Atlas:CCRC08May

T0-T1-T2 transfer tests (week3)

General remarks

https://twiki.cern.ch/twiki/bin/view/Atlas/DDMOperationsGroup#CCRC08_2_May_2008

The T0 load generator will run at "peak" rate for 3 days ("peak" rate means data from 24h/day of detector data taking at 200Hz are distributed in 24h, while "nominal" rate means data from 14 hours/day of detector data taking at 200Hz are distributed in 24h).

At peak rate 17,280,000 events/day are produced, corresponding to 27.6 TB/day of RAW, 17.3 TB/day of ESD and 3.5 TB/day of AOD (considering the sizes of 1.6 MB/event for RAW, 1.0 MB/event for ESD and 0.2 MB/event for AOD)

T0-T1(LYON)

Shipping continuously data to T1s according to computing model, sites should demonstrate to sustain for 3 days the following export rates

SITE	TAPE	DISK	TOTAL
IN2P3	48.00 MB/s	100.00 MB/s	148.00 MB/s

Metric for success: Sites should be capable of sustaining 90% of the mentioned rates (for both disk and tape) for at least 2 days of test. For sites who would like to test higher throughput, we can oversubscribe (both to disk and tape).

As a reminder, here the table of the necessary space needed at each T1

SITE	TAPE	DISK
IN2P3	12.4416 TB	25.92 TB

Logbook

• Transfers started at about 13h30.

The overall throughput from T0 is over 1000MB/s. Lyon is receiving its share at 100-200 MB/s (verying with time). the average rate is about 40MB/s to IN2P3-CC_DATADISK and 140MB/s to IN2P3-CC_DATATAPE according to dashb http://dashb-atlas-data-tier0.cern.ch/dashboard/request.py/site?name=LYON.

T1-T2

T2s will receive AODs, which should be generated at a rate of 3.5TB/day. The amount that each site receives depends on the share

• IN2P3-LAPP_DATADISK : 12%
• IN2P3-CPPM_DATADISK : 5%
• IN2P3-LPSC_DATADISK : 5 %
• IN2P3-LPC_DATADISK : 13%
• GRIF-LAL_DATADISK : 30%
• GRIF-LPNHE_DATADISK : 15%
• GRIF-SACLAY_DATADISK : 20 %
• BEIJING-LCG2_DATADISK : 20 %
• RO-07-NIPNE_DATADISK : 10%
• RO-02-NIPNE_DATADISK : 10%
• TOKYO-LCG2_DATADISK : 50%

as written in https://twiki.cern.ch/twiki/bin/view/Atlas/DDMOperationsGroup#CCRC08_2_May_2008

The shares are decided rather arbitrary according to the free space in ATLASDATADISK. These numers can be raised at a later stage of the test, but at first we would like to be sure everythinig goes well with this rate.

• Transfers started at about 15h10.

http://lcg2.in2p3.fr/wiki/images/20080521-1530-LYONT2.throughput.14400.png