Re: [Xen-users] Xen and iSCSI

[Arnd Schmitter <arnd_xen@xxxxxxxx>]

Markus Hochholdinger wrote:
> Hi,
>
> Am Sonntag, 29. Januar 2006 13:06 schrieb Pasi Kärkkäinen:
> [..]
>   
> > So you have used SAN+CLVM with Xen ?
> > Is CLVM considered stable? Have you had problems with it?
> > And also it would be nice to know what version of the distribution, kernel,
> > clvm and xen you have been using..
> > I'm going to try CLVM in couple of weeks, and it would be nice to know
> > other people's thoughts about it.
> >     
> as far as i read the docs clvm is a part on top of lvm2. But i don't really 
> see what's the benefit of clvm? It must be that clvm is able to work on top 
> of shared storage (like iscsi, gnbd, ..) from different hosts? Means that 
> multiple clvm on different hosts use the same block devices and clvm manages 
> that nothing bad happens (write from two lokations to the same block device 
> (partition) are managed).
> But if anyone knows for real, let us know?
>   
During the last few days. I've started to experiment with GNBD and CLVM. 
CLVM is usefull for the situation, where you've exported a VG to more 
than one host and want to modify it (create a LV). Without CLVM, the 
other host wont know the change until it is told to resync (via vgchange).
Without CLVM you've to umount all LV on the other hosts and than make a 
chance. After that, the other have to update their LVM (vgchange) and 
remount their LV. For changes in bigger running system. This would be a 
overkill.
Greets Arnd

        

        
                
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