Hardware and Software Systems

In 2005, the NCEDC relocated its archive and distribution system from McCone Hall to a new state-of-the-art computer facility in a new seismically braced building on the Berkeley campus. The facility provides seismically braced equipment racks, gigabit ethernet network, air condioning and power conditioning. The entire facility is powered by a UPS with generator backup.

The currently installed NCEDC facilities consist of a mass storage environment hosted by a Sun V240 host computer, a 100 slot LTO-2 tape library with two tape drives and a 20 TByte capacity, and 10 TBytes of RAID storage all managed with the SAM-FS hierarchical storage management (HSM) software. A dual processor Sun Ultra 60 provides Web services and research account access to the NCEDC, a dual Sun 280R processor provide data import and export services, and a Sun Ultra 450 computer is used for quality control procedures. Two AIT tape libraries will be used to read NCSN continuous data tapes. An 64-bit Linux system hosts a database dedicated to providing data to external users.

The hardware and software system is configured to automatically create multiple copies of each timeseries file. The NCEDC creates an online copy of each file on online RAID, a second copy on LTO-2 tape which is stored online in the tape libraray, and a third copy on LTO-2 tape which is stored offline and offsite. All NCEDC data is therefore online and rapidly accessible by users.

The NCEDC operates two instances of its Oracle database, one for internal operations, and one for external use for user data queries and data distribution programs. The databases are synchronized using multi-master replication.

Berkeley Seismological Laboratory
215 McCone Hall, UC Berkeley, Berkeley, CA 94720-4760
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