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RE: [linux-lvm] Does LVM support alternate links?



I haven't looked closely enough at what's in the stock kernel right now, but last week I noticed that the patched 2.4.2 in RedHat 7.1 contains a multipathing driver, using raid1.c as a starting point.

-----Original Message-----
From: Heinz J. Mauelshagen [mailto:Mauelshagen sistina com]
Sent: Tuesday, April 24, 2001 10:00
To: linux-lvm sistina com
Subject: Re: [linux-lvm] Does LVM support alternate links?


On Fri, Apr 20, 2001 at 07:00:10PM +0200, Jens Bruckmann wrote:
> Hallo everybody,
> 
> I would like to know if the LVM supports alternate-links to the same
> physical device over two fiber-channel links, so if one link fails, LVM
> automatically uses the second link as it does under its "original" HP-UX.

No, as someone else already answered.

There's work queued though to enhance LVM to support multi-pathing.

A brief description of our ideas includes that a path to a device has
properties related to it like for eg. bandwidth or reliability of that
particular path.
These properties will be fed into the automatic decision taking process
in the LVM driver to which path (if there's multiple available) a switch-over
is going to take place.
There'l be CLI and config file support to configure pathes/properties,
keep that state and allow the user to witch over to different pathes manually.

Time line for this is summer.



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