[Linux-cluster] SCSI Reservations & Red Hat Cluster Suite

[Jeff Macfarland]

True. Any solution for auto discovery? I've no problem with statically
defining a device,  but that would be pretty nice if possible.

Alex Kompel wrote:
> On Fri, Mar 28, 2008 at 8:15 AM, Ryan O'Hara <rohara at redhat.com> wrote:
>> The reason for the cluster LVM2 requirement is for device discovery. The
>> scripts use LVM commands to find cluster volumes and then gets a list of
>> devices that make up those volumes. Consider the alternative -- users
>> would have to manually define a list of devices that need
>> registrations/reservations. This would have to be defined on each node.
>> What make this even more problematic is that each node may have
>> different device names for shared storage devices (ie. what may be
>> /deb/sdb on one node may be /deb/sdc on another). Furthermore, those
>> device names could change between reboots. The general solution is to
>> query clvmd for a list of cluster volumes and get a list of devices for
>> those volumes.
> 
> You can also use symbolic links under /dev/disk/by-id/ which are
> persistent across nodes/reboots.
> 
> -Alex
> 
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Jeff Macfarland (jmacfarland at nexatech.com)
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