-- JamieShiers - 07 Mar 2006

Status of Pre-Production System

Feedback from experiments on required services


For the pre-production services (PPS):

- LFC catalog required at all pre-production Tier1s

- FTS server at all pre-production Tier1s and at the pre-production Tier0 - FTS channels between all pre-production Tier1s. FTS channels to/from a pre-production Tier1 to all its associated pre-production Tier2s. CERN should have FTS channels defined to all pre-production Tier1s.

- (there is an "SRM" column on the excel sheet with the list of services: I guess this is required by default right?)

[ for more details, please check ATLAS SC4 plans during Mumbai workshop ]

For the production services (PS): - exactly the same components as for PPS - BUT we do not need the new FTS Tier1 servers/channels for Production before June (SC4 start). We just need what we have today (FTS server at Tier0 with channels to all Tier1s). What we also have today - local LFC production catalogs at Tier0 and Tier1s and VO BOXes at Tier0 and Tier1s - is all we need up until SC4 start. (no new FTS requirements for the production service until SC4 start/June)

> An important point on VO BOXes < ATLAS requires VO BOXes at Tier0 and Tier1s only. BUT we do not require sites to deploy a separate VO BOX for the production or pre-production, as our code can easily coexist in the same box and is not CPU/disk intensive. So, for ATLAS, sites may claim the VO BOX PPS and VO BOX PS to be the same machine with the same endpoint. If sites or LCG decide to deploy two instance that's fine of course but there's no real gain in doing so. * The catch here is updating gLite FTS client libraries - there may conflicts between multiple versions! * The two separate instances of our code can point to either PPS or PS.

Metrics for experiment testing of PPS


- Pre-production service will be used as soon as it is available and its usage won't go away when SC4 starts. There may be periods where the pre-production service is not extensively used, but the goal is from now on to always develop against the pre-production service.

- The first usage of the PPS will be for an intense Tier0 export test on March/April (one week). LCG&sites are free to propose the most convenient week. The goal is for all intervenient sites to accomplish their MoU rates. This exercise would ideally run on the production service but the goal is to exercise data management using new m/w (and we expect to have faster upgrade cycles in case of problems, by using the PPS). We expect data to be stored on tape during this exercise, but may be scratched (along with all catalog/disk entries) at a later date - to be discussed with sites. This will be very much an exercise on the Tier1 storage elements! More details on this exercise will be sent out soon but again, please take a look at our Mumbai presentation for rates, etc - Before SC4 starts, the PPS will also be used for a distributed production exercise, to test the integration of data management and workload management.

Review of Experiment Plans and Site Setup

Status of Background dTeam Transfers





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Topic revision: r1 - 2006-03-07 - JamieShiers
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