On Fri, 17 Jul 2009, Robert LeBlanc wrote:
> Thanks for looking into it. A little more info about the problem that I have
> so that when implementing a fix, it will be covered.
>
> 1. Most devices settle (Fibre Channel is settled at this point)
> 2. local script is executed which runs all the scripts in local-top (this is
> where LVM and madam (I think) are run to activate the LVM VG or build the
> madam RAID, but the SCSI disk that my LVM is on has not been found yet, so
> nothing is activated)
> 3. wait_for_udev 10 (This returns immediately as udev for some reason thinks
> everything is settleted)
> 4. Init waits for ROOT to show up.
> 5. 3.5 seconds later, the SCSI disk with LVM show up, but LVM VG is never
> tried to be activated again.
> 6. About 177 seconds later init gives up looking for root and drops to a
> shell.
sure, full ack on the analysis.
current workaround is to boot with appropriate rootdelay=<sec> bootarg.
this is also recommended in the release notes.
I don't think rootdelay does that, from what I can tell in the script, it only defines how long to do the Wait for Root to show up script, which happens after local-top is run. If scsi_wait_scan will work, then that sounds good, it's not working currently though as you stated.
a more profund way is to modprobe scsi_wait_scan in the udev script.
cc udev Maintiner to getting an update on the status of that?
> So by moving the execution of the local-top scripts execution, when it is
> waiting for ROOT to show up, it is also looking to see if there are new
> devices that have LVM or madam partitions that can be used as root, instead
> of only basic partitions. I tried to make the workaround/fix as generic as
> possible.
>
> Thank you,
>
> Robert LeBlanc
> Life Sciences & Undergraduate Education Computer Support
> Brigham Young University
well current scripts don't mind to be run X time, but this loop shouldn't
be needed. scsi_wait_scan needs however still to be ported to ata drivers,
but it is already widely implemented in scsi drivers.
The loop was already there, I just reordered some of the script to make use of the loop.
Thanks,
Robert LeBlanc
Life Sciences & Undergraduate Education Computer Support
Brigham Young University