> Apologies in advance for the newbie internals question, but could > someone please give me a pointer to how ZFS snapshots cause future > modifications to files to be written to different disk blocks? I'm > looking at OpenSolaris NV bld 66.
"snapshots" don't really cause that. ZFS never overwrites data, so all writes are to "different" disk blocks. Data in a file is never overwritten directly. Once this is true, then the creation of snapshots is easier, but the two are separate. > How do snapshots interact with open files or files with pages in the > OpenSolaris page cache? I don't believe they do. Are you thinking of something in particular? > My general understanding is that ZFS always writes to new locations > (which makes snapshot simple), but does that apply to data pages too? All data and metadata (except for the uberblock dance). > Does that mean that paging out dirty mmap pages go to new places and > require metadata updates as well? Yes. -- Darren Dunham [EMAIL PROTECTED] Senior Technical Consultant TAOS http://www.taos.com/ Got some Dr Pepper? San Francisco, CA bay area < This line left intentionally blank to confuse you. > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
