HP XP P9500 Storage - Manual (Page 58)

Restrictions
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The system disk cannot be created on a THP-VOL.
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A system disk cannot be used for any other function or connected to a port.
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Normal data cannot be stored on the system disk.
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The bind mode of Cache Residency must not be set to the system disk.
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I/O cannot be issued from the host of the open system because the system disk cannot be
defined SCSI path.
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The system disk should not be deleted or blocked while it is being used. Delete or block the
system disk when it is not being used.
Guidelines
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Although the system disk can be created in an external volume, it is best to use only internal
volumes.
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Although there can be up to 16 volumes of system disk created throughout the entire storage
system, best practice is to have only one system disk per storage system.
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In a mixed configuration of open and mainframe system volumes in a storage system, it is
best to select open volumes for the system disk.
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If you have more than one system disk on your storage system, and one of them is blocked,
the unblocked system disks may not be usable. In this case, delete the blocked system disk,
and then use the other normal system disks.
58 Configuring custom-sized provisioning