Function a z/OS V2R3 z/OS V2R2 z/OS V2R1 z/OS V1R13 z/VM V7R1 z/VM V6R4 Linux on Z zEDC$^{b}$ Express Y Y Y N Y c Y c Y d 7.3.5 Special purpose features 7.4 Support by features and functions 7.4.1 LPAR configuration and management Maximum number of PUs per system image The supported Special-purpose feature for z/OS, z/VM, and Linux on Z is listed in Table 7-12. This section addresses operating system support by function. Only the currently in-support  releases are included. Tables in this section use the following convention: A single system image can control several processor units, such as CPs, zIIPs, or IFLs. Table 7-12 Supported Special-purpose feature for z/OS and z/VM a. PTFs might be required for toleration support or use of z14 ZR1 features and function. b. zEnterprise Data Compression. c. For guest use. d. See the IBM support site for Linux on Z. GLYPH<SM590000> N/A: Not applicable GLYPH<SM590000> NA: Not available The maximum number of PUs that is supported by each operating system image and by  special-purpose LPARs are listed in Table 7-13. Important:  For more information about z14 ZR1 processor characterization support, see  3.5, “Processor unit functions” on page 83. Operating system Maximum number of PUs per system image a z/OS V2R3 256 a,b,c z/OS V2R2 256 a,b,c z/OS V2R1 256 a,b,c z/OS V1R13 100 a z/VM V6R4 64 a,d z/VSE V5R2 and later z/VSE Turbo Dispatcher can use up to 4 CPs, and tolerates up to  10-way LPARs z/TPF V1R1 86$^{a}$ CPs CFCC Level 22 and 23 16 CPs or ICFs CPs and ICFs cannot be mixed Table 7-13 Maximum number of PUs per system image Chapter 7. Operating system support  227