$\mathit{RO}_\mathit{run}$ & {\tt virtual\_allocation} & int & sum of virtual\_sizes of all VDIs in this storage repository (in bytes) \\
$\mathit{RO}_\mathit{run}$ & {\tt physical\_utilisation} & int & physical space currently utilised on this storage repository (in bytes). Note that for sparse disk formats, physical\_utilisation may be less than virtual\_allocation \\
$\mathit{RO}_\mathit{ins}$ & {\tt physical\_size} & int & total physical size of the repository (in bytes) \\
+$\mathit{RO}_\mathit{ins}$ & {\tt host} & host ref & physical machine on which the pbd is available \\
+$\mathit{RO}_\mathit{ins}$ & {\tt SR} & SR ref & the storage repository that the pbd realises \\
+$\mathit{RO}_\mathit{ins}$ & {\tt device\_config} & (string $\rightarrow$ string) Map & a config string that is provided to the host's SR-backend-driver \\
+$\mathit{RO}_\mathit{run}$ & {\tt currently\_attached} & bool & is the SR currently attached on this host? \\
+\hline
+\end{longtable}
+\subsection{Additional RPCs associated with class: PBD}