Deleting or moving a user memory board fails if either of the following statements is true:
■The swap area does not have sufficient free space to save data from the user memory to be deleted.
■There are too many locked or ISM pages to be covered by the memory on other system boards.
2.1.1.3I/O Device
(1) Adding an I/O Device
The device driver processing executed by the Solaris OS is based on the premise that all device drivers dynamically recognize newly added devices. In the domain where DR is performed, all device drivers must support the addition of devices by DR.
Upon the addition of an I/O device by DR, the I/O device is reconfigured automatically.
The path name of a device file under /dev is configured as the path name of the newly added I/O device to make the I/O device accessible.
(2) Deleting an I/O Device
An I/O device can be deleted when both of the following conditions are met:
■The device to be deleted is not in use in the domain where the DR operation is to be performed.
■The device drivers in the domain where the DR operation is to be performed support DR.
In most cases the device to be deleted is in use. For example, the root file system or any other file systems requisite for operation cannot be unmounted.
To solve this problem, you can configure the system by using redundant configuration software to make the access path to each requisite I/O device redundant. For a disk drive unit, you can make the unit redundant by using disk mirroring software.
If a device driver that does not support DR is used in the domain, all access to I/O devices controlled by the device driver must be stopped, and the device driver must be unloaded by using the modunload(1M) command.
Chapter 2 What You Must Know Before Using DR