HP-UX 11i v3 Crash Dump Improvements

Page 7
= Reentrant dump device
=
available CPUs
= CPUs assigned to a dump unit
Figure 4: reentrant
devices only accessible
via a single HBA port
Figure 5: reentrant
devices accessible via
3 HBA ports
Reentrant
D
evices
and Dump Units
Uncompressed
Dumps
R
R
Single Dump Unit
3 Dump Units
R
R
R
R
R
= HBA port
D1
D1 D2
D3
= Concurrent dump device
=
available CPUs
= CPUs assigned to a dump unit
Figure 6: concurrent
devices, one HBA port
Figure 7: concurrent
devices, three HBA ports
Concurrent
D
evices
and Dump Units
Uncompressed
Dumps
C
C
3 Dump Units
3 Du
mp Units
C
C
C
C
C
= HBA port
D2
D1
D2
D3
D1
D3
Figures 4 and 5 illustrate the relationship between devices controlled by reentrant dump drivers
(“reentrant dump devices”) and dump units. Multiple reentrant devices can be accessed in
parallel if they are on separate HBA ports. In Figure 4 the three reentrant devices are only
accessible via a single HBA port and thus get assigned to a single dump unit. In Figure 5 the
reentrant devices are accessible via three different HBA ports, allowing three dump units to be
created.
Figure 6 and 7 illustrate the relationship between devices controlled by concurrent dump drivers
(“concurrent dump devices”) and dump units. Multiple concurrent devices can be accessed in
parallel irrespective of which controller ports they are configured under. Each concurrent device
can therefore be in a separate dump unit, even if the devices are only accessible through a single
HBA port.