On Thu, Feb 18, 2010 at 4:36 PM, Dan Naumov <[email protected]> wrote:
> > A stripe of 3-way mirrors, whoa. Out of curiosity, what is the system > used for? I am not doubting that there exist some uses/workloads for a > system that uses 6 disks with 2 disks worth of usable space, but > that's a bit of an unusual configuration. What are your system/disc > specs and what kind of performance are you seeing from the pool? > It's for a reasonably busy webserver hosting a few hundred domains, which tends to be somewhat seek-intensive. For this pool we had two main criteria: speed and double-disk redundancy. A stripe of three two-way mirrors would only give us single-disk redundancy in the worst case (i.e. losing both disks in one of the mirrors), so we went with two three-way mirrors instead. Even though we're only getting the capacity of two disks worth of space, we'll still have 6x the capacity of the array it's replacing. A simple-minded dd test gives me ~180MB/s writing a single long file, and 400-500MB/s reading. Matt _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
