Atlas:CCRC08May
Sommaire
T0-T1 transfer tests (week1)
T1-T1 transfer tests (week2)
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
