> > As the xfs performance comes back about twice the performance of ext3 > for this test I am of the opinion that xfs must be cheating somehow. It > has always been my opinion that the IO bottleneck is the hardware and > not the filesystem hence changing the filesystem but using the same > hardware should not make a huge difference to performance (you still > have to get the same amount of data out to disk at the end of the day) > > I am struggling to comprehend how xfs can cheat, though, as it can't > cache such a huge file as there is not enough memory. Is it perhaps > cheating because the file is comprised entirely of zero's? > > Can someone please enlighten me Try mounting your ext3 file system with the "data=writeback" option. See mount(8). David S. > > Thanks in advance > > Gary Mansell > -- > > This e-mail and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. > If you have received this e-mail in error please notify the sender immediately > and delete this e-mail from your system. Please note that any views or opinions > presented in this e-mail are solely those of the author and do not necessarily > represent those of Ricardo (save for reports and other documentation formally > approved and signed for release to the intended recipient). Only Directors > or Duly Authorised Officers are authorised to enter into legally binding > obligations on behalf of Ricardo unless the obligation is contained within > a Ricardo Purchase Order. > > Ricardo may monitor outgoing and incoming e-mails and other telecommunications > on its e-mail and telecommunications systems. By replying to this e-mail you > give consent to such monitoring. The recipient should check this e-mail and > any attachments for the presence of viruses. Ricardo accepts no liability for > any damage caused by any virus transmitted by this e-mail. "Ricardo" means > Ricardo plc and its subsidiary companies. > > Ricardo plc is a public limited company registered in England with registered > number 00222915. > The registered office of Ricardo plc is Bridge Works, Shoreham-by Sea, > West Sussex, BN43 5FG. > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
