Linux on System z Current & Future Technology - z/VM - IBM
Linux on System z Current & Future Technology - z/VM - IBM
Linux on System z Current & Future Technology - z/VM - IBM
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<strong>IBM</strong> <str<strong>on</strong>g>Linux</str<strong>on</strong>g> and <strong>Technology</strong> Center<strong>System</strong> z kernel features – Core• Add support for physical memory > 4TB (kernel 3.3)– Increase the maximum support memory size from 4TB to 64TB.• Two stage dumper / kdump support (kernel 3.2, s390-tools-1.17.0)– Use a <str<strong>on</strong>g>Linux</str<strong>on</strong>g> kernel to create a system dump• Use a preloaded crashkernel to run in case of a system failure• Can be triggered either as panic acti<strong>on</strong> or by the stand-al<strong>on</strong>e dumper, integratedinto the shutdown acti<strong>on</strong>s framework– Pro• Enhanced dump support that is able to reduce dump size, shared disk space,dump to network, dump to a file-system etc.• The makedumpfile tool can be used to filter the memory of the crashed system– C<strong>on</strong>• kdump is not as reliable as the stand-al<strong>on</strong>e dump tools• kdump cannot dump a z/<strong>VM</strong> named saved system (NSS)• For systems running in LPAR kdump c<strong>on</strong>sumes memory31© 2012 <strong>IBM</strong> Corporati<strong>on</strong>
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