Hi Neal, We've been getting pretty good performance out of RAID-Z2 with 3x 6-disk RAID-Z2 stripes. More stripes mean better performance all around...particularly on random reads. But as a file-server that's probably not a concern. With RAID-Z2 it seems to me 2 hot-spares is very sufficient, but I'll defer to others with more knowledge.
Best Regards, Jason On 1/23/07, Neal Pollack <[EMAIL PROTECTED]> wrote:
Hi: (Warning, new zfs user question) I am setting up an X4500 for our small engineering site file server. It's mostly for builds, images, doc archives, certain workspace archives, misc data. I'd like a trade off between space and safety of data. I have not set up a large ZFS system before, and have only played with simple raidz2 with 7 disks. After reading "http://blogs.sun.com/relling/entry/raid_recommendations_space_vs_mttdl"; I am leaning toward a RAID-Z2 config with spares, for approx 15 terabytes, but I do not yet understand the nomenclature and exact config details. For example, the graph/chart shows that 7+2 RAID-Z2 with spares would be a good balance in capacity and data safety, but I do not know what to do with that number, how it maps to an actual setup? Does that type of config also provide a balance between performance and data safety? Can someone provide an actual example of how the config should look? If I save two disks for the boot, how do the other 46 disks get configured between spares and zfs groups? Thanks, Neal _______________________________________________ zfs-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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