[CentOS-virt] IBM GPFS filesystem

carlopmart carlopmart at gmail.com
Thu Dec 2 19:47:10 EST 2010

On 12/02/2010 10:53 PM, Benjamin Franz wrote:
> On 12/02/2010 12:58 PM, compdoc wrote:
>> [>]...live migration...?
>> _______________________________________________
>> Interesting. Does live migration not work on ext3 or ext4?
> No. You need a shared filesystem.

Thats not true. You can do live kvm guest migration using RHEL/CentOS+RHCS+KVM using 
lvm volumes to allocate/install kvm guests, for example. In this case you don't need 
a shared filesystem ...

To accomplish a live kvm migration (or xen) you need a shared storage, not a 
clustered filesystem or shared filesystem.

  Which pretty much leaves you on either
> NFS or a clustered filesystem. RH has an example of using NFS - with a
> strong statement attached that you shouldn't do it that way in real life
> because the performance is poor.

I have two solaris zfs/nfs fileservers sharing storage to 5 ESXi servers and 
performance is very very good ... And it is a production system ...

> Trying to mount ext3 or ext4 simultaneously from two machines (on say
> iSCSI) would just result in filesystem corruption.

This case isn't possible, because you can't mount an ext3 or ext4 filesystem at the 
same time in two or more hosts ...


CL Martinez
carlopmart {at} gmail {d0t} com

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