jmsalvo wrote:
>
> We are well on our way and on the final few steps of migrating from
> Oracle to ASE.

Congratulations.

> Our configuration is an E3500 running Solaris8, with dual A1000s. The
> disks in each A1000 is mirrored to the other A1000 by Solstice
> DiskSuite.

Given that the E3500 has internal FC-AL disks, I would have
gone with that and an external FC-AL unit to suit for the
mirroring. The i/o performance would have been a lot higher.

> Now I noticed that metainit actually says about
> "Write-On-Write Problem" .... in particular for raw I/O and direct
> I/O, that you need to have
>
> set md_mirror:md_mirror_wow_flg=0x20
>
> in your /etc/system file ... but it will degrade performance.
> Question ... by how much ?

That's something you'd need to ask Sun tech support about.
I don't expect the perforamnce impact to be really noticeable.

> Is anyone using ASE with SDS with the above turned on ?
> Or should I just use ASE's mirroring ?

I would stick to SDS's mirroring. Turn the option on (I haven't
- but then I don't have your exact combination either but I've
noticed no problems) if you are concerned but don't forget that
the A1000s have a write cache and the parallel write method
should write to each mirror at the same time. Some of the
comments in the reference seem to suggest its not applicable
to ASE either (cf. dirty-bit and memory page).

-am © 2003