HP P9000 External Storage for Open and Mainframe Systems User Guide (AV400-96392, October 2011)

• Make sure that an external volume is accessed only from the local storage system side once
the external volume is mapped.
◦ Make sure that the external volume, which has been mapped as an internal virtual volume,
is not accessed from a host that is connected to the external storage system.
◦ Make sure that the external volume, which has been mapped as an internal virtual volume,
is not manipulated by a copy function or some other functions of the external storage
system.
◦ If you need to access the mapped external volumes from the external storage system,
perform the operation explained in “Disconnecting external storage system or external
volume” (page 50).
Hosts can access the external storage system volumes that have not been mapped as the
internal volumes.
• Do not map multiplatform volumes of external storage systems as internal volumes.
• When an external storage system that has an ownership is connected to the P9500 storage
system, configure the external path to the primary controller in the external storage system as
primary path.
Ownership is an exclusive right to control volumes. A controller that has an ownership is called
a primary controller. If a external path to a controller without ownership is configured as
primary path, the ownership will be transferred and it may affect performance.
Recommended applications according to HDD type
Table 2 (page 33) and Table 3 (page 33) show the recommended level of the application of
mapped external volume according to the hard disk drive (HDD) type of the external volume.
Table 2 When the emulation type of the external volume is for OPEN
HDD typeApplication
SATA**SAS/FC*/Flash Drive
Not RecommendedOKDatabase
Online Transaction Processing (OLTP)
Not RecommendedOKFile Operation from Host
(Both of Read and Write)
OKOKFile Operation from Host
(Mainly Read)
RecommendedOKBackup
RecommendedOKArchive
*FC = Fibre channel
**SATA = Serial Advanced Technology Attachment
Table 3 When the emulation type of the external volume is for Mainframe
HDD typeApplication
SATASAS/FC/Flash Drive
Not RecommendedNot RecommendedDatabase
Online Transaction Processing (OLTP)
Not RecommendedNot RecommendedSystem Volumes
Guidelines for External Storage operations 33