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markus_b
08-Jun-2012, 19:28
I'm pxe booting IBM blades for installation with autoyast. This works, but is very slow due to the absence of a multipath driver in the initrd installation system.

How can I rebuild the initrd used for installation to include dm-multipath, so my initial boot for installation already uses multipathing ?

After installation I can just add 'dm-multipath' to /etc/sysconfig/kernel and run mkinitrd, but the resulting initrd is much smaller than the one provided for installation over pxe on the SLES11 DVD, so I think it will not work for that purpose.

Are the instructions on how to build such a initrd ?

Markus

amo_vzug
14-Jun-2012, 09:15
You can create an initrd with integrated multipath-driver like this:


$ mkinitrd -f multipath


regards,

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14-Jun-2012, 13:30
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markus_b
18-Jun-2012, 09:30
You can create an initrd with integrated multipath-driver like this:


$ mkinitrd -f multipath


regards,

Yes, but this recreates the standard initrd, which goes into /boot to boot the local system.

I'm talking about the initrd used for booting and installing via pxe, residing in /tftboot on the pxe install server. How to I build/rebuild that one ?

markus_b
18-Jun-2012, 09:33
In the meantime I've found that I can unpack the initrd with cpio and can potentially modify it that way. But it looks to me like 5t is not using a standard init system to start up, there is no inittab or init files started at boot. I do not see where I can add the modprobe command to load the dm-multipath module and start the multipathd during boot.