Date: Thu, 08 Apr 1999 21:41:19 -0500 From: Chris Csanady <cc@137.org> To: Duncan Barclay <dmlb@ragnet.demon.co.uk> Cc: Alfred Perlstein <bright@rush.net>, hackers@FreeBSD.ORG, Peter Jeremy <peter.jeremy@auss2.alcatel.com.au> Subject: Re: Volume managers Message-ID: <19990409024119.83B86AC@friley-185-205.res.iastate.edu> In-Reply-To: Your message of "Thu, 08 Apr 1999 20:33:57 BST." <XFMail.990408203357.dmlb@computer.my.domain>
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> >On Thu, 8 Apr 1999, Peter Jeremy wrote: > >> Whilst we're all making up wishlists for things we'd like to see >> (someone else implement): The `clone filesystem' command supported by >> Digital UNIX ADVfs is _very_ nice for `point-in-time' backups. >> (Basically clonefset makes a read-only snapshot of the filesystem - >> changes to the `active' filesystem are done using copy-on-write). >> >> Unfortunately, I suspect it couldn't be implemented within UFS >> (because UFS relies on blocks being at particular physical locations >> within a CG - ie superblock, array of inode blocks, data blocks - >> which would make creating the copy-on-write blocks difficult). > >Well NetApps file system does a similar thing and it is based on UFS. >The main trick they use is similar to that described in I thought that NetApp now uses a log structured file system. This inherently makes growing/shrinking filesystems and snapshots very easy. It would be great to have a good lfs implementation. Chris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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