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Storage Notes

dCache Scratch

The dCache scratch area (the volatile, non-tape backed portion of dCache) which is used for temporary file storage has the following characteristics:

Size 253 TB
Erasure Policy/Algorithm LRU (Least Recently Used)
Pools 7
Pool Sizes 43 TB
Dash board http://fndca.fnal.gov
Pool Use by Group http://fndca.fnal.gov/cgi-bin/gratia_sg.py (PublicScratchPools are the volatile)
Max Concurrent Connections 1610
Max gridftp transfers 700
Max dcap transfers 210
Max any other protocol transfers 700

Note: When maximum number of transfer slots for a protocol are hit, new transfers are queued until the number of running transfers goes back below the max.

Bluearc Central Disk

The Bluearc based central disk which provides the various /nova/data /nova/ana /nova/app /nova/prod volumes has the following characteristics:

Size 343 TB (NOvA Assigned)
Erasure Policy/Algorithm None
Max Concurrent Connections (experiment) 5
Max Bandwidth (in/out) 200 MB/s (1.6 Gbit/s)
Locking Threshold 1 MB