Messages in this thread |  | | Date | Tue, 10 Sep 2002 12:30:47 +0200 | From | (Heinz J . Mauelshagen) | Subject | Re: [RFC] Multi-path IO in 2.5/2.6 ? |
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On Mon, Sep 09, 2002 at 12:49:44PM +0200, Lars Marowsky-Bree wrote: > Morning everyone, > > I hope people are waking up by now ;-) > > So, what is the take on "multi-path IO" (in particular, storage) in 2.5/2.6? > > Right now, we have md multipathing in 2.4 (+ an enhancement to that one by > Jens Axboe and myself, which however was ignored on l-k ;-), an enhancement to > LVM1 and various hardware-specific and thus obviously wrong approaches. > > I am looking at what to do for 2.5. I have considered porting the small > changes from 2.4 to md 2.5. The LVM1 changes are probably and out gone, as > LVM1 doesn't work still. > > I noticed that EVMS duplicates the entire md layer internally (great way to > code, really!), so that might also require changing if I update the md code. > > Or can the LVM2 device-mapper be used to do that more cleanly?
We have a multi-path target for device-mapper planned for later this year.
This will be a multi-path addon to the generic mapping service(s) device-mapper already provides which can multi-path access to any arbitrary given block device, not just logical volumes.
> > I wonder whether anyone has given this some thought already.
We did ;)
> > > Sincerely, > Lars Marowsky-Brée <lmb@suse.de> > > -- > Immortality is an adequate definition of high availability for me. > --- Gregory F. Pfister > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
--
Regards, Heinz -- The LVM Guy --
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Heinz Mauelshagen Sistina Software Inc. Senior Consultant/Developer Am Sonnenhang 11 56242 Marienrachdorf Germany Mauelshagen@Sistina.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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