HP XP P9500 Storage - Manual (Page 18)

Review system conditions and resulting behaviors related to host mode option 48 in the following
table.
Table 2 System behavior for host mode option 48
Behavior when ON Behavior when OFF Event
No failover, even when applications are
executed. Failover occurs only when certain
applications are executed. Normal operation.
The S-VOL receives more
read commands than •
Updates from a host go to P-VOL, and
S-VOL status remains PAIR.
•
Updates from a host go to S-VOL, and
S-VOL status becomes SSWS.
allowed by the threshold,
• • The S-VOL responds to the read
command as quickly as the P-VOL
responds. The S-VOL responds slower to the read
command than the P-VOL does. The
S-VOL takes several milliseconds to
respond.
and receives no write
command.
Same as when option 48 is OFF. The S-VOL receives one or
more write commands. •
Updates from a host go to S-VOL, and
S-VOL status becomes SSWS.
• The S-VOL responds to the read
command as quickly as the P-VOL
responds.
See the HP P9000 Provisioning for Open Systems User Guide for setting a host mode option.
Sharing volumes with other HP software products
ESAM volumes can be used as volumes for other HP software products, such as Business Copy or
Virtual LUN.
The following table shows the ESAM volumes that can be shared with other software. Only those
volumes listed can be shared.
Table 3 Volume types that can be shared with ESAM volumes
Used as ESAM
S-VOL? Used as ESAM
P-VOL? Volumes Product
Yes Yes Volume where an LU path is defined LUN Manager
No No Volume where no LU path is defined
Yes Yes Volume where LUN security is applied
Yes Yes Customized Volume volume Open Volume
Management
No No System disk
Yes Yes LUSE volume LUN Expansion
No No N/A Volume Shredder
Yes Yes V-VOL (virtual volume) Thin Provisioning
No No Pool volume
Yes Yes External volume (after mapping is finished) External Storage
Yes No Business Copy P-VOL Business Copy
No No Business Copy S-VOL
No No Reserved volume
No No Data volume, virtual volume, pool volume Snapshot
No No P-VOL, S-VOL Continuous Access
Synchronous
18 Planning, system requirements, and recommendations