https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290579
Bug ID: 290579
Summary: Strange statistics zpool iostat on a heavily loaded
system
Product: Base System
Version: 15.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
There are two servers on 15.0-BETA2-p1, serving a lot of data.
On one of them:
# zpool iostat 1
capacity operations bandwidth
pool alloc free read write read write
---------- ----- ----- ----- ----- ----- -----
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
vol 120G 6.15T 14 23 4.43M 7.87M
And it goes on indefinitely—the numbers don’t change.
On the second:
# zpool iostat 1
capacity operations bandwidth
pool alloc free read write read write
---------- ----- ----- ----- ----- ----- -----
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
vol 1.26T 5.01T 9 26 5.87M 10.5M
And this one also goes on endlessly. Even after an hour, it’s the same numbers
on both.
That can’t be right.
On an identical server with the same workload, running 14.3-RELEASE, the
picture is different—normal:
# zpool iostat 1
capacity operations bandwidth
pool alloc free read write read write
---------- ----- ----- ----- ----- ----- -----
vol 32.8G 6.23T 7 30 4.33M 11.3M
vol 32.8G 6.23T 0 0 0 0
vol 32.8G 6.23T 0 0 0 0
vol 33.0G 6.23T 0 572 0 155M
vol 33.0G 6.23T 0 0 0 0
vol 33.0G 6.23T 0 0 0 0
vol 33.0G 6.23T 0 0 0 0
vol 33.0G 6.23T 0 0 0 0
vol 33.0G 6.23T 0 180 0 80.1M
vol 33.0G 6.23T 0 274 0 61.6M
vol 32.6G 6.23T 0 15 0 61.1K
vol 32.6G 6.23T 0 0 0 0
vol 32.6G 6.23T 0 0 0 0
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