Details
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Bug
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Resolution: Not a Bug
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Minor
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None
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Lustre 2.3.0, Lustre 2.4.1, Lustre 2.5.0
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None
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"FSTYPE=zfs llmount.sh" configuration with 3 OSTs. Not sure if this is at all relevant to the problem or not.
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3
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8954
Description
It seems that the /proc/fs/lustre/obdfilter//job_stats output for "setattr" is double what is reported for the regular /proc/fs/lustre/obdfilter//stats output:
# grep setattr testfs-OST0000/*stats
testfs-OST0000/job_stats: setattr: { samples: 344, unit: reqs }
testfs-OST0000/stats:setattr 593 samples [reqs]
# grep setattr testfs-OST0000/*stats
testfs-OST0000/job_stats: setattr: { samples: 373, unit: reqs }
testfs-OST0000/stats:setattr 651 samples [reqs]
As you can see, the job_stats setattr count went up 2x the amount for the regular stats setattr count (this is during a simple "cp -av /etc /mnt/testfs" operation from a single client). Conversely, the "write" stats were the same:
# grep write testfs-OST0000/*stats
testfs-OST0000/job_stats: write: { samples: 307, unit: bytes, min: 11, max: 222390, sum: 2001024 }
testfs-OST0000/stats:write_bytes 307 samples [bytes] 11 222390 2001024
It is likely this is a bug in the job_stats handling, since the total number of write operations ~= total number of setattr ~= total regular files copied, but job_stats is almost 2x this number at the end.
# find /etc -type f | wc -l
1281
# grep setattr testfs-OST000*/*stats
testfs-OST0000/job_stats: setattr: { samples: 426, unit: reqs }
testfs-OST0000/stats:setattr 758 samples [reqs]
testfs-OST0001/job_stats: setattr: { samples: 427, unit: reqs }
testfs-OST0001/stats:setattr 761 samples [reqs]
testfs-OST0002/job_stats: setattr: { samples: 427, unit: reqs }
testfs-OST0002/stats:setattr 752 samples [reqs]
# grep write testfs-OST000*/*stats
testfs-OST0000/job_stats: write: { samples: 418, unit: bytes, min: 4, max: 644275, sum: 3295088 }
testfs-OST0000/stats:write_bytes 418 samples [bytes] 4 644275 3295088
testfs-OST0001/job_stats: write: { samples: 425, unit: bytes, min: 5, max: 1048576, sum: 8450420 }
testfs-OST0001/stats:write_bytes 425 samples [bytes] 5 1048576 8450420
testfs-OST0002/job_stats: write: { samples: 421, unit: bytes, min: 1, max: 1048576, sum: 9396075 }
testfs-OST0002/stats:write_bytes 421 samples [bytes] 1 1048576 9396075