Pstore, The Linux Kernel Persistent Storage File System
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With Linux, the primary method for obtaining debugging information of a serious error or fault is via the kdump mechanism. Kdump captures a wealth of kernel and machine state and writes it to a file for post-mortem debugging. But if kdump writes to a file that is on a remote server, and networking is down, then kdump can not work. (In this context, networking includes the guest’s network driver and stack, or the host’s network driver(s) and stack or the network hardware both on the host and in the surrounding data center.)
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