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    SubjectRe: RAID superblock confusion
    On Wed, Apr 10, 2002 at 04:49:06PM -0600, Richard Gooch wrote:
    > Mike Fedyk writes:
    > > On Wed, Apr 10, 2002 at 03:39:09PM -0600, Richard Gooch wrote:
    > > > Mike Fedyk writes:
    > > > > On Wed, Apr 10, 2002 at 02:37:48PM -0600, Richard Gooch wrote:
    > > > > >
    > > > > > The device is set up (i.e. SCSI host driver is loaded) long before I
    > > > > > do raidstart /dev/md/0
    > > > >
    > > > > But kernel auto-detection doesn't depend on the raidstart command. If
    > > > > things are setup correctly, you can remove that from your init scripts.
    > > >
    > > > I'm not (explicitely) using auto-detection. When I insmod the raid0
    > > > module, there are no messages about finding devices. All I get is:
    > > > md: raid0 personality registered as nr 2
    > > >
    > > > Only when I run raidstart do I get kernel messages about the devices.
    > > >
    > > > In any case, I should be able to move my devices around (especially
    > > > if /etc/raidtab is still correct), whether or not autostart is
    > > > running. The behaviour I'm observing is a bug (I assume it's not a
    > > > mis-feature, since the raidstart man page tells me that moving devices
    > > > around should be safe).
    > >
    > > Ehh, I ran into this a while ago. When you compile raid as modules
    > > it doesn't use the raid superblocks for anything except for
    > > verification. I took a quick glance at the source and the
    > > auto-detect code is ifdefed out if you compiled as a module.
    >
    > Exactly where is this? A scan with find and grep don't reveal this.
    >

    drivers/md/md.c

    in the ifndef MODULE sectioin.

    > > Ever since I have had raid compiled into my kernels.
    >
    > This is my relevant .config:
    > CONFIG_MD=y
    > CONFIG_BLK_DEV_MD=y
    > CONFIG_MD_LINEAR=m
    > CONFIG_MD_RAID0=m
    > CONFIG_MD_RAID1=m
    > CONFIG_MD_RAID5=m
    > CONFIG_MD_MULTIPATH=m
    >

    Set this to =y and you're set.

    I'd like to see this working from modules though.

    Mike
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