z990 Logical Channel SubSystems (LCSSs) and support for
greater than 15 Logical Partitions (LP)
In order to provide the increased channel connectivity required to support the scalability of the z990, the z990 channel I/O SubSystem delivers a breakthrough in con- nectivity, by providing up to 4 LCSS per CEC, each of which can support up to 256 CHPIDs with exploitation soft- ware installed. This support is provided in such a way that is transparent to the programs operating in the logical par- tition. Each Logical Channel SubSystem may have from 1 to 256 CHPIDs and may in turn be confi gured with 1 to 15 logical partitions. Each Logical Partition (LPAR) runs under a single LCSS. As with previous zSeries servers, Multiple Image Facility (MIF) channel sharing as well as all other channel subsystem features are available to each Logical Partition confi gured to each Logical Channel SubSystem.
Up tp 30 Logical Partitions
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Up to 256 |
|
| Up to 256 |
|
|
|
| Up to 256 |
|
|
| Up to 256 | |||||||||
LCSS0 CHPIDs | LCSS1 |
| CHPIDs | LCSS2 |
| CHPIDs | LCSS3 | CHPIDs | |||||||||||||||||
Physical Channel IDs (PCHIDs) SubSystem
In order to accommodate the new support for up to 1024 CHPIDs introduced with the Logical Channel SubSystem (LCSS) a new Physical Channel ID (PCHID) is being intro- duced. The PCHID represents the physical location of an I/O feature in the I/O cage. CHPID numbers are no longer
IOCP - IOCDS
|
|
|
| Partitions |
|
|
|
|
|
|
| Partitions |
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| LCSS0 |
|
|
|
| LCSS1 | |||||||||
|
|
| CHPIDs |
|
| CHPIDs |
|
|
|
| ||||||||
| 4F |
|
| 12 | 52 | EF |
| 00 |
|
| 02 |
| 12 | 2F | EF | |||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
HCD - HSA or IOCDS - HSA
102
103
104
110
200
201
202
2B0
2C5
Physical Channels (PCHIDs)
Note: Crypto no longer requires a CHPID
14
