File migration in the NCAR mass storage system

Author

Thanhardt, Erich ; Harano, Gene

Author_Institution

Nat. Center for Atmos. Res., Boulder, CO, USA

fYear

1988

fDate

Oct. 31 1988-Nov. 3 1988

Firstpage

114

Lastpage

121

Abstract

As of July 25, 1988, the mass storage system (MSS) at the National Center for Atmospheric Research (NCAR) contained 55.8 tb of user data in more than 291000 bitfiles averaging greater than 23 megabytes (MB) in size. The bulk of the data is housed in a (nonautomated) library of IBM 3480 tape cartridges, and the remainder resides temporarily on a disk farm of IBM 3380e disks. A discussion is presented of the strategy used in developing an effective management policy for the movement of files between the disk farm and tape library, the algorithms chosen, the mechanisms implemented for tuning those algorithms, and the effects on system performance experienced as a result.<>

Keywords

storage management; IBM 3480 tape cartridges; NCAR mass storage system; National Center for Atmospheric Research; file migration; management policy; movement of files; system performance; Centralized control; Communication system control; Delay; Laser tuning; Libraries; Operating systems; Process control; System performance; Throughput; Weight control;

fLanguage

English

Publisher

ieee

Conference_Titel

Mass Storage Systems, 1988. Storage Systems: Perspectives. Digest of Papers., Ninth IEEE Symposium on

Conference_Location

Monterey, CA, USA

Print_ISBN

0-8186-8880-7

Type

conf

DOI

10.1109/MASS.1988.72796

Filename

72796