Re: 4.x device failure?

From: Poul-Henning Kamp (phk_at_phk.freebsd.dk)
Date: 09/13/04

  • Next message: M. Warner Losh: "Re: [BIKESHED] Giving abort(2) a reason" 
    To: Sam <sah@softcardsystems.com>
Date: Mon, 13 Sep 2004 21:35:52 +0200

    In message <Pine.LNX.4.60.0409131505220.6275@athena>, Sam writes:
    >Ah. Well that answers it. I'll fail unloading of the
    >module if devices are open.
    >
    >This leads to a curiosity as to how the RAID
    >failover modules work at all. I guess if you abstract
    >the real disk(s) under a logical disk you can change
    >the bottom layer without affecting the top. I'll have
    >to look at that code a little closer.

    You should really start to study GEOM in 5.x which gives a nice
    clean framework for all this sort of stuff.

    You can start here for instance:

            http://phk.freebsd.dk/pubs/bsdcan-04.slides.geomtut.pdf 

    -- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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  • Next message: M. Warner Losh: "Re: [BIKESHED] Giving abort(2) a reason"

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