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vdev_draid_min_asize() returns the minimum size of a child vdev. This is used when determining if a disk is big enough to replace a child. It's also used by zdb to determine how big of a child to make to test replacement. vdev_draid_min_asize() says that the child’s asize has to be at least 1/Nth of the entire draid’s asize, which is the same logic as raidz. However, this contradicts the code in vdev_draid_open(), which calculates the draid’s asize based on a reduced child size: An additional 32MB of scratch space is reserved at the end of each child for use by the dRAID expansion feature So the problem is that you can replace a draid disk with one that’s vdev_draid_min_asize(), but it actually needs to be larger to accommodate the additional 32MB. The replacement is allowed and everything works at first (since the reserved space is at the end, and we don’t try to use it yet), but when you try to close and reopen the pool, vdev_draid_open() calculates a smaller asize for the draid, because of the smaller leaf, which is not allowed. I think the confusion is that vdev_draid_min_asize() is correctly returning the amount of required *allocatable* space in a leaf, but the actual *size* of the leaf needs to be at least 32MB more than that. ztest_vdev_attach_detach() assumes that it can attach that size of device, and it actually can (the kernel/libzpool accepts it), but it then later causes zdb to not be able to open the pool. This commit changes vdev_draid_min_asize() to return the required size of the leaf, not the size that draid will make available to the metaslab allocator. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #11459 Closes #12221 |
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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.