On Sat, Feb 10, 2018 at 11:50 AM, Willem Jan Withagen <wjw_at_digiware.nl> wrote: > On 10/02/2018 19:24, Alan Somers wrote: > >> On Sat, Feb 10, 2018 at 10:28 AM, Willem Jan Withagen <wjw_at_digiware.nl >> <mailto:wjw_at_digiware.nl>> wrote: >> >> Hi, >> >> This has been disabled on ZFS since last November. >> And I do understand the rationale on this. >> >> BUT >> >> I've now upgraded some of my HEAD Ceph test systems and they now >> fail, since Ceph uses posix_fallocate() to allocate space for the >> FileStore-journal. >> >> Is there any expectation that this is going to fixed in any near >> future? >> >> --WjW >> >> >> No. It's fundamentally impossible to support posix_fallocate on a COW >> filesystem like ZFS. Ceph should be taught to ignore an EINVAL result, >> since the system call is merely advisory. >> > > Yup, that was what I'm going to do. > But then I would like to know how to annotate it. > > And I guess that I'd get reactions submitting code to fix this, since the > journal could run out of space. > So I'd beter know what is going on. > > I seem to remember that on a pool level is is possible to reserve space > whilest creating a filesystem? And then it could/should be fixed when > building the disk-infra for an OSD. > Yes, you can easily reserve space for an entire filesystem. Just do for example "zfs create -o reservation=64GB mypool/myfs" .Received on Sat Feb 10 2018 - 18:21:54 UTC
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