FUJITSU CentricStor V3.1D - Manual (Page 56)

56 U41117-J-Z125-7-76
Optional system functions CentricStor - Virtual Tape Library
2.9.8.3 Software requirements
The “vtlsmirr” key must have been read in and enabled for the mirror function. This is done
by customer support.
Assuming that the hardware requirements are satisfied (see the section above) and the
RAID systems have been defined by the corresponding LUN assignment (see the
section
“Mirrored RAID systems” on page 57 ), the overall system is configured as a mirror system
solely through the existence of the key. No operator intercvention is required for this
purpose.
Example
After the mirror key has been read into a CentricStor system with 6 RAID systems, the
following configuration is established:
Figure 22: “Genuine” and “potential” RAID mirror pairs in a CentricStor system
The first and second RAIDs and also the third and fourth RAIDs form genuine mirror pairs
as the IDs here begin with an odd number and are in unbroken ascending order.
The RAID systems with IDs 6 and 7 do not satisfy the hardware requirements and therefore
form a potential pair. They can be turned into a genuine mirror pair by changing ID 7 to ID 5.
1stRAID 2ndRAID
ID 1 ID 2
RAID mirror pair 1
3rdRAID 4thRAID
ID 3 ID 4
RAID mirror pair 2
5thRAID 6thRAID
ID 6 ID 7
RAID mirror pair 3
Genuine pair Potential pair Genuine pair