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Re: [libvirt] directory storage pools reported available space



于 2010年12月03日 14:00, Ryan Harper 写道:
We recently had an issue with not being able to allocate the full
capacity of a directory based storage pool.  The reported value via
pool-info was larger than what was available to the image creator.

Looking at the storage code, in virStorageBackendFileSystemRefresh()
we're using statvfs, and reporting back

    pool->def->available = ((unsigned long long)sb.f_bfree *
                           (unsigned long long)sb.f_bsize);

Which is the amount of blocks available, including any root reservation
if present on the filesystem.

This does't line up with df output , which at least on RHEL5 and 6
systems reports the available space from f_bavail, which excludes
and reserved space.

Is it reasonable to have the available value line up with output from df
and not report reserved space?

It's misleading not to exclude the reserved space, probly it will be
nicer to report both the actually avaiable spaces and the reserved
ones.

- Osier


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