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Serapheim Dimitropoulos
48df24d4ce
= Motivation At Delphix we are heavy users of kernel crash dumps that are captured through a crash kernel that is spawned whenever the main kernel panics. The way that this works internally is that a certain amount of memory is reserved while the main system is running so the initramfs of the crash kernel can be loaded when a panic occurs. In order to keep reserved memory at minimum we've been historically trying to identify the binaries that are part of the kernel's initramfs that are big and finding ways of either making them smaller or do not include them in the initramfs image. An example is always stripping the DWARF info of the ZFS kernel module copy that is included in the initramfs image of both our running and our crash kernel (the difference in size there is 76MB vs 4MB). We've recently identified that libzpool has been the largest binary in our initramfs images - currently sized around 17MB. = This Patch The ZFS scripts do not explicitly copy libzpool to initramfs. They copy zdb which pulls in libzpool as a dependency. Given that both zdb and libzpool are not really essential for initramfs (e.g. we'll still have access to the once the root filesystem is unpacked) this patch removes them from initramfs. Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: John Kennedy <john.kennedy@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com> Closes #12616
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.