GLYPH<SM590000> CP capacity boost using zIIP conversion during the boost period. If the customer has zIIP  processors, these processors can be converted for the temporary boost interval to  general-purpose processors (CPs) for the selected LPARs. After the boost period ends,  the ZIIPs resume their characterization. No other software cost is associated with the  zIIPs during the conversion (boost) period.  GLYPH<SM590000> To activate and deactivate the eBod temporary capacity record to provide more physical  zIIPs for an IPL or Shutdown Boost. GLYPH<SM590000> To dynamically modify LPAR weights, as might be needed to modify the sharing of  physical zIIP capacity during a Boost period. GLYPH<SM590000> To drive the invocation of the PROC that indicates the beginning of a shutdown process  (and the start of the shut-down Boost). GLYPH<SM590000> To take advantage of new composite HW API reconfiguration actions. GLYPH<SM590000> To control the level of parallelism that is present in the workload at startup (for example,  starting middleware regions) and shutdown (for example, performing an orderly shutdown  of middleware).  More temporary zIIP boost records can be obtained by way of eBOD for supplementing  the existing available customer zIIPs. The temporary zIIP boost records must be activated  before planned operations and deactivated at the end of the boost period (automation  software can be used for this purpose). b. With Fixes. a. Boost must be enabled for LPARs to opt in. c. Subcapacity boost might be available during the boost period to guest operating systems except for z/OS. d. zIIP processor capacity boost is only available if customer has at least one active processor characterized as zIIP.  More zIIPs can be used if obtained through eBOD (temporary zIIP boost records). The client’s automation product can be used to automate and control the following System  Recovery Boost activities: SMT is the hardware capability to process up to two simultaneous threads in a single core,  sharing the resources of the superscalar core. This capability improves the system capacity  and efficiency in the usage of the processor, which increases the overall throughput of the  system. The z15 can run up two threads simultaneously in the same processor, which dynamically  shares resources of the core, such as cache, translation lookaside buffer (TLB), and  execution resources. It provides better utilization of the cores and more processing capacity. SMT$^{4}$ is supported for zIIPs and IFLs. 4 SMT is also enabled (not user configurable) by default for SAPs. Chapter 7. Operating system support  281 Simultaneous multithreading Automation Table 7-14 Operating system support for System Recovery Boost Boost type a z/OS  V2R4 z/OS  V2R3 z/OS  V2R2 z/OS  V2R1 z/VM  V7R1 z/VM  V6R4 z/TPF  V1R1 z/VSE  V6R2 Linux  on Z Subcapacity Boost Y Y b N N Y bc N Y b N N zIIP to CP capacity boost d Y Y b N N N N N N N