From mboxrd@z Thu Jan 1 00:00:00 1970 From: dima Subject: Re: Set nodatacow per file? Date: Mon, 13 Feb 2012 16:40:03 +0900 Message-ID: <4F38BE53.4080204@parallels.com> References: <4F38B8F0.5020506@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed To: Return-path: In-Reply-To: <4F38B8F0.5020506@yahoo.com> List-ID: Hello Ralf-Peter, Actually it is possible. Check out David's response to my question from some time ago: http://permalink.gmane.org/gmane.comp.file-systems.btrfs/14227 The nocow.c script he attached does just the thing you want. The script is really working. I needed nocow for different purpose but it did not occur to me to try it on VM image and see if the performance would improve. Sounds like a great idea. If you get around to try it, pls. post your impressions here. best ~dima 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. > > Thanks, > Ralf-Peter > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html