SCSI-3 reservations are persistent across SCSI bus resets and support multiple paths from a host to a disk. In contrast, only one host can use SCSI-2 reservations with one path. If the need arises to block access to a device because of data integrity concerns, only one host and one path remain active. The requirements for larger clusters, with multiple nodes reading and writing to storage in a controlled manner, make SCSI-2 reservations obsolete.
Info retrieve from:
http://sfdoccentral.symantec.com/sf/5.0/hpux/html/vcs_install/ch_vcs_install_iofence4.html
Info retrieve from:
http://sfdoccentral.symantec.com/sf/5.0/hpux/html/vcs_install/ch_vcs_install_iofence4.html
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