redhat-list Digest, Vol 77, Issue 18

Wed Jul 21 08:39:30 UTC 2010

Hi, 

To answer you question on why to use IBM RDAC, There is  no need for dm-multipath at all. Easy enough to re-install later.

Regards, 

Amitesh Sahay

Technical Support Assciate (MphasiS an HP company)

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Subject: redhat-list Digest, Vol 77, Issue 18

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Today's Topics:

   1. IBM DS4700 and RDAC (Wahyu Darmawan)

   2. RE: IBM DS4700 and RDAC (Wahyu Darmawan)

   3. Re: IBM DS4700 and RDAC (Marti, Robert)

   4. Re: IBM DS4700 and RDAC (Georgios Magklaras)

----------------------------------------------------------------------

Message: 1

Date: Tue, 20 Jul 2010 10:06:22 +0700

From: Wahyu Darmawan <Wahyu.Darmawan at ag-it.com>

To: General Red Hat Linux discussion list <redhat-list at redhat.com>

Subject: IBM DS4700 and RDAC

Message-ID:

	<0FE1B519D219B64A87E99E362023854505171CDB6F at svr-e2k7.ag-it.com>

Content-Type: text/plain; charset="us-ascii"

Hi all,

I have problem with my servers. I use two of HP Blade Servers and RHEL 4.6 

installed on them, and have IBM DS4700 connected to them.

In those servers are running RHCS (Red Hat Cluster Suite) with GFS for handling 

Oracle Database.

Yesterday, I had missing one partition from the storage, suddenly. I called IBM 

and they suggested to use RDAC.

The question is, Why should use IBM RDAC for multipath in my RHEL 4, and why HP 

Blade + HP EVA Storage don't use any addition plugins software to keep server + 

storage connection?

I will appreciate For some reasons by all of you. 

Thank you.

Regards,

Wahyu

------------------------------

Message: 2

Date: Tue, 20 Jul 2010 16:07:05 +0700

From: Wahyu Darmawan <Wahyu.Darmawan at ag-it.com>

To: General Red Hat Linux discussion list <redhat-list at redhat.com>

Subject: RE: IBM DS4700 and RDAC

Message-ID:

	<0FE1B519D219B64A87E99E362023854505171CDD6D at svr-e2k7.ag-it.com>

Content-Type: text/plain; charset="us-ascii"

Hi all,

Any update?

Thank you.

-----Original Message-----

From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com] On 

Behalf Of Wahyu Darmawan

Sent: Tuesday, July 20, 2010 10:06 AM

To: General Red Hat Linux discussion list

Subject: IBM DS4700 and RDAC

Hi all,

I have problem with my servers. I use two of HP Blade Servers and RHEL 4.6 

installed on them, and have IBM DS4700 connected to them.

In those servers are running RHCS (Red Hat Cluster Suite) with GFS for handling 

Oracle Database.

Yesterday, I had missing one partition from the storage, suddenly. I called IBM 

and they suggested to use RDAC.

The question is, Why should use IBM RDAC for multipath in my RHEL 4, and why HP 

Blade + HP EVA Storage don't use any addition plugins software to keep server + 

storage connection?

I will appreciate For some reasons by all of you. 

Thank you.

Regards,

Wahyu

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------------------------------

Message: 3

Date: Tue, 20 Jul 2010 06:09:19 -0500

From: "Marti, Robert" <RJM002 at shsu.edu>

To: General Red Hat Linux discussion list <redhat-list at redhat.com>

Subject: Re: IBM DS4700 and RDAC

Message-ID: <FA1A205F-342F-4F94-960A-60EDEE82FDBB at shsu.edu>

Content-Type: text/plain; charset="us-ascii"

I would bet that it's simply the support guys are trained on RDAC and  

not trained on multipath.

Sent from my iPhone

On Jul 19, 2010, at 23:33, "Wahyu Darmawan" <Wahyu.Darmawan at ag-it.com>  

wrote:

> Hi all,

>

> I have problem with my servers. I use two of HP Blade Servers and  

> RHEL 4.6 installed on them, and have IBM DS4700 connected to them.

> In those servers are running RHCS (Red Hat Cluster Suite) with GFS  

> for handling Oracle Database.

> Yesterday, I had missing one partition from the storage, suddenly. I  

> called IBM and they suggested to use RDAC.

> The question is, Why should use IBM RDAC for multipath in my RHEL 4,  

> and why HP Blade + HP EVA Storage don't use any addition plugins  

> software to keep server + storage connection?

> I will appreciate For some reasons by all of you.

> Thank you.

>

>

> Regards,

> Wahyu

>

> -- 

> redhat-list mailing list

> unsubscribe mailto:redhat-list-request at redhat.com?subject=unsubscribe

> https://www.redhat.com/mailman/listinfo/redhat-list

------------------------------

Message: 4

Date: Tue, 20 Jul 2010 13:17:14 +0200

From: Georgios Magklaras <georgios at biotek.uio.no>

To: General Red Hat Linux discussion list <redhat-list at redhat.com>

Subject: Re: IBM DS4700 and RDAC

Message-ID: <4C4585BA.6030402 at biotek.uio.no>

Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 07/20/2010 05:06 AM, Wahyu Darmawan wrote:

> Hi all,

>

> I have problem with my servers. I use two of HP Blade Servers and RHEL 4.6 

installed on them, and have IBM DS4700 connected to them.

> In those servers are running RHCS (Red Hat Cluster Suite) with GFS for 

handling Oracle Database.

> Yesterday, I had missing one partition from the storage, suddenly. I called 

IBM and they suggested to use RDAC.

> The question is, Why should use IBM RDAC for multipath in my RHEL 4, and why 

HP Blade + HP EVA Storage don't use any addition plugins software to keep server 

+ storage connection?

> I will appreciate For some reasons by all of you.

> Thank you.

>

>

> Regards,

> Wahyu

>

>    

This is a classic. RDAC is the standard supported way to perform 

multi-path software config for IBM DS devices. In addition, it provides 

some troubleshooting features that are not included in other software 

suites (such as the HP tools). So, what they will do is to look at the 

'SMdevices' command and verify the status of the RDAC software that 

talks to your DS4700 unit. The HP Blade + EVA is concerned with lights 

out and HP specific things.

When I had to deal with a similar case, IBM insisted that it is part of 

the support deal to install this software. It is not really a big thing 

to install it. If they won't help you with installation give us a shout.

-- 

Best regards,

--

George Magklaras BSc (Hons) MPhil RHCE

IT Systems Manager/Senior Systems Engineer

The Biotechnology Center of Oslo

University of Oslo

http://www.biotek.uio.no

http://www.no.embnet.org

http://folk.uio.no/georgios

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End of redhat-list Digest, Vol 77, Issue 18

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