Date: Fri, 20 Apr 2007 23:40:50 +0100 (BST) From: Mike Wolman <mike@nux.co.uk> To: roberto@keltia.freenix.fr, freebsd-fs@freebsd.org Subject: lazy mirror / live backup Message-ID: <20070420232209.G4559@nux.eros.office>
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>> I'd like the ability to have gmirror do a more efficient re-silvering (or >> re-syncing) of the mirror members when a planned disconnect occurs. This >> would significantly reduce the mirror rebuild time for any component which >> had been deactivated, for network mirrors using ggated devices this would >> also reduce network usage and could be used for remote asynced mirrors >> thus providing a live backup for laptops/workstations. >Do you see that you are describing ZFS there? Considering the status of >ZFS right now, I think it is not worth really trying to implement such >scheme in gmirror. The problem with zfs is you cannot layer it as u can with the geom classes. For example if you want to create a failover zfs storage pool, if you make the zfs pool out of gmirror devices with one being a local device and the other being a ggatec device. You would then have your zfs raidz pool replicated on a remote host. I do not think you can do this with zfs by itself as you are not able to layer raidz pool ontop of a load of zfs mirrors. Mike.
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