DUMPSTYLE specifies the method of writing system dumps. DUMPSTYLE is a 32-bit mask, with the following bits defined. Each bit can be set independently. The value of the system parameter is the sum of the values of the bits that have been set. Remaining or undefined values are reserved for VSI use only. Bit Mask Description 0 00000001 0 = Full dump. The entire contents of physical memory are written to the dump file. 1 = Selective dump. The contents of memory are written to the dump file selectively to maximize the usefulness of the dump file while conserving disk space. 1 00000002 0 = Minimal console output. 1 = Full console output (includes stack dump, register contents, and so on). 2 00000004 0 = Dump to system disk. 1 = Dump off system disk (DOSD) to an alternate disk. (see the VSI OpenVMS System Manager's Manual for details.) 3 00000008 0 = Do not compress. 1 = Compress. 4 00000010 0 = Dump shared memory (Alpha Galaxy systems only). 1 = Do not dump shared memory. 5 00000020 0 = Dump all processes and global pages in a selective or interleaved dump. 1 = Only dump key processes and global pages 6 00000040 0 = Dump S2 space in a selective dump. 1 = Do not dump S2 space. 7 00000080 0 = Write a full or selective dump based on the setting of bit 0. 1 = Write an interleaved dump (x86-64 systems only). 8 - 31 Reserved for VSI use only. For Alpha systems and Integrity servers, bit 7 is ignored. For x86-64 systems, bits 2, 4, and 6 are ignored. (Instead of setting bit 2 to specify an alternate dump device, use the SET DUMP/DEVICE command). In addition, the following combinations of bits are not supported: - Neither bit 0 nor bit 7 is set (full dumps are not supported). A selective dump will be written. - Both bit 0 and bit 7 are set (a dump cannot be both selective and interleaved). An interleaved dump will be written. - Both bit 3 and bit 7 are set (interleaved dumps are always compressed). Bit 3 will be ignored. If you plan to enable the Volume Shadowing minimerge feature, be sure to specify DOSD to an alternate disk. NOTE You can save space on the system disk and, in the event of a crash, save time recording the system memory, by using the dump compression feature. Unless you override the default AUTOGEN calculations (by setting DUMPSTYLE in MODPARAMS.DAT), AUTOGEN uses the following algorithm: o On a system with less than 128 MB of memory, the system sets the DUMPSTYLE to 1 (a raw selective dump) and sizes the dump file appropriately. o On a system with 128 MB of memory or greater, the system sets the DUMPSTYLE to 9 (a compressed selective dump), and creates the dump file at two-thirds the value of the corresponding raw dump. Examples: The mask of 00000006 directs the system to send a full dump, with full console output, off the system disk (to the alternate disk). The mask of 00000009 directs the system to compress a selective dump with minimal console output. DUMPSTYLE has AUTOGEN and DYNAMIC attributes.