Greg Freemyer schrieb:
>
> >> Greg Freemyer schrieb:
> >> >
> >> > >> On Fri, Aug 02, 2002 at 02:19:28PM +0200, Christian Thalinger
> >> wrote:
> >> > >> > Yep, IDE drive with write cache. Sorry, i could guess it myself.
> >> > >> > Without write cache recovery seems to be ok. Now i have to find
> >> out
> >> > >> > how to disable write cache of IDE drives on a 3ware controller
> >> ;-)
> >> >
> >> > >> This can be done both via the 3ware BIOS which you can enter at
> >> bootup,
> >> > >> or via the 3dmd web-based management system.
> >> >
> >> > >> --> Jijo
> >> >
> >> > I know that turns off the write cache on the 3ware controller itself.
> >> >
> >> > Does it also turn off the write cache on the underlying IDE drives?
>
> >> There are tools around, usually from the drive vendor, with which you
> >> can change cache configuration. Unfortunately there are IDE drives
> >> around which don't disable write cache even if they are configured to do
> >> so.
>
> >> Simon
>
> Simon,
>
> I believe the 3ware controller effectively hides the IDE nature of the drives
> from the OS/bios and I doubt if the drive vendor's tools are smart enough to
> work in a 3ware environment.
You're right.
>
> Are you suggesting that in a 3ware environment, one should move the IDE
> drives to a computer with standard IDE controllers; turn off the write
> cache, then move them back behind the 3ware controller?
Exactly.
>
> I can see that working if the drives store that piece of their config in
> Non-volatile RAM, but I don't have that level of knowledge.
There are several ways a harddisk can do this. The cheapest way would be
that the drive writes those configuration data on a reserved sector on
the disk. It doesn't matter how the drive does it, the only question is
whether the drive actually _does_ what it is configured to do.
Simon
>
> If that is what needs to be done, I can certainly do it, but it does seem to
> be a pain.
>
> Greg Freemyer
> Internet Engineer
> Deployment and Integration Specialist
> Compaq ASE - Tru64 v4, v5
> Compaq Master ASE - SAN Architect
> The Norcross Group
> www.NorcrossGroup.com
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