Rainer, If you are looking for a means to safely "READ" any filesystem, please take a look at Availability Suite.
One can safely take Point-in-Time copies of any Solaris supported filesystem, including ZFS, at any snapshot interval of one's choosing, and then access the shadow volume on any system within the SAN, be it Fibre Channel or iSCSI. If the node wanting access to the data is distant, Available Suite also offers Remote Replication. http://www.opensolaris.org/os/project/avs/ http://www.opensolaris.org/os/project/iscsitgt/ Jim > Ronald, > > thanks for your comments. > > I was thinking about this scenario: > > Host w continuously has a UFS mounted with read/write access. > Host w writes to the file f/ff/fff. > Host w ceases to touch anything under f. > Three hours later, host r mounts the file system read-only, > reads f/ff/fff, and unmounts the file system. > > My assumption was: > > a1) This scenario won't hurt w, > a2) this scenario won't damage the data on the file system, > a3) this scenario won't hurt r, and > a4) the read operation will succeed, > > even if w continues with arbitrary I/O, except that it doesn't > touch anything under f until after r has unmounted the file system. > > Of course everything that you and Tim and Casper said is true, > but I'm still inclined to try that scenario. > > Rainer > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss Jim Dunham Solaris, Storage Software Group Sun Microsystems, Inc. 1617 Southwood Drive Nashua, NH 03063 Email: [EMAIL PROTECTED] http://blogs.sun.com/avs _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
