HP P6000 Continuous Access Implementation Guide (T3680-96431, August 2012)

8 Operating system procedures
This chapter describes operating system procedures that accompany remote replication procedures,
especially for failover and recovery.
Resuming host I/O after failover
Procedures for detecting disk devices and restarting I/O operations after DR group failover differ
among operating systems.
HP OpenVMS
• If the remote hosts are shut down, boot them now.
Booting the hosts enables OpenVMS to recognize the drives.
• If the remote hosts are not shut down, issue the following command from a privileged account
to enable OpenVMS to recognize the drives:
MCR SYSMAN IO AUTOCONFIGURE/LOG
HP Tru64 UNIX
• If the remote hosts are shut down, boot them now.
Booting the hosts enables Tru64 UNIX to recognize the drives.
• If the remote hosts are not shut down, use the following command to recognize the drives:
hwmgr –scan scsi
This may take a while for large configurations, in which case, scan only the SCSI buses that
have added units, scanning only one bus at a time using the following command where x is
the SCSI bus number:
hwmgr –scan scsi –bus x
HP-UX
To resume I/O in HP-UX:
1. Do one of the following:
• If the remote hosts are shut down, boot them now.
Booting the hosts enables HP-UX to recognize the drives.
• If the remote hosts are running, issue the # ioscan -fncdisk command to scan for
new devices.
2. If the device special files are not present, issue the # insf -e command to add the special
files.
A subsequent ioscan will return the devices with the special files.
a. When the remote hosts are running (and the disks and special files are present), you must
create folders for the new vgxx devices. Create the initial directory using the mkdir
command, and then create the special file using the mknod command:
# mkdir <volumeGroupName>
# mknod <volumeGroupName> group c 64 minor#
Example:
# mkdir /dev/vg09
118 Operating system procedures