Howdy, I hit a snag trying to install Xen4CentOS on a Supermicro based system (X9DRD-7LN4F with the Broadcom/LSI 2308 chipset). I spent a few hours on this today, I'm posting this here in case it helps anyone else and saves them the frustration I dealt with. On this system I did a fresh install of CentOS 7, updated it, rebooted it, then installed Xen. The system was booting fine using the latest 3.10 kernel (3.10.0-514.16 at the time of writing this). But, when it tried to boot the kernel for Xen (4.9.25-27) it failed to do so. On first boot all it showed was a blinking cursor after grub attempted to boot the 4.9 kernel, and it sat there indefinitely. After some digging around I removed the "console=hvc0" setting /etc/default/grub, ran grub2-mkconfig, and tried booting 4.9 again. This time it actually showed messages, leading up to this: [ 186.550326] dracut-initqueue[542]: Warning: dracut-iniqueue timeout - starting timeout scripts [ 186.570380] dracut-initqueue[542]: Warning: dracut-iniqueue timeout - starting timeout scripts [ 187.120156] dracut-initqueue[542]: Warning: dracut-iniqueue timeout - starting timeout scripts [ 188.633714] dracut-initqueue[542]: Warning: dracut-iniqueue timeout - starting timeout scripts [ 189.102305] dracut-initqueue[542]: Warning: dracut-iniqueue timeout - starting timeout scripts [...] [ OK ] Started dracut initqueue hook [ OK ] Reached target Remote File Systems (Pre). [ OK ] Reached target Remote File Systems. [ ***] A start job is running for dev-disk...device (3min 35s / no limit) I let this run for a while to see if anything changed (needed to turn my attention elsewhere). After a couple of hours it was still in the same place. This last line was confusing: [ ***] A start job is running for dev-disk...device (3min 35s / no limit) Had the console not truncated that line and instead just wrapped the full message so I could see it I would have been a much happier person. Turns out dracut was unable to mount the root file system. So I went back into the 3.10 kernel again to see if the mpt2sas or mpt3sas driver was in its initramfs file... and it wasn't: $ sudo lsinitrd -k 4.9.25-27.el7.x86_64 | grep mpt -rw-r--r-- 1 root root 0 May 16 12:39 etc/fstab.empty -rw-r--r-- 1 root root 22 Nov 5 2016 usr/lib/kbd/unimaps/empty.uni For comparison: $ sudo lsinitrd -k 3.10.0-514.16.1.el7.x86_64 | grep mpt -rw-r--r-- 1 root root 0 May 16 04:37 etc/fstab.empty -rw-r--r-- 1 root root 22 Nov 5 2016 usr/lib/kbd/unimaps/empty.uni drwxr-xr-x 2 root root 0 May 16 04:37 usr/lib/modules/3.10.0-514.16.1.el7.x86_64/kernel/drivers/scsi/mpt3sas -rw-r--r-- 1 root root 379021 Apr 12 08:51 usr/lib/modules/3.10.0-514.16.1.el7.x86_64/kernel/drivers/scsi/mpt3sas/mpt2sas.ko So I added it: $ sudo dracut --force --add-drivers mpt3sas --kver=4.9.25-27.el7.x86_64 $ sudo lsinitrd -k 4.9.25-27.el7.x86_64 | grep mpt Arguments: --force --add-drivers 'mpt3sas' --kver '4.9.25-27.el7.x86_64' -rw-r--r-- 1 root root 0 May 16 12:57 etc/fstab.empty -rw-r--r-- 1 root root 22 Nov 5 2016 usr/lib/kbd/unimaps/empty.uni drwxr-xr-x 2 root root 0 May 16 12:57 usr/lib/modules/4.9.25-27.el7.x86_64/kernel/drivers/scsi/mpt3sas -rwxr--r-- 1 root root 374152 May 16 12:57 usr/lib/modules/4.9.25-27.el7.x86_64/kernel/drivers/scsi/mpt3sas/mpt3sas.ko After this I was able to get the 4.9 kernel to boot and Xen is now working. Jerry -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20170516/5f071271/attachment-0004.html>