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KEK preprint 97-63

Use of SONY PetaSite and
DTF Helical Scan Tape Drive
on KEK Central Computer UNIX Cluster

CHEP97, Berlin
April 7-11, 1997

Y. Morita, S. Yashiro, J. Chiba, Y. Watase
KEK, High Energy Accelerator Research Organization
1-1 Oho, Tsukuba, Ibaraki 305 Japan

Y. Kodama, S. Kohno, N. Tanaka
Government & Public Corporation Information Systems Division,
HITACHI, Ltd., Computer Group,
Tsukuba Mitsui bldg. 1-6-1, Takezono, Tsukuba, Ibaraki 305 Japan

abstract

Storing a few tens to a few hundreds of tera bytes of HEP data under distributed UNIX environment is an essential and non-trivial function for HEP computing centers. Performance issues, such as data I/O throughput and data path parallelism for multi-user environment, become critical. We have developed a UNIX tape management system which provides two functions on a single tape library: (1) HSM migration, and (2) a direct tape access method with a file index database. Twenty SONY DTF helical scan tape drives are connected to several UNIX workstation servers at sustained I/O throughput speed of 12 MB/sec. The library has total storage capacity of 20 TB. The system is being used for several KEK Proton Synchrotron fixed target experiments since January 1996.

keyword

HSM; DTF; Tape Library


Y. Morita, S. Yashiro, J. Chiba, Y. Watase
Y. Kodama, S. Kohno, N. Tanaka
Tue Jul 1 14:13:49 JST 1997