| Dynamic Reconfiguration User's Guide 2.5.1 |
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Contents
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| Chapter 2 DR Environment and Administration | > 2.3 DR Configuration and Administration Issues | > 2.3.3 DR Administration Issues | > 2.3.3.1 I/O Device Administration |
Disk controllers are numbered consecutively as the devfsadm(1M) command encounters them. On a newly inserted board, disk controllers are assigned the next available lowest number by devfsadm(1M).
If a re-attached system board consists of the same I/O configuration as it was detached: the same I/O controllers and the same I/O devices installed at the same slots, the system keeps the same disk controller numbers as before. Otherwise, different numbers may be assigned. In such a case, re-attaching may require changes of /etc/vfstab and may affect some applications.
The system administrator needs to manage I/O configuration with regard to this issue.
Critical file systems that cannot be umounted (See umount(1M)) for the DR operation must be protected by I/O Multi-pathing, e.g. disk mirroring software. Because GP7000F model 1000/2000 and PRIMEPOWER 800/1000/2000 don't support the removal of kernel memory, if the system disk, on which OS is installed, is installed on the boot board (See section 2.3.2.1"Kernel memory allocation option"), the system disk doesn't have to be configured particularly for DR detach operation.
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Contents
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