Kevin McKeon
2009-Mar-27 16:49 UTC
[Xen-users] Performance difference between a "partition image file" and a compressed file system
Does anyone know how significant the performance hit is when using a partition image file for the file system of a domU instance as opposed to using a file system on a separate disk? For example: disk =[''tap:aio:/xen/images/mydomU_partition.img,xvda1,w''] *vs* disk =[''phy:hda1,xvda1,w''] I realize the second config would be faster, but will the first one work pretty well? Does anyone know of any performance papers written on this subject? Cheers, Kevin _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Ferreira, N. L. (Nuno)
2009-Mar-27 20:15 UTC
Re: [Xen-users] Performance difference between a "partition image file" and a compressed file system
Hi Kevin I do not have numbers, but the partition based option should have a better performance. You can try yourself that, running a benchmark like bonnie++ inside your image file domU as well as inside your partition based domU. Then, you will have numbers to share with us ;-) Cheers, N Kevin McKeon wrote:> Does anyone know how significant the performance hit is when using a > partition image file for the file system of a domU instance as opposed > to using a file system on a separate disk? > > For example: > > disk =[''tap:aio:/xen/images/mydomU_partition.img,xvda1,w''] > *vs* > disk =[''phy:hda1,xvda1,w''] > > I realize the second config would be faster, but will the first one > work pretty well? Does anyone know of any performance papers written > on this subject? > > Cheers, > Kevin > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users-- =============================================Nuno Ricardo Santos Loureiro da Silva Ferreira NMR Spectroscopy Research Group Bijvoet Center for Biomolecular Research Utrecht University Bloembergen gebouw Padualaan 8, 3584 CH Utrecht The Netherlands P: +31.(0)30.253 9932 F: +31.(0)30.253 2652 E: n.l.ferreira@uu.nl W: http://nmr.chem.uu.nl ============================================= _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users