[Gllug] Hardware RAID On-Disc Format

[Huw Lynes]

On Mon, 15 Mar 2004 14:47:30 +0000
"Daniel P. Berrange" <dan at berrange.com> wrote:

> On Mon, Mar 15, 2004 at 02:34:21PM +0000, Huw Lynes wrote:
> > On Mon, 15 Mar 2004 14:02:16 +0000
> > "Daniel P. Berrange" <dan at berrange.com> wrote:
> > 
> > > All in all, I'd never go near an IDE
> > > RAID card & certainly don't assume hardware cards are more reliable or
> > > faster.
> > > 
> > The smarter IDE RAID cards allow hot-swap. We have a couple of AMI cards
> > that do hot-swap. Not massively high-performance but it does save on
> > down-time.
> 
> You can do hot-swap of drives with software RAID too if the plain hardware
> controller supports hot-swap[1] - just make sure the kernel has been told 
> to remove the device from the array first.
> 
Hot swapping normal IDE can be very bad news. Apparently it's to do with which
pins connect first when you re-engage the drive. Reconnect the wrong ones and
zzapp, no more IDE controller. You need a chassis and connectors designed for
it, at which point you are usually talking about hardware raid anyway.

Never tried it, don't want to risk it.


-- 
| Huw Lynes               | The Moving Picture Company  |
| System Administrator    | 127 Wardour Street          |
|.........................| London, W1F 0NL             | 


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