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Date: Mon, 16 Jan 2012 18:03:07 +0100 From: Asdo <asdo@...ftmail.org> To: Amir Goldstein <amir73il@...il.com> Cc: linux-ext4@...r.kernel.org Subject: Re: Filesystem freeze vs blockdevice snapshot [sorry for double posting : had forgot to remove html] Thanks but it's still not clear to me. What do you mean with "clean fs"? is that in any way different from an image after a sudden power loss? Secondarily, how can LVM know what filesystem is underneath and call the proper freeze? That's a bare block device, there might not even be a filesystem under LVM; or it might be exported via iSCSI to an XYZ operating system using the Xyzfs filesystem which Linux knows nothing about... Thank you On 01/14/12 19:33, Amir Goldstein wrote: > LVM2 already does the fs freeze for you before taking the snapshot. > it's the only way to get a block device snapshot of a "clean" fs. > hope that answers your question. > > On Fri, Jan 13, 2012 at 5:30 PM, Asdo <asdo@...ftmail.org > <mailto:asdo@...ftmail.org>> wrote: > > Hello all, > please excuse the silly question... > > What is the benefit of performing an ext4 fs freeze before taking > a snapshot of the underlying block device with LVM2 ? > > Is the freeze step useful or I can go with the snapshot directly? > > And/or is there another use case for the freeze? > > Thank you > -- > To unsubscribe from this list: send the line "unsubscribe > linux-ext4" in > the body of a message to majordomo@...r.kernel.org > <mailto:majordomo@...r.kernel.org> > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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