HP XP P9500 Storage - Manual (Page 61)

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In a mixed configuration of open and mainframe 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.
Using a system disk 61