[zfs-discuss] read / write performance comparison raidz1 / raid10
matthias at bodenbinder.de
Fri Feb 2 05:55:49 EST 2018
I ahve to add that I have set recordsize=1m and compression=off.
Am 02.02.2018 um 09:40 schrieb Matthias Bodenbinder via zfs-discuss:
> I have a raidz1 and a raid10 with 4 drives each: 4x WD20EARX on raidz1 and 4x WD40EZRZ on raid10. The raidz1 is an external USB JBOD, the raid10 is internal SATA.
> I did extensive performance tests with fio.
> fio --size=32G --numjobs=5 fio-rw-generic.fio
> and variations of that: --size=5G,10G, etc.
> --numjobs=1,5,10, etc.
> with and without --runtime=60
> My RAM is 32GB.
> In all cases I find that read and write speed are basically equal with less than 5% difference.
> Why is that? I thought that at least for RAID10 the read speed should be significantly higher than write speed.
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