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IBM PowerHA SystemMirror V7.2.1 for IBM AIX Updates by Anthony Steel, Matthew W Radford, Fabio Martins, Maria-Katharina Esser, Bing He, Bunphot Chuprasertsuk, Bernhard Buehler, Shawn Bodily, Dino Quintero

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SCSI reservations
This appendix describes SCSI reservation, and how it can be used to provide faster disk fallover times when the underlaying storage supports this feature. For example, SCSI 3 Persistent Reservation allows the stripe group manager, also known as file system manager, to “fence” disks during node fallover by removing the reservation keys for that node. In contrast, non-PR disk fallover causes the system to wait until the disk lease expires.
 
Attention: You do not run these commands in your systems. By running these commands, ...

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