Sara, > Summary: scsi sd driver is not emitting a CHANGE uevent for online > disk resizes using VMware’s vsphere.
For the SCSI layer to emit an event on capacity change, the storage device must generate a UNIT ATTENTION with ASC 0x2a and ASCQ 0x9. Very few devices to that. When you do a rescan in sysfs you essentially force SCSI and block to manually go out and discover all the device's properties from scratch. -- Martin K. Petersen Oracle Linux Engineering
