Dr And Ap Interaction; Dr And Idns - Sun Microsystems Sun Enterprise 10000 Dynamic Reconfiguration User Manual

W corresponds to the partition number.
When the reconfiguration sequence is executed after a board is detached, the /dev
links for all of the disk partitions on that board are deleted. The remaining boards
retain their current numbering. Disk controllers on a newly inserted board are
assigned the next available lowest number by disks(1M).
Note – The disk controller number is part of the /dev link name used to access the
disk. If that number changes during the reconfiguration sequence, the /dev link
name also changes. This change may affect file system tables and software, such as
Solstice DiskSuite™, which use the /dev link names. Update /etc/vfstab files
and execute other administrative actions to change the /dev link names.

DR and AP Interaction

DR notifies the AP subsystem when system boards are attached, detached, or placed
in the drain state. In addition, DR queries AP about which controllers are in the AP
database and their status (active or inactive). This communication occurs between
the dr_daemon(1M) and ap_daemon(1M). If the ap_daemon(1M) is not present,
an error message is placed in the syslog messages buffer of the domain and DR
operations continue without error. To disable this interaction, use the -a option
when you invoke dr_daemon(1M). See the dr_daemon(1M) man page in the Sun
Enterprise 10000 Dynamic Reconfiguration Reference Manual.
If you are using AP version 2.1, the operating environment automatically switches
off the active disk controllers on outgoing boards during the complete-detach phase
of DR. If you are using AP version 2.0, you need to manually switch off the active
disk controllers before you start the complete-detach phase. For the Solaris 8
operating environment, you must upgrade to AP version 2.3. For more information
about DR and AP interaction, see the Sun Enterprise Servers Alternate Pathing 2.3
User's Guide. For more information about AP and SDS, refer to the RAS Companion.

DR and IDNs

The IDN feature allows domains to communicate to each other over the interconnect
by using standard TCP/IP protocols. To provide this capability, the IDN feature
maintains detailed information about the hardware configuration and is dependent
on the hardware configuration of the member domains.
Chapter 9