Seagate ST43401N/ND Guida di Installazione Scaricare il pdf (Pagina 21)

CHAPTER 2 Analyze: Documenting Business Requirements

•Disk I/O:

• Use operating system monitors to measure I/Os per second per disk

and controller, and I/O queue lengths per “time window” per server.

• Use Sybase monitors to measure total I/Os, reads, and writes per

second per Sybase device per “time window” per server.

• Concurrency:

• Use Sybase monitors to determine the average lock contention.

• Network I/O:

• Use Sybase monitors to record average execution rates for critical

stored procedures.

• Use operating system monitors to measure the packets per second per

network interface card per “time window” per server.

• Use Sybase monitors to measure the TDS packets (“sent from” and

“received by”) per “time window” per server.

•Memory:

• Use operating system monitors to determine the paging/swapping

rates per second per “time window” per server.

• Use Sybase monitors to determine the data and procedure cache hit

rates per “time window” per server.

See the

Performance and Tuning Guide at

http://manuals.sybase.com:80/onlinebooks/group-

as/asg1250e/perf/@Generic__BookView

for information about using Sybase

tools and stored procedures to monitor performance factors.

Additional Business Requirements

Document any other important operational business requirements, such as:

• Priority list of applications to be migrated

• Constraints

• Need to avoid year/quarter end processing?

• How much downtime is ok?

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Seagate ST43401N/ND Guida di Installazione Pagina 21