VG is seen missing after patching the server.
Issue
- One of the VGs is seen missing after patching the server.
- When the VG was available, it was using
/dev/mapper/mpathXdevice
PV VG Fmt Attr PSize PFree
/dev/mapper/mpathb my_vg lvm2 a-- 100.00g 1016.00m
/dev/mapper/mpathc my_vg lvm2 a-- 200.00g 0
After patching the OS OR due to some other reason, partition is seen to have been created on the mpathX device, as such VG is seen missing
Partitions on mpathb and mpathc
$ cat sos_commands/block/parted_-s_.dev.dm-0_unit_s_print
Model: Linux device-mapper (multipath) (dm)
Disk /dev/dm-0: 209715840s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 63s 209712509s 209712447s primary lvm
-------------------------------------------------------------------------
$ cat sos_commands/block/parted_-s_.dev.dm-15_unit_s_print
Model: Linux device-mapper (multipath) (dm)
Disk /dev/dm-15: 419431680s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 63s 419425019s 419424957s primary lvm
From device mapper info, we see
$ egrep "mpathb|mpathc" sos_commands/devicemapper/dmsetup_info_-c
mpathc 253 15 L--w 1 1 0 mpath-360061234567e2c0000017e2c00002ba7
mpathbp1 253 4 L--w 0 1 0 part1-mpath-360060123456e2c0000017e2c00002ba6
mpathcp1 253 18 L--w 0 1 0 part1-mpath-360061234567e2c0000017e2c00002ba7
mpathb 253 0 L--w 1 1 0 mpath-360060123456e2c0000017e2c00002ba6
Environment
- Red Hat Enterprise Linux (RHEL) 6
- DM-Multipath
- LVM
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