Chapter 5. Database and recovery log
203
mirroring function at a minimum, rather than just operating system software or
disk hardware mirroring.
Although you can mirror either the database or the recovery log, we recommend
that you mirror both. Mirroring both database and log provides better availability
and recoverability.
In Figure 5-3, the Tivoli Storage Manager database volumes are mirrored to two
different disks, so if one fails, the server can still function. The recovery log
volumes are also duplicated. Note that Tivoli Storage Manager still has one
database object and one recovery log object, regardless of whether mirroring is
implemented.
You can use two-way or three-way mirroring. With two-way, there are two copies
of each database or recovery log volume; with three-way, there are three copies
of each database or recovery log volume. Figure 5-3 shows two-way mirroring.
Figure 5-3 Database and recovery log mirroring
All database volume copies are equal, as are all recovery log volume copies.
There is no concept of a master and secondary mirror copy. The server can
continue operating in the event of a failure of any single volume.
Tivoli Storage Manager Database
TSM Recovery Log
dbp_01.dsm
dbp_02.dsm
dbm_01.dsm
dbm_02.dsm
logm_01.dsm
logp_02.dsm
logp_01.dsm
logm_02.dsm
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