[CentOS] disk device lvm iscsi questions ....

James A. Peltier jpeltier at sfu.ca
Tue Nov 6 16:30:07 UTC 2012


----- 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 . Götz
| 
| 
| --
| Götz Reinicke - IT-Koordinator - Filmakademie Baden-Württemberg GmbH
| 
| 
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| 

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


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