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Re: [Linux-cluster] any timeline for supporting software RAID?



On Thu, 2008-01-24 at 10:12 -0500, Lon H. Hohberger wrote:
> On Wed, 2008-01-23 at 21:28 -0500, Jeff Wasilko wrote:
> 
> > Yup, we have a SAN. 
> > 
> > > With software RAID (or plain LVM), the general rule is:
> > > 
> > > Do not use a md set or LVM volume group on shared storage *unless* only
> > > one node ever assembles that volume-group / raid-set at a time.
> > 
> > Which would be the case when LUNs were being failed over from node
> > to node in an active-passive environment.
> > 
> > The docs all seem to flatly state that mirroring and cluster aren't supported.
> > Is this something that redhat's support organization is willing to support
> > at this point?
> 
> http://sources.redhat.com/cgi-bin/cvsweb.cgi/cluster/rgmanager/src/resources/lvm.sh?rev=1.1.2.7&content-type=text/x-cvsweb-markup&cvsroot=cluster&only_with_tag=RHEL46
> 
> Big link ;)
> 
> Ok, so...
> 
>   <lvm name="myLV" vg_name="VolGroup01" lv_name="LogVol01"/>
> 
> This looks like an earlier version of the agent, which only supports one
> LV per VG at a time.
> 
> I've asked the author to write a wiki page on it... My knowledge of it
> is pretty cursory.

I've started this:

http://sources.redhat.com/cluster/wiki/LVMFailover

It's nothing more than I've told you so far, but it's a start.

-- Lon



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