[Linux-cluster] iscsi-target server need to be part of cluster ?

[Bernard Chew]

Hi Micheal and Lon,

Thank you for the quick replies. The mentioned setup is in  a staging environment; the iscsi target server will be replaced by a iscsi san in actual deployment. I wanted to ensure the iscsi target server is deployed correctly for testing.

Regards,
Bernard Chew

--- original message ---
From: "Michael Will" <mwill at penguincomputing.com>
Subject: RE: [Linux-cluster] iscsi-target server need to be part of cluster?
Date: 28th July 2007
Time: 3:6:29 

But it is questionable if you are achieving what you planned to achieve.


What was the original intent of using GFS and cluster-suite?
1. redundancy in storage / failover and loadbalancing of the file
servers?

Your iscsitarget is now the single point of failure in the storage,
which is identical to having used
only one single NFS server in the first place. 

2. aggragate bandwidth of multiple file servers sharing the same files? 
Aggragate bandwidth using several gfs nodes to access the same data on
the same iscsi target again is unlikely to be higher. After all you now
have the distributed locking overhead, and you still go through the same
iscsitarget pipe. 

Once you have the iscsitarget serve up nonlocal storage (i.e. SAN luns)
and have more than one iscsitarget server, then it becomes interesting
again, and then they would likely be part of the redhat cluster.
d
Michael 

-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Lon Hohberger
Sent: Friday, July 27, 2007 10:11 AM
To: linux clustering
Subject: Re: [Linux-cluster] iscsi-target server need to be part of
cluster?

On Fri, Jul 27, 2007 at 10:33:37AM +0800, Bernard Chew wrote:
> 
> Hi,
> 
> If we have 5 servers with 1 server acting as an iscsi-target for the
remaining 4 servers, do we need to include the iscsi-target server as
part of the cluster? The intention is to export the partition via iscsi
from 1 server and use it as a GFS filesystem for the remaining 4
servers.

No, you don't need machines acting solely as storage targets to be part
of the cluster.

--
Lon Hohberger - Software Engineer - Red Hat, Inc.

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