On Mon, Feb 27, 2012 at 7:54 AM, dima <dole...@parallels.com> wrote: > Hello, > > Since several people asked to post the results, here they are. > I tried raw virtio disk with and without -z -C set and also qcow2 virtio > disk without -z -C set and did not notice any difference in performance at > all - Redhat 6.2 Minimal installs in 10 minutes in each case. The "abysmal" > performance as it was some several months ago (like 10 minutes just for > virtual disk formatting) under the same conditions is no more at least on > 3.3.0-rc5.
Just to make sure, this is a _new_ virtual disk right? I can barely contain my excitement right now. This is amazing progress. > > best > ~dima > > > > On 02/24/2012 02:22 PM, dima wrote: >> >> On 02/13/2012 04:17 PM, Ralf-Peter Rohbeck wrote: >>> >>> Hello, >>> is it possible to set nodatacow on a per-file basis? I couldn't find >>> anything. >>> If not, wouldn't that be a great feature to get around the performance >>> issues with VM and database storage? Of course cloning should still >>> cause COW. >> >> >> Hello, >> Going back to the original question from Ralf I wanted to share my >> experience. >> >> Yesterday I set up KVM+qemu and set -z -C with David's 'fileflags' >> utility for the VM image file. >> I was very pleased with results - Redhat 6 Minimal installation was >> installed in 10 minutes whereas it was taking 'forever' the last time I >> tried it some 4 months ago. Writes during installation were very >> moderate. Performance of VM is excellent. Installing some big packages >> with yum inside VM goes very quickly with the speed indistinguishable >> from that of bare metal installs. >> >> I am not quite sure should this improvement be attributed to the nocow >> and nocompress flags or to the overall improvement of btrfs (I am on >> 3.3-rc4 kernel) but KVM is definitely more than usable on btrfs now. >> >> I am yet to test the install speed and performance without those flags >> set. >> >> best >> ~dima >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >> the body of a message to majord...@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
