1) There are many paths in multipath devices,
2) Add/delete devices when iSCSI login/logout or FC link up/down.
Multipath process so slowly that it is not satisfied some applications, For example,
openstack is often timeout in waiting for the creation of multipath devices.
The reason of the low processing efficiency I think is that multipath process uevent
message one by one, and each one also produce a new dm addition/change/deletion
uevent message to increased system resource consumption, actually most of these uevent
message have no sense at all.
So, can we find out a way to reduce these uevent messages to promote multipath
processing efficiency? Personally, I think we can merge these uevent messages before
processing. For example, during the 4 iSCSI session login procedures, we can wait for a
moment until the addition uevent messages of 4 paths are all arrived, and then we can
merge these uevent messages to one and deal with it at once. The way to deal with
deletion uevent messages is the same.
How do you think about? Any points of view are welcome.
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