> -----Original Message----- > From: fio-owner@xxxxxxxxxxxxxxx [mailto:fio-owner@xxxxxxxxxxxxxxx] On > Behalf Of Brian L. > Sent: Thursday, October 03, 2013 2:09 PM > To: Juergen Salk; fio@xxxxxxxxxxxxxxx > Subject: Re: precondition ssd drives w/ fio > > Thank you all for the response. I found ssd-steadystate.fio in the > tarball. > > Brian > > Brian L. > > > On Thu, Oct 3, 2013 at 1:42 PM, Juergen Salk <juergen.salk@xxxxxx> > wrote: > > * Brian L. <brianclam@xxxxxxxxx> [131003 12:31]: > > > >> For benchmarking SSD drives, I was told that we should precondition > >> our drives to get more accurate real world reading. > >> > >> I was wondering if anyone is using fio itself to precondition ssd > >> drives or use a different script to populate random data on the > >> drives? > > > > Yes I did. The fio source tarball comes with a number of sample > > job files including `ssd-steadystate.fio´, which might be > > useful for preconditioning of ssd devices. > > > > Regards, > > > > Juergen > > > > -- > > GPG A997BA7A | 87FC DA31 5F00 C885 0DC3 E28F BD0D 4B33 A997 BA7A > -- > To unsubscribe from this list: send the line "unsubscribe fio" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Brian, Check the SNIA standard for how to test SSD performance. There are quite likely more elegant solutions, but I use the jobfile below. It is run sequential workloads of 100% write, 100% read, 100% write, and finally 100% read. The purpose of the reads is to force any existing bad or marginal blocks out of the user pool. This will precondition the drive. Please be aware that using numjobs > 1 is may not be a sequential workload. To measure steady state values takes a little more effort. I use the write_bw_log feature, run for several hours, and use statistical analysis to find the mean and standard deviation in the target time frame. Cheers, Jeff [global] thread group_reporting=1 direct=1 norandommap=1 randrepeat=0 refill_buffers ioengine=${IOENGINE} filename=${FILENAME} log_avg_msec=1000 [128kB_SeqWr_1x8_1stPass] write_bw_log=128kB_SeqWr_1x8_1stPass bs=128k rw=write numjobs=1 iodepth=8 [128kB_SeqRd_1x8_1ndPass] stonewall write_bw_log=128kB_SeqRd_1x8_1ndPass bs=128k rw=read numjobs=1 iodepth=8 [128kB_SeqWr_1x8_2ndPass] stonewall write_bw_log=128kB_SeqWr_1x8_2ndPass bs=128k rw=write numjobs=1 iodepth=8 [128kB_SeqRd_1x8_2ndPass] stonewall write_bw_log=128kB_SeqRd_1x8_2ndPass bs=128k rw=read numjobs=1 iodepth=8 -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
