Hub/Switch Installation Guide

Chapter 8 Initial Startup and Verification
HPSS Installation Guide September 2002 469
Release 4.5, Revision 2
8.9.11 Performance
Measure data transfer rates in each COS for:
• Client writes to disk
• Migration from disk to tape
• Staging from tape to disk
• Client reads from disk
Transfer rates should be as fast as the underlying hardware. The actual hardware speeds can be
obtained from their specification and by testing directly from the operating system. For example,
using dd to read and write to each device. Keep in mind that performance testing can often be
limited by other factors external to HPSS. For example, a client reading a file from HPSS may be
limitedbythe performance ofthe UNIXfile systemwhile writingthe filerather thanwhile reading
the file from HPSS.
8.9.12 The Global Fileset File
Ifthereareanyother HPSSsystems runningin thisDCEcell, verifythatall ofthe NameServersare
sharing the same Global Filesets file.