Re: ASM Host Mirroring

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_at_gmail.com> 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_at_gmail.com> 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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