The following error is displayed when booting XenServer pool master:
"Unexpected inconsistency; Run fsck Manually"

The df -h command shows filesystem is read only.

This is a hardware issue and will require hardware diagnostics, however probable work around would be as follows:

1. Run the following command to make the filesystem read and write:
   Mount –o remount,rw /
2. Edit /etc/fstab and make fsck not to run by changing entries marked 1 1 to 0 0 for root filesystem.
3. Reboot the XenServer.
   XenServer will come up fine skipping fsck on root filesystem.

Problem Cause

The storage controllers and the hard drive issues are the most likely cause.