I need some clarification on what data you want collected.... do you want iostat -xm collected before and after? Or at a periodic interval (1 sec)? I'm measuring sustained performance. This means I’m runnig for a period of time -- 1 minute. If you want iostat collected on an interval, that would probably be more data than one would want posted to this mailing list. But... yes, this is a RAID6. I've switched to HDD's as storage as there is concern on the list that the DDR disk devices could be causing unintended behavior in RAID6. With 6 HDD's, each able to do 270 MB/s on their outer edge, I'm getting RAID6 throughput of about 1080 MB/s when I use a thread count of 4, using FIO. -----Original Message----- From: Dallas Clement [mailto:dallas.a.clement@xxxxxxxxx] Sent: Friday, December 04, 2015 10:08 AM To: Robert Kierski Cc: Phil Turmel; linux-raid@xxxxxxxxxxxxxxx Subject: Re: RAID 5,6 sequential writing seems slower in newer kernels Robert, is this with a RAID 6 array? Also, what are the actual throughput numbers you are getting? Would it be possible for you to capture the iostat -xm output and report the individual disk wMB/s and also the disk utilization for RAID 6? ��.n��������+%������w��{.n�����{����w��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
