPU recently we thought
it was good to review the channel settings.
For transfer from RAL -> Tier 2s, the load depends roughly on disk
space deployed. We therefore came up with the following rule of
thumb to assign channels:
1) 1 File transfer per 25TB of disk space deployed
2) Minimum number of channels should be 4.
For transfers from Tier 2s -> RAL, the load depends roughly on the
number of job slots. We therefore came up with a different rule of
thumb to assign channels:
1) For sites with 0 - 500 job slots hey will be permitted 10 file
transfers.
2) Increase by 5 for every additional 500 job slots.
I have posted the new channel below, if anyone has any suggestions,
questions, corrections or concerns please feel free to raise them.
These changes will be probably made on Monday, it will still be
possible to tweak channels on request.
Alastair + Brian
The new changes are:
Channel name, current FTS, new FTS
RALLCG2-UKILT2BRUNEL (2/2) 4
RALLCG2-UKILT2ICHEP (2/2) 4
RALLCG2-UKILT2QMUL (6/6) 10
RALLCG2-UKILT2RHUL (6/6) 11*
RALLCG2-UKILT2UCLHEP (4/4) 4
RALLCG2-UKINORTHGRIDLANCSHEP (8/8) 13
RALLCG2-UKINORTHGRIDLIVHEP (4/4) 8
RALLCG2-UKINORTHGRIDMANHEP (4/4) 8
RALLCG2-UKINORTHGRIDSHEFHEP (4/4) 8
RALLCG2-UKISCOTGRIDDURHAM (2/2) 4
RALLCG2-UKISCOTGRIDECDF (4/4) 4
RALLCG2-UKISCOTGRIDGLASGOW (20/20) 20**
RALLCG2-UKISOUTHGRIDBHAMHEP (4/4) 8
RALLCG2-UKISOUTHGRIDCAMHEP (4/4) 4
RALLCG2-UKISOUTHGRIDOXHEP (4/4) 6
RALLCG2-UKISOUTHGRIDRALPP (4/4) 8
Site name, number of CPUs, Current FTS new FTS
FTS UKI-SCOTGRID-GLASGOW 1900 25 25
UKI-NORTHGRID-MAN-HEP 1600 15 25
UKI-SOUTHGRID-RALPP 900 10 15
UKI-SCOTGRID-ECDF 900 10 15
UKI-NORTHGRID-LIV-HEP 700 10 15
UKI-LT2-IC-HEP 600 20 15
UKI-NORTHGRID-LANCS-HEP 500 10 15
UKI-SCOTGRID-DURHAM 350 5 10
UKI-LT2-RHUL 350 10 10
UKI-SOUTHGRID-OX-HEP 300 5 10
UKI-SOUTHGRID-BHAM-HEP 300 10 10
UKI-SOUTHGRID-CAM-HEP 250 5 10
UKI-NORTHGRID-SHEF-HEP 200 10 10
UKI-LT2-QMUL 110 10 10
UKI-LT2-UCL-HEP 100 10 10
Total 9060 165 205
* Due to RHUL having limited network capacity currently this will be
monitored carefully and possibly reduced to 8 or 10
** With the current rule glasgow should only have 16 channels but it
has been running happily with 20 for a while so we won't reduce it.
If these changes work smoothly we can consider increasing the allow
channels of all sites in line with glasgow, (ie upto 1 file transfer
per 20TB deployed disk space).
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