[linux-lvm] clusteredVG+mirroredLV

[Lin_ChiiShing at emc.com]

I am using source with cvs tag RHEL4U4, and was able to go into
cmirror-kernel directory to build the module dm-cmirror.ko

After loading dm_cmirror module, the system-config-lvm tool
configured a mirrored LV in a clustered VG successfully.

Can someone in RedHat shed light on what's the current status of source
for cmirror-kernel and clustered mirroring? 
What's expected to work (such as normal IO), and
what's expected not to work yet ? For early bird developers who are interested in 
using this technology, do you have a recommended CVS tag for the source to do the prototype ? 

    Thanks,
    -ChiiSHing


-----Original Message-----
Date: Wed, 25 Apr 2007 10:29:52 +0200
From: Michael Eisenk?lbl <eisenkoe at cargo-partner.com>
Subject: Re: [linux-lvm] clusteredVG+mirroredLV
To: LVM general discussion and development <linux-lvm at redhat.com>
Message-ID: <462F1180.1010602 at cargo-partner.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Do you know when it will be released?
Will it work with with RHEL 5?

Jayson Vantuyl wrote:
> Mirroring (and snapshotting) does not currently work with clustered 
> VGs.  This is because cmirror (and csnap) is not released yet.
>
> On Apr 25, 2007, at 2:48 AM, Michael Eisenkölbl wrote:
>
>> Hi all,
>>
>> i want to create a two node cluster with three iSCSI devices.
>> the iSCSI devices should be mirrored (2mirror+1log) to be more secure.
>> I am going to configure 3 PVs and after a clustered volume group, so 
>> this is no problem.
>> but when I am trying to create the mirrored logical volume (on this 
>> clusteredVG), I got the following error message:
>>
>> lvcreate command failed.
>> Command attempted: "/usr/sbin/lvcreate -n mirrorLV -l 6 -m1 mirrorVG 
>> /dev/sde1 /dev/sdb1 /dev/sdc1" - System Error Message:   Error 
>> locking on node server4: Internal lvm error, check syslog
>> Aborting. Failed to activate mirror log. Remove new LVs and retry.
>> Failed to create mirror log.
>>
>> I deleted everything and retried it, but everytime the same error.
>> cluster is working good. clvmd is also started with locking mode 2.
>> if I try to create a normal VG with a mirrored LV everythings fine.
>> if I try to create a clustered VG with a normal LV everythings fine.
>> but not a clustered VG with a mirrored LV...... why?
>>
>> maybe somebody can help me with this situation.
>>
>> kind regards
>> Michael
>>
>> _______________________________________________
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>> linux-lvm at redhat.com <mailto:linux-lvm at redhat.com>
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>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>
>
> -- 
> Jayson Vantuyl
> Systems Architect
> *Engine Yard <http://www.engineyard.com>*
> jvantuyl at engineyard.com <mailto:jvantuyl at engineyard.com>
>
>
> ------------------------------------------------------------------------
>
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