[linux-lvm] Is my xen hosting tech support misleading me?

[Tim Post]

On Tue, 2009-02-03 at 09:02 +0200, Shachar Or wrote:
> Hello.
> 
> Attached is a question I've asked my xen hosting provider's technical
> support and the answer they've supplied.
> 
> Sam sais "There is no LVM module available, so you would need to compile
> LVM by yourself from the Xen kernel sources." but I've no problem
> loading dm_mod and to my understanding of LVM, this is the only module
> needed. So is he just wrong?

Probably, however your going to need to find out if you have the entire
dm_* family for the functionality that you want (i.e. snapshots). You
should (on your VM) simply be able to install lvm2 via yum, apt-get or
whatever packaging mechanism is provided by your distribution.

I use lvm2 on literally hundreds of paravirtualized Xen guests without a
problem.

A word of warning, don't make LV's (or their snapshots) a prerequisite
to boot .. since you have no control over your initrd. If your provider
has given you xvda and xvdb , use xvdb for your pv, keep the root file
system on xvda. 

Cheers,
--Tim


> 
> Thanks.
> email message attachment, "הודעה מועברת - <Ref1876314> DOMAIN :"
> > -------- Forwarded Message --------
> > From: Gandi Hosting <hosting at support.gandi.net>
> > To: dawnlight at lavabit.com
> > Subject: <Ref1876314> DOMAIN :
> > Date: Mon, 2 Feb 2009 15:09:28 +0100 (CET)
> > 
> > Hello, 
> > 
> > Thank you for your patience.
> > 
> > There is no LVM module available, so you would need to compile LVM
> > by yourself from the Xen kernel sources. 
> > 
> > You will then need to activate the module. 
> > 
> > You should be able to find the appropriate help online.
> > 
> > 
> > I am at your disposal should you need any further information.
> > 
> > Best regards,
> > Sam
> > 
> > ---------------------------------------
> > Are you satisfied with the quality of the reply you received?
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> > 
> > I would like to give more detailed feedback:
> > http://www.gandi.net/faq/feedback
> > ---------------------------------------
> > 
> > 
> > 
> > Help about hosting / aide sur l'hébergement: http://wiki.gandi.net/
> > 
> > GANDI
> > http://www.gandi.net 
> > 
> > 
> > -------------------------------------- 
> > Product     : hosting 
> > Category    :  
> > Question    :  
> > FirstName   : Shachar 
> > LastName    : Or 
> > CompanyName :  
> > Email       : dawnlight at lavabit.com 
> > Domain      :  
> > DomainNB    :  
> > Handle      : SO866-GANDI 
> > Anciennet  :  
> > Transaction :  
> > Message     : Hello. 
> > 
> > This is a technical question about a problem I'm experiencing with LVM on my virtual server. 
> > 
> > The issue is that logical volumes are not activated on bootup. This prevents me from using /etc/fstab to mount them. 
> > 
> > root at shacharor:~# lvdisplay | grep 'LV Status' && udevtrigger && udevsettle && lvdisplay | grep 'LV Status' 
> >   LV Status              NOT available 
> >   LV Status              available 
> > root at shacharor:~# 
> > 
> > This shows that udev handles logical volumes correctly and does activate them. But why doesn't it do it on bootup? 
> > 
> > Thanks. 
> > 
> > 
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