rendered paste bodySome side info:
/dev/md4 is the export, it consists of /dev/sd[e-l]
Don't mind the high CPU, it runs boinc (worldcommunitygrid) as well.
Local dd if=/dev/zero of=/mnt/export/bigfucker bs=1M count=40960. This does about 275MiB/s
avg-cpu: %user %nice %system %iowait %steal %idle
0.08 49.42 21.33 12.00 0.00 17.17
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdc 0.33 103.67 2.33 17.33 0.07 0.47 56.27 0.27 13.90 15.71 13.65 7.63 15.00
sdb 0.00 103.67 1.33 17.33 0.01 0.47 52.71 0.23 12.14 5.00 12.69 6.96 13.00
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdk 40.33 10514.67 9.67 541.00 0.20 43.11 161.08 1.68 3.06 16.90 2.81 0.97 53.33
sde 36.33 10556.33 7.00 496.00 0.17 43.24 176.76 1.72 3.43 15.71 3.26 0.94 47.33
sdi 37.67 10568.00 9.33 483.67 0.19 43.27 180.52 1.72 3.50 16.79 3.25 0.98 48.33
sdg 50.00 10570.33 10.33 483.00 0.24 43.25 180.55 2.64 5.37 17.10 5.12 1.20 59.33
sdf 49.67 10561.33 8.33 490.67 0.23 43.05 177.65 2.09 4.14 17.60 3.91 1.19 59.33
sdh 20.67 10579.33 5.67 481.00 0.11 43.14 181.99 2.03 4.18 19.41 4.00 1.04 50.67
sdj 38.00 10574.67 10.33 481.33 0.19 43.24 180.92 2.69 5.45 18.06 5.18 1.19 58.33
sdl 23.33 10556.67 7.33 499.33 0.12 43.12 174.79 1.69 3.34 19.09 3.10 0.92 46.67
md4 0.00 0.00 0.00 66313.67 0.00 259.04 8.00 0.00 0.00 0.00 0.00 0.00 0.00
md3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md1 0.00 0.00 4.00 15.00 0.08 0.06 14.46 0.00 0.00 0.00 0.00 0.00 0.00
md2 0.00 0.00 0.00 104.67 0.00 0.41 8.00 0.00 0.00 0.00 0.00 0.00 0.00
Copying large file in VM (only vm on the storage, nothing else accessing it):
avg-cpu: %user %nice %system %iowait %steal %idle
0.08 47.50 2.08 26.42 0.00 23.92
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdc 0.00 4.00 0.33 1.33 0.00 0.02 27.20 0.02 12.00 10.00 12.50 12.00 2.00
sdb 0.00 4.00 0.00 1.33 0.00 0.02 32.00 0.02 12.50 0.00 12.50 12.50 1.67
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sdk 61.67 145.67 29.00 66.67 1.54 0.75 49.06 1.10 11.50 16.90 9.15 4.98 47.67
sde 76.00 121.67 38.67 66.00 1.64 0.65 44.84 0.74 7.07 9.31 5.76 2.99 31.33
sdi 68.67 142.00 31.33 71.33 1.46 0.75 44.18 0.84 8.18 11.06 6.92 4.16 42.67
sdg 55.00 159.67 29.00 75.33 1.39 0.83 43.58 1.30 12.46 15.17 11.42 6.07 63.33
sdf 53.33 145.00 27.33 73.67 1.56 0.77 47.29 1.32 13.17 14.63 12.62 5.28 53.33
sdh 77.00 127.00 35.33 69.33 1.67 0.68 46.01 0.88 8.47 10.57 7.40 3.22 33.67
sdj 56.00 143.00 32.33 68.00 1.49 0.74 45.42 0.60 5.95 8.66 4.66 2.92 29.33
sdl 78.33 134.33 36.00 67.67 1.58 0.71 45.12 1.03 10.00 13.24 8.28 3.86 40.00
md4 0.00 0.00 214.00 901.33 10.04 3.47 24.81 0.00 0.00 0.00 0.00 0.00 0.00
md3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md2 0.00 0.00 0.33 4.67 0.00 0.02 8.00 0.00 0.00 0.00 0.00 0.00 0.00