Architecting a vSphere Compute Platform : Planning Host Deployment : 6.7 Impact of vSAN : 6.7.9 Scratch Partition
   
6.7.9 Scratch Partition
Remember to redirect the scratch partition, if applicable. In a design that employs SD/USB or boot from SAN as the installation destination, the host installer does not allow for the creation of a scratch partition during the initial setup process. As part of a manual or scripted post-deployment configuration, configure a local .locker directory on a shared datastore for each host to act as a scratch partition. In addition, configure each host to log into the remote syslog system to set up host log file availability after a reboot. For more information on VMware recommendations when booting hosts from non-persistent storage, see the VMware vSphere Installation and Setup document at http://pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-60-installation-setup-guide.pdf.