To avoid having to use the 'storage' extended attribute group, and thus
slowing down every retrieval and retry, the VSCSI volume driver uses a
separate VIOS GET to perform hdisk discovery for connect_volume and
disconnect_volume. Previously, this was being done sequentially for all
VIOSes. Since hdisk discovery is a fairly long-running procedure, we
realize some performance benefit by parallelizing these calls. This
change set employs a separate local FeedTask to achieve this result.
Change-Id: I69b49cd7eaf1ec9053441750ae75a465f3b66338
Closes-Bug: 1502227
ca95eaa466