On 09/08/16 16:35, Petter Reinholdtsen wrote: > [ Antonio Russo 2016-07-11 ] >> Sorry, there is no 0.6.5.8 release. The fix does exist in the master branch, >> however. (bc77ba7: OpenZFS 6513 - partially filled holes lose birth time) > > As far as I can see from <URL: https://github.com/zfsonlinux/zfs/issues/4809 > >, > the issue is still unsolved upstream. > > Are you sure that commit is enough to solve the problem? There are others > mentioned in issue #4809. > > See also <URL: https://www.illumos.org/issues/6370 >, > <URL: https://www.illumos.org/issues/6513 > and > <URL: https://www.illumos.org/issues/6844 >. >
It seems there are several issues affecting zfs send/receive when the hole_birth feature is enabled. Commit bc77ba7 fixes one of this issues, but not the others. The best fix right now seems to completely ignore hole_birth. A patch was proposed here that ignores it, and adds a module parameter to enable it back [1]. Options I see going forward: 1) Wait for the patch on PR #4833 to be merged, then import it defaulting to ignore hole_birth until the issue is fixed. 2) If we don't want to wait for the patch to be merged, we can import it anyway but removing the part that adds a kernel module parameter tunable to avoid adding any option that is still not upstreamed. So just disable hole_birth always. 3) Do nothing and wait for upstream to fix this issues with hole_birth and zfs send/receive. Right now, I'm inclined to proceed with option #2 and disable hole_birth until the issues with it are 100% fixed upstream and a new major release is made. Opinions? PS: There is still an user reporting some problems observed even with ignore_hole_birth=1, but is still not 100% clear if in this case the problem is the same. Let's wait some days to see how this evolves [2]. BTW: I'm a bit surprised that this has been raised to RC bug on Debian unstable, but on Ubuntu LTS nobody cares about it. [3] Or I'm missing something? [1] https://github.com/zfsonlinux/zfs/pull/4833 [2] https://github.com/zfsonlinux/zfs/issues/4809#issuecomment-238503468 [3] https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1600060
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