Details
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Bug
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Resolution: Fixed
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Minor
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Lustre 2.8.0
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None
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master, RHEL7.1, OSD-ZFS
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3
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9223372036854775807
Description
When obdfilter-survey on osd-zfs, the read test starts before all writes completed.
# size=65536 nobjlo=1 nobjhi=1 thrlo=1 thrhi=1 tests_str="write read" \
/usr/bin/obdfilter-survey
Here is iostat result when obdfilter-survey is running.
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util dm-6 0.00 0.00 0.00 5506.00 0.00 678.23 252.27 5.43 0.99 0.00 0.99 0.18 98.00 dm-6 0.00 0.00 0.00 6467.00 0.00 808.51 256.04 5.94 0.92 0.00 0.92 0.15 100.00 dm-6 0.00 0.00 0.00 6136.00 0.00 766.75 255.92 5.94 0.97 0.00 0.97 0.16 100.00 dm-6 0.00 0.00 0.00 6808.00 0.00 850.88 255.96 5.94 0.87 0.00 0.87 0.15 100.00 dm-6 0.00 0.00 0.00 7520.00 0.00 940.00 256.00 6.19 0.82 0.00 0.82 0.13 100.00 dm-6 0.00 0.00 0.00 8505.00 0.00 1063.01 255.97 6.50 0.76 0.00 0.76 0.12 100.00 dm-6 0.00 0.00 0.00 8847.00 0.00 1105.88 256.00 5.94 0.67 0.00 0.67 0.11 100.00 dm-6 0.00 0.00 0.00 9424.00 0.00 1168.48 253.93 5.92 0.63 0.00 0.63 0.10 98.80 dm-6 0.00 0.00 0.00 9631.00 0.00 1203.88 256.00 5.95 0.62 0.00 0.62 0.10 100.00 dm-6 0.00 0.00 250.00 8748.00 31.25 1093.38 255.97 6.37 0.68 5.20 0.55 0.11 100.00 dm-6 0.00 0.00 73.00 6805.00 9.12 850.62 256.00 5.84 0.87 42.63 0.42 0.15 100.00 dm-6 0.00 0.00 621.00 4144.00 77.62 517.88 255.95 4.28 0.93 5.04 0.31 0.21 100.00 dm-6 0.00 0.00 903.00 3501.00 112.87 437.62 256.00 3.98 0.90 3.32 0.28 0.23 100.00 dm-6 0.00 0.00 804.00 3631.00 100.50 454.00 256.06 3.96 0.83 3.35 0.27 0.23 100.00 dm-6 0.00 0.00 864.00 3522.00 108.00 440.12 255.94 3.98 0.98 3.83 0.28 0.23 100.10 dm-6 0.00 0.00 987.00 3512.00 123.37 439.00 256.00 3.99 0.87 2.97 0.28 0.22 100.00 dm-6 0.00 0.00 869.00 3515.00 108.62 438.07 255.39 3.96 0.92 3.55 0.27 0.23 100.00 dm-6 0.00 0.00 879.00 3493.00 109.87 432.71 254.17 3.98 0.91 3.42 0.28 0.23 100.00 dm-6 0.00 0.00 1001.00 4029.00 125.12 503.62 256.00 3.97 0.79 2.99 0.24 0.20 100.00 dm-6 0.00 0.00 465.00 5915.00 58.13 739.38 256.00 3.96 0.61 6.35 0.16 0.16 100.00 dm-6 0.00 0.00 3642.00 820.00 455.25 96.58 253.28 3.15 0.72 0.84 0.16 0.22 100.00 dm-6 0.00 0.00 4794.00 0.00 599.25 0.00 256.00 3.00 0.63 0.63 0.00 0.21 100.00 dm-6 0.00 0.00 4419.00 0.00 552.38 0.00 256.00 3.01 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4422.00 0.00 552.75 0.00 256.00 2.99 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4417.00 0.00 552.12 0.00 256.00 3.01 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4433.00 0.00 554.12 0.00 256.00 2.99 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4413.00 0.00 551.62 0.00 256.00 3.01 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4407.00 0.00 550.88 0.00 256.00 3.00 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4416.00 0.00 552.00 0.00 256.00 2.99 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4399.00 0.00 549.88 0.00 256.00 2.98 0.68 0.68 0.00 0.23 100.00 dm-6 0.00 0.00 4365.00 0.00 545.62 0.00 256.00 2.98 0.68 0.68 0.00 0.23 99.40 dm-6 0.00 0.00 4380.00 0.00 547.50 0.00 256.00 3.00 0.69 0.69 0.00 0.23 100.00 dm-6 0.00 0.00 4392.00 0.00 549.00 0.00 256.00 2.98 0.68 0.68 0.00 0.23 100.00
It shows write and read are overlap which means read tests started before all data flushed.