Hello,
This is documented in the multipath-tools' FAQ.
In lvm2.conf, you need to exclude the paths from the scaning, and allow
DM devices to be scaned.
regards,
cvaroqui
shahid shaikh wrote:
Hi,
I am trying to test multipathing on lvm2.
Configuration that i am using is as below:
OS : SLES9 ( kernel 2.6.5)
lvm : lvm2-2.00.15-0.3
multipath-tools : multipath-tools-0.2.1
udev : udev-021-36.32
sysfs : sblim-cmpi-sysfs-1.1.5-0.2
hotplug : hotplug-0.44-32.21 and hotplugctl-0.08-264.1
device-mapper : device-mapper-1.00.09-17.5
I tried following things :
When I dont have multipaths for LUNs:
1) I tried to create PVs on LUNs using pvcreate
2) Then VGs using above PVs by command vgcreate
3) Then I have created some LVs on VGs.
4) I also fire some I/O on these LVs.
All aboe commands worked succesfully reflecting changes in pvscan, vgscan
and lvscan.
When I have multiplepaths to LUNs:
I tried to create PV on one of the device but on doing pvscan it shows me
some other device.
e.g My LUN no 5 has for paths so I can see these four paths as
/dev/sdb, /dev/sdg, /dev/sdl and /dev/sdq.
then i did following
linux# pvcreate /dev/sdb
/dev/sdb successfully created
linux# pvscan
Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdb not
/dev/sdq
Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdg not
/dev/sdq
Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdl not
/dev/sdq
PV /dev/sdq VG vg01 lvm2 [1.00 GB / 972.00 MB free]
Total: 1 [1.00 GB] / in use: 1 [1.00 GB] / in no VG: 0 [0 ]
linux# vgcreate vg01
succesfully created
linux# vgscan
Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdb not
/dev/sdq
Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdg not
/dev/sdq
Found duplicate PV owucgI06ZCWQHX6rM3Jyj6UKsr5MOt7E: using /dev/sdl not
/dev/sdq
I tried the same thing with all permutations but i couldnt create a volume
group.
I also have multipath-tools-0.3.9 and multipath-tools-0.4.2.
But I am not sure whether they will compatible with kernel 2.6.5.
If you can help me in this scenario I will be thankfull to you.
Please let me know the steps through which I can achieve multipathing on my
configuration.
Thanks and Regards,
Shahid Shaikh.
http://www.patni.com
World-Wide Partnerships. World-Class Solutions.
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