# Presentation: 324674

## SAM Status

- Lee Lueking
- D0RACE
- January 17, 2002

## Slide 2

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## New Tape Facilities

- Sharing STK PowderHorn silo with other lab customers
- have 6-7 x 9940 drives for us.
- 1000 tape slots
- All  online data and fnal-farm output going there, 80 tapes so far.
- Move next week  to our own PowderHorn
- Robot assembled and tested
- Will send all data there starting next week.

- Dzero STK PowderHorn silo
- Has  9 x 9940 drives now, up to 20 drives.
- 5500 tape slots total.

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Use Existing AML/2 for MC

- M2 tapes are all read-only
- Have 6 LTO drives.
- 100 GB cartridge
- Very Reliable in tests so far  (1 problem in 30 TB)
- All MC and  Group generated data is going there. Have written 8 TB so far with no problems.

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Storing Group Data in SAM

- Each group has tapes allocated for specific tiers of data: gen, d0gstar, d0sim, reconstructed, root-tuples, others.
- Each group will have a tape allocation limit
- Group data is added with special tier designation “-bygroup” to distinguish it form  farm and other production data.
- Groups set up so far include top, higgs, and tauid, bphysics, emid, and np.

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## SAM Distributed Computing

- Fnal-farm
- ClueD0

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Distributed Reconstruction Farm

- Mass Storage

**Worker**
**1**

**Worker**
**2**

**Worker**
**3**

**Worker**
**N**

- D0bbin Farm
- Server

**No disks are cross mounted. Worker nodes get files directly from MSS via encp. Data is moved by SAM using rcp from where it is cached to where it is needed.**

**90 dual processor Linux nodes (growing)**
**30 GB disk each**
**100 Mbit ethernet NICs on workers**
**D0bbin is 4 processor SGI O2000, Gigabit NIC**

- LAN

**Major SAM upgrade **
**Very close to working**

*In Production *
*with SAM Station v3_2_18 December 5, 2001*

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Distributed Analysis Cluster ClueD0

**Desktop**
**1**

**Desktop**
**2**

**Desktop**
**3**

**Desktop**
**100+**

**Mass Storage**

**Clued0-ripon**
**(file server node)**

- ClueD0-ripon node has 640 GB SAM cache disk
- 100+ linux desktop nodes have 4-5TB distributed SAM cache
- 5 nodes in SAM mode now
- Studying scalability and deployment issues

- All (tape) data enters the ClueD0 station through the main file server node ClueD0-ripon. The station
- migrates data as needed and manages the cache distributed among the many desktop constituents.

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Site and Global Issues

- MSS

- SAM
- Station 1

- SAM
- Station 2

- SAM
- Station 3

- SAM
- Station 6

- SAM
- Station 5

- SAM
- Station 4

- Remote
- SAM
- Station

- Station Configuration
- Replica location
- Prefer
- Avoid
- Forwarding
- File stores can be forwarded through other stations
- Routing (soon)
-  Can set up routes for replica transfers

- Extra-domain transfers
- Currently use bbftp
- (parallel transfer protocol)

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Workshop Plans for Station Installations

- Will help setup remote stations
- Beforehand need:
- UPS/UPD
- Station name
- Station admins
- Station node info
- Station disks

- Lee Lueking  - D0RACE Meeting

- January 17,2002

## Hope To See You All There!