you need to benchmark for a little more than 4KB sequential even for the T-log. Test for the following
8KB random read and write
4-60KB sequential write
64KB sequential read and write
up to 128KB sequential write
up to256KB sequential read
Despite the advances in RAID5 i would expect a well defined RAID10 array to have superior write performance. I'm sure others will jump in here.
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"Ya can't make an omelette without breaking just a few eggs" 😉