On Wed, Aug 12, 2009 at 2:15 PM, Mike Gerdts<mger...@gmail.com> wrote: > On Wed, Aug 12, 2009 at 11:53 AM, Damjan > Perenic<damjan.pere...@guest.arnes.si> wrote: >> On Tue, Aug 11, 2009 at 11:04 PM, Richard >> Elling<richard.ell...@gmail.com> wrote: >>> On Aug 11, 2009, at 7:39 AM, Ed Spencer wrote: >>> >>>> I suspect that if we 'rsync' one of these filesystems to a second >>>> server/pool that we would also see a performance increase equal to what >>>> we see on the development server. (I don't know how zfs send a receive >>>> work so I don't know if it would address this "Filesystem Entropy" or >>>> specifically reorganize the files and directories). However, when we >>>> created a testfs filesystem in the zfs pool on the production server, >>>> and copied data to it, we saw the same performance as the other >>>> filesystems, in the same pool. >>> >>> Directory walkers, like NetBackup or rsync, will not scale well as >>> the number of files increases. It doesn't matter what file system you >>> use, the scalability will look more-or-less similar. For millions of files, >>> ZFS send/receive works much better. More details are in my paper. >> >> It would be nice if ZFS had something similar to VxFS File Change Log. >> This feature is very useful for incremental backups and other >> directory walkers, providing they support FCL. > > I think this tangent deserves its own thread. :) > > To save a trip to google... > > http://sfdoccentral.symantec.com/sf/5.0MP3/linux/manpages/vxfs/man1m/fcladm.html > > This functionality would come in very handy. It would seem that it > isn't too big of a deal to identify the files that changed, as this > type of data is already presented via "zpool status -v" when > corruption is detected. > > http://docs.sun.com/app/docs/doc/819-5461/gbctx?a=view
In fact ZFS has a good transaction log, maybe the issue is there isn't software out there yet that uses it. -Ross _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
