Date: Sun, 31 Mar 2002 21:12:13 -0500 From: Garance A Drosihn <drosih@rpi.edu> To: Kirk McKusick <mckusick@beastie.mckusick.com> Cc: arch@FreeBSD.ORG Subject: Re: UFS snapshots in current Message-ID: <p05101501b8cd700e7c76@[128.113.24.47]> In-Reply-To: <200203312214.g2VMEWD07500@beastie.mckusick.com> References: <200203312214.g2VMEWD07500@beastie.mckusick.com>
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At 2:14 PM -0800 3/31/02, Kirk McKusick wrote: >All of the above is basically correct. Your use of a snapshot >over a long period of time and in particular over a CVS update, >build world, and install world should not cause trouble (other >than perhaps a large amount of disk space being used). There >is no problem with rebooting, provided that the filesystem with >the snapshot is cleanly unmounted. I really think this snapshot capability is great. Combined with the huge disks we can buy these days, I think snapshots will be useful in many ways that we're not even thinking of yet. >I fixed one deadlock last January, but am aware of at least >one more that is still there. I have a fairly good idea on how >to fix it, but have not yet had the time to work on that fix. Okay, thanks. >On your final question about making a pax archive, if you make >an archive of the real filesystem, the snapshot will show up >on the archive as a file the size of the filesystem partition. >If you mount the snapshot and then make an archive of that >filesystem, then the snapshot(s) in the archive will show up >as zero length files. Hmm. Is there any way for a regular user-land process to tell if a given file is a snapshot? Something in the stat() info, or some other way to tell? I have no urgent need for it, but it seems like it would be useful. -- Garance Alistair Drosehn = gad@eclipse.acs.rpi.edu Senior Systems Programmer or gad@freebsd.org Rensselaer Polytechnic Institute or drosih@rpi.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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