On Tue, Aug 26, 2014 at 5:36 AM, Wang Shen <ws1...@gmail.com> wrote: > Hi, All > I have done some work to test the performance of LUN scanning, use > "iscsiadm" with "--rescan" like what Nova dose. In my test, a host > connected with a lot of LUNs , more than 1000 LUNs. Because "--rescan" > will cause kernel to scan all of the LUNs connected to the host, it > costs several minutes to complete the scanning. > > According to "connect_volume" at line 284 in nova.virt.libvirt.volume.py: > > https://github.com/openstack/nova/blob/master/nova/virt/libvirt/volume.py#L252 > Nova uses "iscsiadm" with "--rescan" to detect new volume, but this > command will scan all of the LUNs, including all the others which > already connected to this host. So if a host has a large number of > LUNs connected to it, the connect_volume will be very slow. > > I think connect_volume needn't scan all of the LUNs, only need scan > the LUN specified by connection_info. > > Is it necessary to discuss a more efficient way to improve this issues. >
It sounds like this is a bug; we use https://bugs.launchpad.net/nova to track bugs so they don't get lost. > > -- > Best wishes > ====================== Peter.W ====================== > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >
_______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
