[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-users] very slow disk access

On Feb 26, 2011, at 6:25 PM, Brian Krusic wrote:

On Feb 26, 2011, at 6:11 PM, Randy Katz wrote:

it seems I am using tap:aio on what appears to be quite slow:

disk = [ "tap:aio:/disk0/server3.img,xvda,w" ]

Is there a good way to convert from tap:aio to lvm?

Hi Randy,

I don't use LVM and my performance is fine.

Have you looked into the domU itself troubleshooting as if it were a non virtual host?

Things like vmstat, top, tcpdump, dstat, etc... just to get a snapshot of what your system is doing.

Apply the same approach to dom0 as well.

I've used both fixed and non fixed disk images w/o issue.

My env is Centos using the bundled version of Xen as well as Gitcos latest 3.X versions.

And my opinion is to keep your domU isolated and not have it use an fs that the dom0 can see (minus NFS, etc...), treating your domU as a real machine with the advantages of being virtualized.

- Brian

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.