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LUNS not getting visible

 
Scorpianzzz
Advisor

LUNS not getting visible

Hi,

I have configured a rx2660 server and presented LUNS to it from EVA4400. The OS installed is 11i v2.

When the system is shutdowned and then powered on, all the LUNS are visible and everything is fine...

Now when i reboot the system, the LUNS disappears...

1. When I do
# vgdisplay -v vg01

vgdisplay: Volume group not activated.
vgdisplay: Cannot display volume group "vg01".

2. When I do
# vgchange -a y vg01

vgchange: Warning: Couldn't attach to the volume group physical volume "/dev/dsk/c4t0d1":
The path of the physical volume refers to a device that does not
exist, or is not configured into the kernel.
vgchange: The path of the physical volume refers to a device that does not
exist, or is not configured into the kernel.
vgchange: Warning: couldn't query physical volume "/dev/dsk/c4t0d1":
The specified path does not correspond to physical volume attached to
this volume group
vgchange: Warning: couldn't query physical volume "/dev/dsk/c6t0d1":
The specified path does not correspond to physical volume attached to
this volume group
vgchange: Warning: couldn't query all of the physical volumes.
vgchange: Couldn't activate volume group "vg01":
Quorum not present, or some physical volume(s) are missing.

3. But when I do
# ioscan -fnCdisk

It shows all physical volume as CLAIMED
... and then ALLOWS me to ACTIVATE Volume Group "vg01"

The file /etc/lvmtab also looks fine...

Can ne1 help me out with this problem. Its urgent...

Regards,
Rajiv
11 REPLIES
Tingli
Esteemed Contributor

Re: LUNS not getting visible

Will insf -e help?
Scorpianzzz
Advisor

Re: LUNS not getting visible

Tried it...
but still it did not work

Even then LUNS happens to be INVISIBLE after reboot
Ron Irving
Trusted Contributor

Re: LUNS not getting visible

Have you tried to vgimport?
Should have been an astronaut.
Scorpianzzz
Advisor

Re: LUNS not getting visible

No I have not tried it...

But will that make any difference...

Cos after giving a proper shutdown command:
# shutdown -h now

the LUNS gets visible... its only during reboot that causes a problem...

Is it b'cos of some OS patch???
Scorpianzzz
Advisor

Re: LUNS not getting visible

I have noticed that the EVA(4400) firmware is old (ie. 9001000) as well as the switch(5.3.0b)...
Is it b'cos of it???
Emil Velez
Honored Contributor

Re: LUNS not getting visible

Agree with previous writer that the EVA might not be ready after boot to present them after the FC card gets initialized.

Older firmware that might need upgrade.

Might want to see if putting a ioscan (with no options) in the lvmrc script before it activates all of the vgs help. This might "wakeup" the eva controller and make it more reliable.

Agree this is a stopgap till you diagnose the real issue. Any other systems on the san experiencing the same issue with that EVA ?
Simeon Harwood
Regular Advisor

Re: LUNS not getting visible

It might be worth doing a low level check too. When the server has rebooted, have a look at the fibre cards to see if you have link lights on or not. Then have a look at the switches to see if the fibre cards are loged in. If you are using Brocade switches, then you can use this command from the switch: -
# switchshow
have a look for the port number that the cable is pluged into, and see if you can see the WWN. If you can see the WWN, the basic connection is there. It may be a masking issue on the EVA.

Sime.
You never had this problem with a pencil and paper!
Sagar Sirdesai
Trusted Contributor

Re: LUNS not getting visible

Hi Rajiv
Are using any Multipath Software.

Sometimes it is possible that the Multipath Software is positioned to run after the vgactivation . Which could cause the LUNS not available when vg activation takes.

Sagar
Suraj K Sankari
Honored Contributor

Re: LUNS not getting visible

Hi,

Are you able to see other's luns if not then check you cables which is connected to Storege box and check your syslog.log file also.

Before shutting down the box are you able to see those LUN's ?

Suraj
Scorpianzzz
Advisor

Re: LUNS not getting visible

Thanks for all ur reply....

The problem has been resolved...

The main culprit was the FC card... replaced it and it worked fine...


Thanks again...
Scorpianzzz
Advisor

Re: LUNS not getting visible

Problem resolved