[Xen-API] [XCP] [BUG] [SM] wrong filter in lvm.conf with multipath-enabled SR (LVMoISCSI)

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

Summary: filter statement in lvm.conf does not prevent LVM to use wrong 
PV for iscsi/multipath LVM SR's.
Configuration:
SR (LVMoISCSI), enabled multipath. Hosts do have options "multipathing: 
true; multipathhandle: dmp;" in other-config. multipath -ll shows 
normally operating MP disk.
But one of the host shows in pvdisplay output that PV is on '/dev/sdc', 
not on /dev/mapper/long-mutlipath-id. I looked to /etc/lvm/lvm.conf and 
found it has filter option like this:
    filter = [ "r|/dev/xvd.|", "r|/dev/VG_Xen.*/LV.*|" ]

(no /dev/sd*)

I think there is some chance this cause lvm tools make /dev/sd* device 
PV for LVM, not multipathed one. This happens only on one host in whole 
pool, so it looks be very rare situation (but it is repeatable, every 
pbd-plug).
I done some adhoc fix with filtering out all /dev/sd* devices, but for 
normal fix this shall be coded somewhere in SM, because by fix turn off 
all normal LVMoISCSI and local LVM SR's...

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