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RE: AW: [Xen-users] Best way to use iSCSI in domU

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Angel L. Mateo" <amateo@xxxxx>
  • Date: Mon, 22 Jun 2009 12:05:40 +0200
  • Delivery-date: Mon, 22 Jun 2009 03:06:23 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

El lun, 22-06-2009 a las 00:32 -0700, Nathan Eisenberg escribiÃ:
> Interesting.  I'd stand back and look at your existing setup before trying to 
> rebuild with some other storage tech.
> In my experience, poor NFS performance is almost always due to 
> misconfigurations (not your fault - NFS is suprisingly low level and can be 
> very confusing at times).  I have several very large NFS deployments that 
> have absolutely fantastic performance.  NFS is probably already a proven 
> technology for whatever you're doing.
> The number one thing to do is ensure that you have NFS mounted without the 
> synchronization option turned on.  There's also buffer sizes to be calculated 
> and set.  If these are web servers, there is also an Apache directive 
> regarding kernel caching of files; essentially, you can end up double caching 
> files without the directive in place.
        We've done a lot of tests and checks. NFS performance is poor for what
we need in this particular case (we are using it in other scenarios
without any problem).

Angel L. Mateo MartÃnez
SecciÃn de TelemÃtica
Ãrea de TecnologÃas de la InformaciÃn       _o)
y las Comunicaciones Aplicadas (ATICA)      / \\
http://www.um.es/atica                    _(___V
Tfo: 868887590
Fax: 868888337

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