On Mon, Nov 19, 2007 at 07:54:23AM -0700, dan wrote: > yes! i have run it in a test environment on real hardware in nexenta, which > is opensolaris meets ubuntu. > > works very well. be sure to turn on ZFS compression and turn OFF backuppc > compression. ZFS compresses much more efficiently(CPU wise) and I get much > higher transfer rates this way.
My understanding is that ZFS's compression is a much lower compression ratio than the gzip that backuppc uses. Before I settled on this i'd also try gzip -1 (default -3). I think that recent opensolaris builds also allow zlib/gzip compression but i don't follow zfs closely enough to say for sure. be aware that one disadvantage of raidz vs. raid5 is that you lose some of raid5's random read performance. The same optimization that removes the raid5 write hole causes this - since you're writing one application write as one raid-z stripe you have to seek all the disks and read that whole stripe when you read the file again. Of course, it's faster on the relevant writes; probably what you want to optimize for. > > Has anybody tried BackupPC using a ZFS (RAIDZ) filesystem for the pool? > > It's currently a Solaris thing (and Linux?) but it's going to be in FreeBSD Not available in the Linux kernel. Some work has apparently been done to make it work under FUSE but I don't think it is usable yet. readonly support is in macos 10.5.0. Readwrite is supposed to arrive in a point release. we use ZFS in a data warehouse application and it is very good, as promised. danno -- Dan Pritts, System Administrator Internet2 office: +1-734-352-4953 | mobile: +1-734-834-7224 ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
