Ramon Vennik <ramon@vennik.com.nocrap> wrote in message news:<3f0bb80a$0$282$ba620e4c@reader1.news.skynet. be>...
> certainly the Sybase mirroring won't benefit any performance goal.
> Maybe you should do some basic benchmarking about how much performance
> is lost with this md_mirror setting.
> Compare the numbers with I/O to a single submirror without the md_mirror
> parameter and (if you want) with Sybase mirroring.

That's exactly what I will do today.

>
> PS where/how did you encounter the problem that showed you the
> write-on-write problem ?
>

I have not yet ... but in the course of trying to find out more about
SDS, I read about "write-on-write" problem. I searched on google, saw
this:

http://dbforums.com/arch/158/2003/5/782082

Searching Sunsolve, saw this:

Bug ID: 4331413
http://sunsolve.sun.com/private-cgi/...e_ 32=4306468