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If the pool creation thread happens to detect the luns in the scsi target, the size parameters will be calculated as part of the refreshPool called from storagePoolCreate(). This means the virStoragePoolFCRefreshThread (commit id '512b874') waiting to run and "refresh" the pool will essentially double the allocation and capacity values. A separate refresh would correct the values. To avoid this, the FCRefreshThread needs to reinitialize the pool size values prior to calling virStorageBackendSCSIFindLUs which eventually calls virStorageBackendSCSINewLun and updates the size values for each volume found.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>