Re: [Xen-users] Sharing Disk Access Time

[Hans de Bruin <jmdebruin@xxxxxxxxx>]

On 12/15/2010 05:26 PM, Russ Purinton wrote:
> I’m guessing Yes based on this:
>
> [root@xen1 ~]# cat /etc/modprobe.conf | grep scsi_hostadapter
...
> I notice that whenever I build a new VM and it gets to where it is
> allocating the img file, the entire time it is allocating the space for
> it, all my other virtual machines effectly stop doing anything.

This is not only an issue on xen but also on kvm. I have seen big 
differrences in between installing windows vm's on ext4 and installing 
on bare lvm volumes. file-space allocation on ext4 is very expensive. 
because of this I only use vm's on bare lvm's. Stacking two 
transactional filesystems (nfts on ext3/4 or ext3/4 on ext3/4) seems a 
bad idea to me anyway.
--
Hans

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