From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32]) by int-mx1.corp.redhat.com (8.12.11.20060308/8.12.11) with ESMTP id k87ICGFB000468 for ; Thu, 7 Sep 2006 14:12:16 -0400 Received: from wx-out-0506.google.com (wx-out-0506.google.com [66.249.82.236]) by mx3.redhat.com (8.13.1/8.13.1) with ESMTP id k87IBxXW007557 for ; Thu, 7 Sep 2006 14:11:59 -0400 Received: by wx-out-0506.google.com with SMTP id i30so465948wxd for ; Thu, 07 Sep 2006 11:11:59 -0700 (PDT) Message-ID: Date: Thu, 7 Sep 2006 14:11:58 -0400 From: "Boris Ostrovsky" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_154448_7645313.1157652718983" Subject: [linux-lvm] CLVM vs LVM Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: linux-lvm@redhat.com ------=_Part_154448_7645313.1157652718983 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline (This was somewhat covered in another thread, but I am still not clear, so I'll ask again) I have a number of nodes that all have access to a set of LUNs. The nodes are managed by a dedicated management workstation that can talk to each node and ask it to execute LVM commands. The workstation will assure that at any given moment only one node is modifying LVM configuration (i.e.. creating/deleting/modifying/etc a PV, VG or LV) and that only one node is mounting a filesystem that resides on a particular LV. My question is whether I need to have clvmd and, if yes, whether I have to to provide some additional locking (and perhaps something else). My very simple experiments without clvmd seem to suggest that I may not need it, but of course the fact that the setup worked for me in doesn't prove anything. (I did try using CMAN/GLM, but I would like to avoid having to deal with another package, if possible.) It is possible that I need to specify something in the configure script. --with-cluster and --with-clvmd seem to be particularly relevant, but I don't really understand what the options are. Any help will be greatly appreciated. Thanks. -boris ------=_Part_154448_7645313.1157652718983 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline (This was somewhat covered in another thread, but I am still not clear,
so I'll ask again)

I have a number of nodes that all have access to a set of LUNs. The
nodes are managed by a dedicated management workstation that can talk
to each node and ask it to execute LVM commands. The workstation will
assure that at any given moment only one node is modifying LVM
configuration (i.e.. creating/deleting/modifying/etc a PV, VG or LV)
and that only one node is mounting a filesystem that resides on a
particular LV.

My question is whether I need to have clvmd and, if yes, whether I
have to to provide some additional locking (and perhaps something
else). My very simple experiments without clvmd seem to suggest that I
may not need it, but of course the fact that the setup worked for me
in doesn't prove anything. (I did try using CMAN/GLM, but I would like
to avoid having to deal with another package, if possible.)

It is possible that I need to specify something in the configure script.
--with-cluster and --with-clvmd seem to be particularly relevant, but I don't
really understand what the options are.

Any help will be greatly appreciated.


Thanks.
-boris
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