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RE: [linux-lvm] dual adapter machine


there is a commercial software called "Duplex Data Manager (DDM)" from
Fujitsu-Siemens-Computers for exactly this.
Unfortunately I can't found an online documentation.
I can send you a PDF and a powerpoint ducumentation if needed.
In the german magazin "Linux Enterprise" (1.2000) was an article about DDM.

DDM seems very well designed, you can use it in conjunction with MD, LVM etc.

But an open-source tool would be nice too.

Klaus Franken fth2 siemens de    +49 911 978 3707
Siemens Business Services IP 21F

> -----Original Message-----
> From: Michael Lausch [mailto:mla 1012surf net]
> Sent: Monday, August 07, 2000 12:33 PM
> To: linux-lvm msede com
> Subject: [linux-lvm] dual adapter machine
> We are going to use linux LVM on some servers using 2 FCAL adapters
> per machine, since our RAID System (HP XP256) has two FCAL
> channels. So in order to have no single point of failure, we want to
> use 2 FCAL adapters in each machine, connected to the same (virttual)
> disks. This means i see the same partition on two controlers.
> For example: controller 1, SCSIID 3, LUN 1, Partition 1
> and          controller 2, SCSIID 3, LUN 1, Partition 1
> refer to the same blocks.
> So when everything is okay i'll talk to the disk through c1d3l1s1 (in
> solaris notation). When this FCAL has an error, i want to talk to the
> same disk via c2d3l1s1. How can this be done with linux LVM?
> Anybody got any ideas? 
> thanks in advance.
> -- 
> michael lausch

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