On Linux, suppressed device (path) name re-used for another device after reboot
Article ID: 100034316
Updated On:
Description
Error Message
There is no error message.Cause
On Linux, OS device name isn't persistent and it's by design.
VxVM suppressed devices infomation recoreded old device name, so we need to be careful not to confuse suppressed devices and non-suppressed devices.
VxVM suppressed devices infomation recoreded old device name, so we need to be careful not to confuse suppressed devices and non-suppressed devices.
Resolution
For example,
1) Suppress devices from VxVM view by using vxdiskadm command (vxdiskadm -> select 17 --> select 2 ).
# vxdiskadm
Volume Manager Support Operations
Menu:: VolumeManager/Disk
Menu:: VolumeManager/Disk
1 Add or initialize one or more disks
2 Encapsulate one or more disks
:
:
16 Make a disk available for hot-relocation use
17 Prevent multipathing/Suppress devices from VxVM's view
18 Allow multipathing/Unsuppress devices from VxVM's view
2 Encapsulate one or more disks
:
:
16 Make a disk available for hot-relocation use
17 Prevent multipathing/Suppress devices from VxVM's view
18 Allow multipathing/Unsuppress devices from VxVM's view
:
:
? Display help about menu
?? Display help about the menuing system
q Exit from menus
:
? Display help about menu
?? Display help about the menuing system
q Exit from menus
Select an operation to perform: 17
Exclude Devices
Menu:: VolumeManager/Disk/ExcludeDevices
VxVM INFO V-5-2-5950
This operation might lead to some devices being suppressed from VxVM's view
(This operation can be reversed using the vxdiskadm command).
This operation might lead to some devices being suppressed from VxVM's view
(This operation can be reversed using the vxdiskadm command).
Do you want to continue ? [y,n,q,?] (default: y)
Volume Manager Device Operations
Menu:: VolumeManager/Disk/ExcludeDevices
Menu:: VolumeManager/Disk/ExcludeDevices
1 Suppress all paths through a controller from VxVM's view
2 Suppress a path from VxVM's view
3 Suppress disks from VxVM's view by specifying a VID:PID combination
4 Suppress all paths to a disk
5 Prevent multipathing of all disks on a controller by VxVM
6 Prevent multipathing of a disk by VxVM
7 Prevent multipathing of disks by specifying a VID:PID combination
8 List currently suppressed devices
2 Suppress a path from VxVM's view
3 Suppress disks from VxVM's view by specifying a VID:PID combination
4 Suppress all paths to a disk
5 Prevent multipathing of all disks on a controller by VxVM
6 Prevent multipathing of a disk by VxVM
7 Prevent multipathing of disks by specifying a VID:PID combination
8 List currently suppressed devices
? Display help about menu
?? Display help about the menuing system
q Exit from menus
?? Display help about the menuing system
q Exit from menus
Select an operation to perform: 2
:
:
:
:
:
:
Enter a pathname or pattern : [,all,list,list-exclude,q,?] list
PATH (DMPNODE)
---- ---------
sda sda
sdb sdb
sdan disk_0
sdt disk_0
sdw disk_0
sdam disk_1
sdr disk_1
sdu disk_1
sdaa disk_2
sdap disk_2
sdx disk_2
sdag disk_3
sdf disk_3
sdi disk_3
sdao disk_4
sdv disk_4
sdy disk_4
sdah disk_5
sdh disk_5
sdk disk_5
sdab disk_6
sdad disk_6
sdar disk_6
sdae disk_7
sdc disk_7
sdd disk_7
PATH (DMPNODE)
---- ---------
sda sda
sdb sdb
sdan disk_0
sdt disk_0
sdw disk_0
sdam disk_1
sdr disk_1
sdu disk_1
sdaa disk_2
sdap disk_2
sdx disk_2
sdag disk_3
sdf disk_3
sdi disk_3
sdao disk_4
sdv disk_4
sdy disk_4
sdah disk_5
sdh disk_5
sdk disk_5
sdab disk_6
sdad disk_6
sdar disk_6
sdae disk_7
sdc disk_7
sdd disk_7
sdac disk_8
sdaq disk_8
sdz disk_8
sdaf disk_9
sde disk_9
sdg disk_9
sdak disk_10
sdn disk_10
sdq disk_10
sdal disk_11
sdo disk_11
sds disk_11
sdai disk_12
sdj disk_12
sdm disk_12
sdaj disk_13
sdl disk_13
sdp disk_13
Hit RETURN to continue.
sdaq disk_8
sdz disk_8
sdaf disk_9
sde disk_9
sdg disk_9
sdak disk_10
sdn disk_10
sdq disk_10
sdal disk_11
sdo disk_11
sds disk_11
sdai disk_12
sdj disk_12
sdm disk_12
sdaj disk_13
sdl disk_13
sdp disk_13
Hit RETURN to continue.
Select sdac/sdaq/sdz and suppress disk_8 from VxVM's view, then /etc/vx/vxvm.exclude file recoreded those path names.
# more /etc/vx/vxvm.exclude
exclude_all 0
paths
sdac pci-0000:03:00.1-fc-0x23110002ac007071-lun-101 3pardata0_0_98
sdaq pci-0000:03:00.0-fc-0x22120002ac007071-lun-101 3pardata0_0_98
sdz pci-0000:03:00.0-fc-0x20120002ac007071-lun-101 3pardata0_0_98
#
controllers
#
product
#
2) reboot then Linux OS device(path) name could be changed
sdz and sdac was used for disk_8 but after reboot those are used for disk_1 and disk_11.
#vxdmpadm getsubpaths all# more /etc/vx/vxvm.exclude
exclude_all 0
paths
sdac pci-0000:03:00.1-fc-0x23110002ac007071-lun-101 3pardata0_0_98
sdaq pci-0000:03:00.0-fc-0x22120002ac007071-lun-101 3pardata0_0_98
sdz pci-0000:03:00.0-fc-0x20120002ac007071-lun-101 3pardata0_0_98
#
controllers
#
product
#
2) reboot then Linux OS device(path) name could be changed
sdz and sdac was used for disk_8 but after reboot those are used for disk_1 and disk_11.
NAME STATE[A] PATH-TYPE[M] DMPNODENAME ENCLR-NAME CTLR ATTRS PRIORITY
=================================================================================================
sdab ENABLED(A) - disk_0 disk c3 - -
sdad ENABLED(A) - disk_0 disk c4 - -
sdaj ENABLED(A) - disk_0 disk c5 - -
sdaa ENABLED(A) - disk_1 disk c4 - -
sdag ENABLED(A) - disk_1 disk c5 - -
sdz ENABLED(A) - disk_1 disk c3 - -
sdt ENABLED(A) - disk_10 disk c4 - -
sdu ENABLED(A) - disk_10 disk c3 - -
sdy ENABLED(A) - disk_10 disk c5 - -
sdac ENABLED(A) - disk_11 disk c5 - -
sdw ENABLED(A) - disk_11 disk c3 - -
sdx ENABLED(A) - disk_11 disk c4 - -
sdn ENABLED(A) - disk_12 disk c3 - -
sdo ENABLED(A) - disk_12 disk c4 - -
sds ENABLED(A) - disk_12 disk c5 - -
sdq ENABLED(A) - disk_13 disk c4 - -
sdr ENABLED(A) - disk_13 disk c3 - -
sdv ENABLED(A) - disk_13 disk c5 - -
sdah ENABLED(A) - disk_2 disk c3 - -
sdam ENABLED(A) - disk_2 disk c5 - -
sdap ENABLED(A) - disk_2 disk c4 - -
sdh ENABLED(A) - disk_3 disk c3 - -
sdi ENABLED(A) - disk_3 disk c4 - -
sdm ENABLED(A) - disk_3 disk c5 - -
sdae ENABLED(A) - disk_4 disk c3 - -
sdaf ENABLED(A) - disk_4 disk c4 - -
sdal ENABLED(A) - disk_4 disk c5 - -
sdk ENABLED(A) - disk_5 disk c3 - -
sdl ENABLED(A) - disk_5 disk c4 - -
sdp ENABLED(A) - disk_5 disk c5 - -
sdak ENABLED(A) - disk_6 disk c3 - -
sdao ENABLED(A) - disk_6 disk c5 - -
sdar ENABLED(A) - disk_6 disk c4 - -
sdc ENABLED(A) - disk_7 disk c4 - -
sdd ENABLED(A) - disk_7 disk c3 - -
sdf ENABLED(A) - disk_7 disk c5 - -
sde ENABLED(A) - disk_9 disk c3 - -
sdg ENABLED(A) - disk_9 disk c4 - -
sdj ENABLED(A) - disk_9 disk c5 - -
sda ENABLED(A) - sda other_disks c2 - -
sdb ENABLED(A) - sdb other_disks c2 - -
#
3) try to unsuppress or suppress paths again by using vxdiskadm command.
pathname "list" and "list-exclude" showed same device (path) names for multiple devices.
Enter a pathname or pattern : [,all,list,list-exclude,q,?] list
PATH (DMPNODE)
---- ---------
sda sda
sdb sdb
sdab disk_0
sdad disk_0
sdaj disk_0
sdaa disk_1
sdag disk_1
sdz disk_1
sdah disk_2
sdam disk_2
sdap disk_2
sdh disk_3
sdi disk_3
sdm disk_3
sdae disk_4
sdaf disk_4
sdal disk_4
sdk disk_5
sdl disk_5
sdp disk_5
sdak disk_6
sdao disk_6
sdar disk_6
sdc disk_7
sdd disk_7
sdf disk_7
sde disk_9
sdg disk_9
sdj disk_9
sdt disk_10
sdu disk_10
sdy disk_10
sdac disk_11
sdw disk_11
sdx disk_11
sdn disk_12
sdo disk_12
sds disk_12
sdq disk_13
sdr disk_13
sdv disk_13
Hit RETURN to continue.
pathname "list" and "list-exclude" showed same device (path) names for multiple devices.
Enter a pathname or pattern : [
PATH (DMPNODE)
---- ---------
sda sda
sdb sdb
sdab disk_0
sdad disk_0
sdaj disk_0
sdaa disk_1
sdag disk_1
sdz disk_1
sdah disk_2
sdam disk_2
sdap disk_2
sdh disk_3
sdi disk_3
sdm disk_3
sdae disk_4
sdaf disk_4
sdal disk_4
sdk disk_5
sdl disk_5
sdp disk_5
sdak disk_6
sdao disk_6
sdar disk_6
sdc disk_7
sdd disk_7
sdf disk_7
sde disk_9
sdg disk_9
sdj disk_9
sdt disk_10
sdu disk_10
sdy disk_10
sdac disk_11
sdw disk_11
sdx disk_11
sdn disk_12
sdo disk_12
sds disk_12
sdq disk_13
sdr disk_13
sdv disk_13
Hit RETURN to continue.
Enter a pathname or pattern : [,all,list,list-exclude,q,?] list-exclude
Devices excluded from VxVM:
--------------------------
Devices excluded from VxVM:
--------------------------
Paths : sdac sdaq sdz
Controllers : None
VID:PID : None
--------------------------
So we need to check /etc/vx/vxvm.exclude file and confirm which device (path) we want to suppress or unsuppress again.
Issue/Introduction
On linux, OS device name isn't persistent, so there is the possibility that same device (path) name could be used for another device even though that device is suppressed from VxVM's view.
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