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

[Götz Reinicke - IT Koordinator]

Am 06.11.12 17:30, schrieb James A. Peltier:
> ----- 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
> 


Hi,

on that storage I did not used labels AFAIK ... it was long ago that I
set that up. So I looked up the uuid, but dont got a working clue for me.

I than tried the steps from Hal Martins mail removing the LVM settings
etc and created a new LVM (PD/VG) with the settings I used for
installing the storage on the old server.

But I still cant mount the volumes.

May be I messed more up than to fix? :(


We dont use multipathing on that storage.


ANY suggestion and hint is very welcome!

	Thanks and best regards. Götz
-- 
Götz Reinicke - IT-Koordinator - Filmakademie Baden-Württemberg GmbH