This chapter describes all common errors that occured during several years of practical KVM administration. 'Common errors' means that the problems were not related to hardware properties, the network layout or other special implementation properties. Instead, the problems can occur in any KVM installation. That's why they are described here together with possible solutions and error causes if known.

This is the list of problems covered in this chapter:

• Faulty mapping between iSCSI and multipath devices
• Unnecessary multipath devices
• No multipath devices found
• Remaining DM devices
• Invisible LVM devices
• No communication with a virtual host
• LVM checksum error
• Cannot create logical volumes
• No network communication via vhost interface
• iSCSI hard disk errors
• Error while creating vhosts with vmbuilder
• Hanging process 'libvirtd'
• Live migration error

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