Erik Trimble <Erik.Trimble <at> Sun.COM> writes: > Marc Bevand wrote: > > 7500rpm (SATA) drives clearly provide the best TB/$, throughput/$, IOPS/$. > > You can't argue against that. To paraphrase what was said earlier in this > > thread, to get the best IOPS out of $1000, spend your money on 10 7500rpm > > (SATA) drives instead of 3 or 4 15000rpm (SAS) drives. Similarly, for the > > best IOPS/RU, 15000rpm drives have the advantage. Etc. > > Be very careful about that. 73GB SAS drives aren't that expensive, so > you can get 6 x 73GB 15k SAS drives for the same amount as 11 x 250GB > SATA drives (per Sun list pricing for J4200 drives). SATA doesn't > always win the IOPS/$. Remember, a SAS drive can provide more than 2x > the number of IOPs a SATA drive can.
Well let's look at a concrete example: - cheapest 15k SAS drive (73GB): $180 [1] - cheapest 7.2k SATA drive (160GB): $40 [2] (not counting a 80GB at $37) The SAS drive most likely offers 2x-3x the IOPS/$. Certainly not 180/40=4.5x [1] http://www.newegg.com/Product/Product.aspx?Item=N82E16822116057 [2] http://www.newegg.com/Product/Product.aspx?Item=N82E16822136075 -marc _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
