Disk Servers (online storage)

Scientific Computing currently has 2 (physical) types of file servers:

• Lustre, a 3 PB (petabyte) parallel distributed file system (15 servers + 2 metadata servers)
• ZFS, hundreds of TB, dual-head  file server (exported via NFS)

The storage on these servers is split up into multiple name spaces for different purposes and different groups, including a read/write-thru cache for Experimental Physics and another for LQCD, a "volatile" scratch space, and user (group) managed "work" areas.  The cache and volatile areas are managed by in-house developed processes that automatically clean the space and enforce hard and soft quota limits.  For additional details see the subsections below.