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Old 07-21-2010, 08:39 AM
 
Default redhat-list Digest, Vol 77, Issue 18

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)










-----Original Message-----
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To: redhat-list <redhat-list@redhat.com>
Sent: Tue, Jul 20, 2010 9:31 pm
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@ag-it.com>

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

Subject: IBM DS4700 and RDAC

Message-ID:

<0FE1B519D219B64A87E99E362023854505171CDB6F@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@ag-it.com>

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

Subject: RE: IBM DS4700 and RDAC

Message-ID:

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

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



Hi all,

Any update?



Thank you.





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

From: redhat-list-bounces@redhat.com [mailto:redhat-list-bounces@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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unsubscribe mailto:redhat-list-request@redhat.com?subject=unsubscribe

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



Message: 3

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

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

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

Subject: Re: IBM DS4700 and RDAC

Message-ID: <FA1A205F-342F-4F94-960A-60EDEE82FDBB@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@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@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@biotek.uio.no>

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

Subject: Re: IBM DS4700 and RDAC

Message-ID: <4C4585BA.6030402@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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