I am not qualified to say how the crazy EMC thing works.  It was sufficient
for me that the volume of I/O requests on the EMC during the database
updates was about 1/3rd what it would be during normal business day
processing.  None of the drives in assinged to the volume sets in question
appeared to be overwhelmed.

We also monitored Threshhold Manager during the conversion.  If the EMC or
one of the SCSI controllers had been a bottle neck the I/O Request table
should have been filling up but it was not showing any backlog.

Carl

> -----Original Message-----
> From: Tony Summers [mailto:[log in to unmask]]
> Sent: Tuesday, November 02, 1999 10:25 AM
> To: [log in to unmask]
> Subject: Re: Performance question
>
>
> << We do not use HP's Mirror/iX product but these
> databases do reside on an EMC mirrored disks.  The Symm
> Manager software
> that monitors the EMC box is showing very little disk activity.  >>
>
> How does the EMC stuff work - presumably it has to
> intercept all disk updates and post
> them across to another volume. So could this
> process be bottlenecking your system even though it doesn't
> show much disk activity ?
>