Re: ASM Host Mirroring
- From: "LS Cheng" <exriscer@xxxxxxxxx>
- To: "Roman Podshivalov" <roman.podshivalov@xxxxxxxxx>
- Date: Tue, 19 Feb 2008 22:44:21 +0100
Hi Roman
This will be a two node 10gR2 RAC set up. So no preferred read :-(
Imagine the write request comes from node 1, i.e +ASM1, so ASM1 will issue
one write request in local SAN and the other remote? How about reads?
Looking soe stretch cluster setup diagrams with host based mirroring t gives
impression that when write is requested from one node, that node writes
locally and send a request thorugh some sort of network to remote node.
Thanks
--
LSC
On 2/19/08, Roman Podshivalov <roman.podshivalov@xxxxxxxxx> wrote:
>
> Hi,
>
> If I got the question right - ASM will issue two write requests to
> separate controllers/ports your arrays are connected to. It's same as any
> other software based LVS - no tricks there. 2 mirrors 2 write requests.
> Starting with 11g you can define preferred mirror for read requests if I
> remember correctly.
>
> --romas
>
>
> On 2/19/08, LS Cheng <exriscer@xxxxxxxxx> wrote:
> >
> > Hi
> >
> > Does anyone know how ASM does host based mirroring. For example we have
> > two storage arrays with 10 metres distance, two failure groups are created,
> > one per array. How does ASM mirror the extents? Network? Using the Cluster
> > Interconnect? Or a seperate Network?
> >
> > Cheers
> >
> > --
> > LSC
> >
> >
>
>
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