z/VM: CP Commands and Utilities Reference - z/VM - IBM

v The FORMAT and *dumpid operands can be specified on more than one
request, but only the last value specified for a particular address space is
recorded.
3. You can specify more than one address range on a single VMDUMP
command, and they can be in any order.
4. With the exception of the address space operands and the dump ID, you can
specify the operands in any order. The dump ID must be the last operand in
the string of operands begun by an address space operand.
The contents of a virtual machine dump
VMDUMP
5. VMDUMP processing always creates and records a symptom record when
taking a dump.
6. When you dump any address space, you get pages that have been referred to
and the storage keys for those pages. In addition, VMDUMP dumps this
information for your virtual machine (not necessarily in this order):
v The program status word (PSW)
v General registers
v Control registers
v Access registers
v Floating point registers
v Floating point control register
v Vector registers
v The TOD clock
v The TOD clock comparator
v The TOD programmable register
v The processor timer
v The prefix register
v The prefix page for all virtual processors dumped
v Crypto Domain Index Register
v Crypto Domain Index Mask
v The ASIT and the space ID (userid:space_name) for the primary address
space.
v The host access list associated with the primary address space.
Notes:
a. Access registers are dumped only for XA, ESA, XC, and z/Architecture
virtual machines.
b. The Crypto Domain Index Register and Crypto Domain Index Mask are
dumped only for ESA mode virtual machines that have a virtual Integrated
Cryptographic Facility (ICRF) defined.
c. VMDUMP dumps processor information for each define virtual processor,
up to 64 processors.
7. Each page of virtual machine storage is dumped only once to a file. If a page
is specified in separate calls to the same address space or on more than one
request in continuous output mode, only the first request for the page is
honored; later requests are suppressed. Likewise, if a DCSS or DSS
associated with an address space is specified on more than one request in
continuous output mode, only the first request results in the DCSS being
written to the dump file.
8. Dumps for a V=V virtual machine do not contain pages that have never been
referred to. When a VMDUMP request for a V=V virtual machine contains only
ranges within pages that have not been referred to, only the virtual processor
information that is automatically dumped is placed in the dump (see Usage
Note 6). In continuous mode, this information is added to the dump on the first
Chapter 2. CP Commands 1727