Hi Igor,

We will do eventually this test and let you know. This question was raised 
during a meeting by one of our senior sysadmin and I believe at this point that 
the answer is defineitively a yes. We like what we see and read so far about 
ceph. The client has no choice( du to the growing nature and the structure of 
our data) to move to an object storage like ceph instead of the traditional 
san/nas storage plattform we cureently have. We will be in touch,

Thank you
Yao Mensah

From: Igor Laskovy [mailto:igor.lask...@gmail.com]
Sent: Friday, May 24, 2013 3:09 AM
To: Mensah, Yao (CIV)
Cc: Dave Spano; ceph-users@lists.ceph.com
Subject: Re: [ceph-users] FW: About RBD

Hi Mensah,

as already mentioned Gregory, you can use RBD at same time from both servers - 
Microsoft CSV should be run well.
I don't make any test for CSV yet, so can you please try and do quick response 
about that?

On Thu, May 23, 2013 at 8:40 PM, Mensah, Yao (CIV) 
<yao.men...@usdoj.gov<mailto:yao.men...@usdoj.gov>> wrote:
Thank you very much for your prompt response...

So basically I can't use cluster aware tool like Microsoft CSV on the RBD, is 
that correct?

What I am trying to understand is that can I have 2 physical hosts (Maybe Dell 
PowerEdge2950)

*host1 with VM#0-10
*host2 with  VM #10-20

And both of these hosts accessing one big LUN or, in this case ceph RBD?

Can host1 failed all it VMs to host2 in case that machine has trouble and still 
make it resources available to my users? This is very important to us if we 
really want to explore this new avenue of Ceph

Thank you,

Yao Mensah
Systems Administrator II
OLS Servers
yao.men...@usdoj.gov<mailto:yao.men...@usdoj.gov>
(202) 307 0354<tel:%28202%29%20307%200354>
MCITP
MCSE NT4.0 / 2000-2003
A+

From: Dave Spano [mailto:dsp...@optogenics.com<mailto:dsp...@optogenics.com>]
Sent: Thursday, May 23, 2013 1:19 PM
To: Mensah, Yao (CIV)
Cc: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>
Subject: Re: [ceph-users] FW: About RBD

Unless something changed, each RBD needs to be attached to 1 host at a time 
like an ISCSI lun.
Dave Spano
Optogenics

________________________________
From: "Yao Mensah (CIV)" <yao.men...@usdoj.gov<mailto:yao.men...@usdoj.gov>>
To: ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com>
Sent: Thursday, May 23, 2013 1:10:53 PM
Subject: [ceph-users] FW: About RBD
FYI

From: Mensah, Yao (CIV)
Sent: Wednesday, May 22, 2013 5:59 PM
To: 'i...@inktank.com<mailto:i...@inktank.com>'
Subject: About RBD

Hello,

I was doing some reading on your web site about ceph and what it capable of. I 
have one question and maybe you can help on this:

Can ceph RBD be used by 2 physical hosts at the same time? Or, is Ceph rbd 
CSV(Clustered Shared Volumes) aware?

Thank you,

Yao Mensah
Systems Administrator II
OLS Servers


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