george.shuklin at gmail
Apr 7, 2012, 5:40 PM
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[XCP] [BUG] [SM] wrong filter in lvm.conf with multipath-enabled SR (LVMoISCSI)
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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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[XCP] [BUG] [SM] wrong filter in lvm.conf with multipath-enabled SR (LVMoISCSI)