HP StorageWorks Continuous Access EVA Administrator Guide (T3687-96043, December 2005)

4 Operating system speciﬁcs

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 D R group failover differ among

operating systems. Host operating system procedures are provided here for your convenience.

HP OpenVMS procedure to resume I/O

1. If the remote hosts are shut down, boot them now. Booting the hosts enables OpenVMS to

recognize the drives.

2. If the remote hosts are not shut down, use the following comm and from a privileged account to

enable O penVMS to recognize the drives: MCR SYSMAN IO AUTOCONFIGURE/LOG

HP Tru64 UN

IX pr ocedure to r esume I/O

1. If the rem

otehostsareshutdown,bootthemnow.BootingthehostsenablesTru64UNIXto

recognize the drives.

2. If the remote hosts are not shut down, use the following command to recognize the drives:

hwmgr –scan scsi

This may t

akeawhileforlargeconﬁgurations. If this is the case, scan only the SCSI buses that

have new

units added. Scan only one bus at a time. Use the following command:

hwmgr –scan scsi –bus x

(where x is the SCSI bus number)

HP–UX procedure to resume I/O

1. If the remote hosts are shut down, boot them now. Booting the hosts enables HP-UX to recognize

the drives. If the system is already up, you will need to execute the following command to

scan for the new devices:

# ioscan -fnCdisk

2. If the device special ﬁles are not present you would need to execute the following. This will

add the special ﬁles.

# insf -e

Asubsequentioscan will return the devices with the special ﬁles.

• Once the system is up (and disks / special ﬁles are present), you need to create the folders

for the new vgxx devices. C reate the initial directory using mkdir command, then make

the special ﬁle using the mknod command.

# mkdir <volumeGroupName>

# mknod <volumeGroupName> group c 64 minor#

Example:

# mkdir /dev/vg09

# mknod /dev/vg09/group c 64 0x090000

• O nce the folders are created, the disks show up, and special ﬁles are present, you can then

use the vgimport to create the virtual group.

HP StorageWorks Continuous Access EVA administrator guide