[Gllug] RAID Partitions

[Richard Jones]

On Mon, May 10, 2004 at 12:38:58PM +0100, John Hearns wrote:
> On Mon, 2004-05-10 at 12:23, Andrew Halliwell wrote:
> 
> > 
> > I noticed something recently called "network raid"...
> > It'll "mirror" any block device (even an md).
> > Might be worth looking into.
> 
> Me! Me! Please Sir!
> 
> I have used DRBD http://www.drbd.org to set up a high availability
> cluster.
> 
> The basis is that there is a 'pretend' block device, in my case /dev/nb0
> associated with a real disk device. You mount this
> device and write to it. The data is mirrored over the network to 
> a corresponding device on another machine. Watch that you don't have it
> mounted on the other machine! There are also tweaks in how the data
> is written.

Sounds slow!  Do you have a specially reserved network to take this
traffic?  How does it handle network failures?

At one job I had, I had to write a network driver which worked over
SCSI - kind of the same thing but in reverse :-) I forget exactly why
I did this (it was over 10 years ago), but I suspect it was because
SCSI was a lot faster than AUI ethernet in those days, and they needed
the speed.

Rich.

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