Questions on Disk performance

From: <alan.nguyen_at_au.transport.bombardier.com>
Date: Fri, 13 Sep 2002 11:20:03 +1100

Hi All,

Could anyone please show/explain to me
   How could I find out that the Disks performance and RAID controller (Data
   Path = Wide, Bus Speed = Fast with the Max Transfer Rate = either 10 or 20
   MB/sec ) is not capable of handling the applications ? In other words, based
   on what standard/evidences that the Disks & RAID are a bottleneck ?
   Do the iostat show a number of transfers (tps) per second in unit of
   kbytes/sec ?
          tty re0 re1 fd0 rz0 cpu
     tin tout bps tps bps tps bps tps bps tps us ni sy id
     0 53 335 15 164 9 0 0 5 0 6 1 3 90
     0 22782737 188 948 82 0 0 316 40 38 2 15 45
   Collect tool show the Average Service Time & Average Wait Time of the Disk,
   What are the acceptable figures for these measures ?


Alan

Alan.Nguyen_at_au.transport.bombardier.com
Received on Fri Sep 13 2002 - 01:21:09 NZST

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