Designing a Disaster Tolerant Solution Using the Three Data Center Architecture
Designing a Disaster Tolerant Architecture Using Three Data Center with Continuous Access XP
Chapter 6380
The raidscan command must be invoked separately for each host
interface connection to the disk array. For example, if there are two
Fibre Channel host adapters.
# raidscan -p CL1-A
# raidscan -p CL1-B
NOTE There must also be alternate links for each device, and these must be
on different busses inside the XP disk array. For example, these
alternate links may be CL2-E and CL2-F.
Unless the devices have been previously paired either on this or
another host, the devices will show up as SMPL (simplex). Paired
devices will show up as PVOL (primary volume) or SVOL (secondary
volume).
To identify HP-UX device files corresponding to each device
represented by CU:LDEV run the following command:
# ls /dev/rdsk/* | raidscan -find -fx
NOTE Only OPEN-V LUNs are supported in a three data center
configuration. The ioscan output must be checked to verify which
LUNs are OPEN-V LUNs.
XP arrays (XP 10000/XP 12000 and beyond) support external
attached storage devices to be configured as either P-VOL or S-VOL
or both of a Continuous Access pair. From a Continuous Access
perspective, there is no difference between a pair created from either
internal or external devices.
Refer to the HP StorageWorks XP documentation for information on
the configuration requirements of external storage devices attached
to XP arrays and supported external storage devices at
www.docs.hp.com.
9. Determine which devices will be used by the application package.
Define a device group that contains all of these devices. For normal
Three Data Center operations, a package requires three different
device groups for the configuration. For Multi-Hop-Bi-Link and