HP XP P9500 Storage - Manual (Page 28)

Table 4 Data and journal volume specifications
Support specifications Type
Journal volume Data volume
Available Available Virtual LVI volume
Unavailable Available Cache Residency Z volume
2.377 GB 2.377 GB 3380-3 Maximum volume
capacity
1.26 GB 1.26 GB 3380-E
0.63 GB 0.63 GB 3380-J
1.890 GB 1.890 GB 3380-K
0.964GB 0.964GB 3390-1
1.892GB 1.892GB 3390-2
2.838GB 2.838GB 3390-3
3390-3R
8.510GB 8.510GB 3390-9
27.80GB 27.80GB 3390-L
55.60GB 55.60GB 3390-M
Capacity of OPEN-V volumes can be
determined freely, and has dependencies on Cannot be used as data
volumes. OPEN-V
Virtual LVI volume specifications. The minimum
capacity is 48.1 MB, and the maximum
capacity is the same as the user capacity of
one RAID group.
The default capacity of an OPEN-V volume is
the same as the capacity of a RAID group, and
depends on the hard disk drive type and the
RAID configuration.
50 cylinders for a non-OPEN-V volume. 1 cylinder Minimum volume capacity
48.1 MB for an OPEN-V volume.
Duplicating VOLSERs
When the P-VOL is copied to the S-VOL during the initial copy operation, the P-VOL VOLSER
(Volume Serial Number) is also copied to the S-VOL. Therefore, the P-VOL and S-VOL have the
same VOLSER. Because the host operating system does not allow duplicate VOLSERs, the host
system administrator must take precautions to prevent system problems related to duplicate VOLSERs
(such as defining Continuous Access Journal Z S-VOLs not to come online automatically).
CAUTION: If the volumes that become Continuous Access Journal Z S-VOLs are physically attached
to the same system images as the volumes that become the Continuous Access Journal Z P-VOLs,
the potential for error increases. For example, when a Continuous Access Journal Z pair is released,
the old S-VOL is usually offline. When a host system is IPL’d (initial program loaded), the operator
is offered both volumes and asked which volume should be left offline. You can avoid duplication
of the VOLSER as follows:
1.
Identify the volumes that are not accessed by the host system.
2. Perform CHP OFF or some other operation to insure that the volumes are inaccessible.
3. When performing IPL, make sure to perform LOAD CLEAR.
28 Planning volumes, systems