Ramoops needs a system with persistent RAM so that the content of that area can survive after a restart. It works by logging oopses and panics in a circular buffer. Ramoops is an oops/panic logger that writes its logs to RAM before the system crashes. Its primary purpose is to save kernel crash logs to memory. It saves data in a reserved part of memory, which can then be read from a working kernel. hosts/guests with root filesystems on NFS/iSCSI where networking software and/or hardware has failed), pstore may contain information available for post-mortem debugging not otherwise captured. Pstore is independent of and can run before kdump. Pstore was introduced into Linux to record information (eg. Since it uses local non-volatile memory, pstore works even when kdump cannot. The pstore is backed by local non-volatile memory and presented to the running system via traditional filesystem interfaces. These records, in turn can be referenced to debug kernel problems (currently, the kernel stuffs the tail of the dmesg, which also contains a stack backtrace, into store). Linux provides a persistent storage file system that can store error records when the kernel dies (or reboots or powers off). In this context, networking includes the guest’s network driver and stack, the host’s network driver(s), and the network hardware both on the host and in the surrounding data center. But if kdump writes to a file on a remote server, and networking is down, then kdump cannot work. Kdump captures a wealth of kernel and machine state and writes it to a file for post-mortem debugging. With Linux, the primary method for obtaining debugging information of a serious error or fault is via the kdump mechanism.
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