Hi
Changes have been rolled out. Brian and myself will be monitoring
things but if you notice a problem don't hesitate to contact us.
Assuming there are no problems we will probably review these settings
quarterly.
Alastair
On 15 Oct 2010, at 14:33, Alastair Dewhurst wrote:
> 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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