>>> On Mon, 27 Feb 2017 22:11:29 +0000, p...@btrfs.list.sabi.co.uk (Peter
>>> Grandi) said:
> [ ... ]
>> I have a 6-device test setup at home and I tried various setups
>> and I think I got rather better than that.
[ ... ]
> That's a range of 700-1300 4KiB random mixed-rw IOPS,
Rerun with 1M blocksize:
soft# fio --directory=/mnt/sdb5 --runtime=30 --status-interval=10
--blocksize=1M blocks-randomish.fio | tail -3
Run status group 0 (all jobs):
READ: io=2646.0MB, aggrb=89372KB/s, minb=7130KB/s, maxb=7776KB/s,
mint=30081msec, maxt=30317msec
WRITE: io=2297.0MB, aggrb=77584KB/s, minb=6082KB/s, maxb=6796KB/s,
mint=30081msec, maxt=30317msec
soft# fio --directory=/mnt/sdb6 --runtime=30 --status-interval=10
--blocksize=1M blocks-randomish.fio | tail -3
Run status group 0 (all jobs):
READ: io=2781.0MB, aggrb=94015KB/s, minb=5932KB/s, maxb=10290KB/s,
mint=30121msec, maxt=30290msec
WRITE: io=2431.0MB, aggrb=82183KB/s, minb=4779KB/s, maxb=9102KB/s,
mint=30121msec, maxt=30290msec
soft# killall -9 fio
fio: no process found
soft# fio --directory=/mnt/md0 --runtime=30 --status-interval=10
--blocksize=1M blocks-randomish.fio | tail -3
Run status group 0 (all jobs):
READ: io=1504.0MB, aggrb=50402KB/s, minb=3931KB/s, maxb=4387KB/s,
mint=30343msec, maxt=30556msec
WRITE: io=1194.0MB, aggrb=40013KB/s, minb=3158KB/s, maxb=3475KB/s,
mint=30343msec, maxt=30556msec
Interesting that Btrfs 'single' on MD RAID10 becomes rather
slower (I guess low level of intrinsic parallelism).
For comparison, the same on a JFS on top of MD RAID10:
soft# grep -A1 md40 /proc/mdstat
md40 : active raid10 sdg4[5] sdd4[2] sdb4[0] sdf4[4] sdc4[1] sde4[3]
486538240 blocks super 1.0 512K chunks 3 near-copies [6/6] [UUUUUU]
soft# fio --directory=/mnt/md40 --runtime=30 --status-interval=10
--blocksize=4K blocks-randomish.fio | grep -A2 '(all jobs)' | tail -3
Run status group 0 (all jobs):
READ: io=31408KB, aggrb=1039KB/s, minb=80KB/s, maxb=90KB/s,
mint=30206msec, maxt=30227msec
WRITE: io=27800KB, aggrb=919KB/s, minb=70KB/s, maxb=81KB/s, mint=30206msec,
maxt=30227msec
soft# fio --directory=/mnt/md40 --runtime=30 --status-interval=10
--blocksize=1M blocks-randomish.fio | grep -A2 '(all jobs)' | tail -3
Run status group 0 (all jobs):
READ: io=2151.0MB, aggrb=72619KB/s, minb=5865KB/s, maxb=6383KB/s,
mint=30134msec, maxt=30331msec
WRITE: io=1772.0MB, aggrb=59824KB/s, minb=4712KB/s, maxb=5365KB/s,
mint=30134msec, maxt=30331msec
XFS is usually better at multithreaded workloads within the same
file (rather than across files).
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