Hi Mike, > If I was to plan for a 16 disk ZFS-based system, you would probably > suggest me to configure it as something like 5+1, 4+1, 4+1 all raid-z > (I don't need the double parity concept) > > I would prefer something like 15+1 :) I want ZFS to be able to detect > and correct errors, but I do not need to squeeze all the performance > out of it (I'll be using it as a home storage server for my DVDs and > other audio/video stuff. So only a few clients at the most streaming > off of it)
this is possibe. ZFS in theory does not significantly limit the n and 15+1 is indeed possible. But for a number of reasons (among them performance) people generally advise to use no more than 10+1. A lot of ZFS configuration wisdom can be found on the Solaris internals ZFS Best Practices Guide Wiki at: http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide Richard Elling has done a great job of thoroughly analyzing different reliability concepts for ZFS in his blog. One good introduction is the following entry: http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance That may help you find the right tradeoff between space and reliability. Hope this helps, Constantin -- Constantin Gonzalez Sun Microsystems GmbH, Germany Platform Technology Group, Global Systems Engineering http://www.sun.de/ Tel.: +49 89/4 60 08-25 91 http://blogs.sun.com/constantin/ Sitz d. Ges.: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten Amtsgericht Muenchen: HRB 161028 Geschaeftsfuehrer: Marcel Schneider, Wolfgang Engels, Dr. Roland Boemer Vorsitzender des Aufsichtsrates: Martin Haering _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
