Re: let md auto-detect 128+ raid members, fix potential race condition

[Alexandre Oliva <aoliva@redhat.com>]

On Jul 31, 2006, Alexandre Oliva <aoliva@redhat.com> wrote:

>> mdadm --assemble --scan --homehost='<system>' --auto-update-homehost \
>> --auto=yes --run

>> in your initrd, having set the hostname correctly first.  It might do
>> exactly what you want.

> I'll give it a try some time tomorrow, since I won't turn on that
> noisy box today any more; my daughter is already asleep :-)

But then, I could use my own desktop to test it :-)

FWIW, here's the patch for Fedora rawhide's mkinitrd that worked for
me.  I figured even without --homehost it worked fine, even without
HOMEHOST set in mdadm.conf.

I hope copying mdadm.conf to initrd won't ever hurt, can you think of
any case in which it would?

--- /sbin/mkinitrd	2006-07-26 15:43:41.000000000 -0300
+++ /tmp/mkinitrd	2006-08-01 00:06:14.000000000 -0300
@@ -1240,10 +1240,19 @@
 emitdms
 
 if [ -n "$raiddevices" ]; then
+  if test -f /sbin/mdadm.static; then
+    if test -f /etc/mdadm.conf; then
+      inst /etc/mdadm.conf "$MNTIMAGE/etc/mdadm.conf"
+    fi
+    inst /sbin/mdadm.static "$MNTIMAGE/sbin/mdadm"
+    emit "mkdir /dev/md"
+    emit "mdadm --quiet --assemble --scan --auto-update-homehost --auto=yes --run"
+  else
     for dev in $raiddevices; do
         cp -a /dev/${dev} $MNTIMAGE/dev
         emit "raidautorun /dev/${dev}"
     done
+  fi
 fi
 
 if [ -n "$vg_list" ]; then

-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Secretary for FSF Latin America        http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}