Red Hat Bugzilla – Bug 260901
mdadm comes before readonly-root in rc.sysinit so diskless boot cannot have mdadm.conf specify homehost
Last modified: 2008-06-16 22:15:32 EDT
Description of problem:
On a stateless booting system, rc.sysinit runs mdadm -A -s before loading up all
the remote state information, including /etc/mdadm.conf. Therefore mdadm has no
way of knowing what the homehost is supposed to be, so does not start any of the
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Create an array with --homehost=`hostname`, or update an array with
2. Reboot the system. (If the system boots from local disk, you can reproduce
this problem by just removing /etc/mdadm.conf).
3. array is not started.
For a system booting from local disk this is no problem - just put HOMEHOST in
/etc/mdadm.conf and you're done. However, if you want a system to boot stateless
over tftp/pxelinux/NFS, and then automatically start up arrays, there is no
simple way to do it.
It seems to me that there are 2 ways to fix this, depending on whether you
consider the bug to be in mdadm or in initscripts.
mdadm could default to using the current hostname as the HOMEHOST if not
Or you could change rc.sysinit to run mdadm -A -s after all the readonly-root
stateless stuff. Or, just run it twice - I don't think that would hurt anything.
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