CentOS - Nov 2012 - disk device lvm iscsi questions ....

Hi,

I have an iscsistorage which I attached to a new centos 6.3 server. I
added logic volumes as usual, the block devices (sdb & sdc) showed up in
dmesg; I can mount and access the stored files.

Now we did an firmware software update to that storage (while
unmounted/detached from the fileserver) and after reboot of the storage
and reatache the iscsi nodes I do get new devices. (sdd & sde)

The last time I remember a simple vgchange -ay changed all neede
settings so that I can mount and use the volumes as expected.

But this time I do get an IO error like

  /dev/sun7110to_dali_LUN_3/lvol0: read failed after 0 of 4096 at
1610608476160: Eingabe-/Ausgabefehler

but also:

  1 logical volume(s) in volume group "sun7110to_dali_LUN_3" now
active

What might be messed up? What can I try do get the storage/filesystems
back online?

	Thanks for any sugesstion and regards . G?tz


-- 
G?tz Reinicke - IT-Koordinator - Filmakademie Baden-W?rttemberg GmbH

----- Original Message -----
| Hi,
| 
| I have an iscsistorage which I attached to a new centos 6.3 server. I
| added logic volumes as usual, the block devices (sdb & sdc) showed up
| in
| dmesg; I can mount and access the stored files.
| 
| Now we did an firmware software update to that storage (while
| unmounted/detached from the fileserver) and after reboot of the
| storage
| and reatache the iscsi nodes I do get new devices. (sdd & sde)
| 
| The last time I remember a simple vgchange -ay changed all neede
| settings so that I can mount and use the volumes as expected.
| 
| But this time I do get an IO error like
| 
|   /dev/sun7110to_dali_LUN_3/lvol0: read failed after 0 of 4096 at
| 1610608476160: Eingabe-/Ausgabefehler
| 
| but also:
| 
|   1 logical volume(s) in volume group "sun7110to_dali_LUN_3" now
|   active
| 
| What might be messed up? What can I try do get the
| storage/filesystems
| back online?
| 
| 	Thanks for any sugesstion and regards . G?tz
| 
| 
| --
| G?tz Reinicke - IT-Koordinator - Filmakademie Baden-W?rttemberg GmbH
| 
| 
| _______________________________________________
| CentOS mailing list
| CentOS at centos.org
| http://lists.centos.org/mailman/listinfo/centos
| 

Sounds like the update may have renamed the old devices to something new.  This
has happened once to be with a Dell Equallogic firmware update.  Are you
mounting the devices using a device name or using device labels?  If the former
you should use labels if you created them or the UUID.  If you have a look in
/dev/disk you'll see all the options available to your OS.  If you choice to
go with UUID then have a look in /dev/disk/by-uuid to get the path

-- 
James A. Peltier
Manager, IT Services - Research Computing Group
Simon Fraser University - Burnaby Campus
Phone   : 778-782-6573
Fax     : 778-782-3045
E-Mail  : jpeltier at sfu.ca
Website : http://www.sfu.ca/itservices
          http://blogs.sfu.ca/people/jpeltier

"The smartest people are constantly revising their understanding,
reconsidering a problem they thought they?d already solved. They?re open to new
points of view, new information, new ideas, contradictions, and challenges to
their own way of thinking." - Jeff Bezos

G?tz,

Did you remove the devices as well? I was working with an HP MSA and
unless you removed the devices from multipath before the firmware
update I ran into the errors you're seeing. It's because the old
devices are still known to multipath, but don't map to a LUN on the
target anymore.

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Online_Storage_Reconfiguration_Guide/removing_devices.html

-Hal

On Tue, Nov 6, 2012 at 5:14 AM, G?tz Reinicke - IT Koordinator
<goetz.reinicke at filmakademie.de> wrote:
> Hi,
>
> I have an iscsistorage which I attached to a new centos 6.3 server. I
> added logic volumes as usual, the block devices (sdb & sdc) showed up
in
> dmesg; I can mount and access the stored files.
>
> Now we did an firmware software update to that storage (while
> unmounted/detached from the fileserver) and after reboot of the storage
> and reatache the iscsi nodes I do get new devices. (sdd & sde)
>
> The last time I remember a simple vgchange -ay changed all neede
> settings so that I can mount and use the volumes as expected.
>
> But this time I do get an IO error like
>
>   /dev/sun7110to_dali_LUN_3/lvol0: read failed after 0 of 4096 at
> 1610608476160: Eingabe-/Ausgabefehler
>
> but also:
>
>   1 logical volume(s) in volume group "sun7110to_dali_LUN_3" now
active
>
> What might be messed up? What can I try do get the storage/filesystems
> back online?
>
>         Thanks for any sugesstion and regards . G?tz
>
>
> --
> G?tz Reinicke - IT-Koordinator - Filmakademie Baden-W?rttemberg GmbH
>
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>