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Bug #13389
closedAfter persistent L2ARC import, cache device has constant 8KB/sec load
Start date:
Due date:
% Done:
100%
Estimated time:
Difficulty:
Medium
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Description
I can't say for certain which revision caused this, but I'm seeing a constant 8KB/sec load on my L2ARC device in my pool, regardless of how idle it is.
capacity operations bandwidth pool alloc free read write read write ------------------------- ----- ----- ----- ----- ----- ----- rpool1 107G 115G 0 0 0 0 c8t5001B44F00970028d0s0 107G 115G 0 0 0 0 ------------------------- ----- ----- ----- ----- ----- ----- sqlpool 29.8G 192G 0 0 0 0 mirror 9.98G 64.0G 0 0 0 0 c8t50014EE6034B2CC7d0 - - 0 0 0 0 c8t50014EE0ABA3B6B9d0 - - 0 0 0 0 mirror 9.97G 64.0G 0 0 0 0 c5t4d0 - - 0 0 0 0 c5t5d0 - - 0 0 0 0 mirror 9.88G 64.1G 0 0 0 0 c5t1d0 - - 0 0 0 0 c8t50014EE057470E4Bd0 - - 0 0 0 0 logs - - - - - - c15tE4D25CFBDE0F0100d0 40K 54.5G 0 0 0 0 cache - - - - - - c5t2d0 4.98G 88.1G 0 0 0 7.95K ------------------------- ----- ----- ----- ----- ----- ----- capacity operations bandwidth pool alloc free read write read write ------------------------- ----- ----- ----- ----- ----- ----- rpool1 107G 115G 0 0 0 0 c8t5001B44F00970028d0s0 107G 115G 0 0 0 0 ------------------------- ----- ----- ----- ----- ----- ----- sqlpool 29.8G 192G 0 0 0 0 mirror 9.98G 64.0G 0 0 0 0 c8t50014EE6034B2CC7d0 - - 0 0 0 0 c8t50014EE0ABA3B6B9d0 - - 0 0 0 0 mirror 9.97G 64.0G 0 0 0 0 c5t4d0 - - 0 0 0 0 c5t5d0 - - 0 0 0 0 mirror 9.88G 64.1G 0 0 0 0 c5t1d0 - - 0 0 0 0 c8t50014EE057470E4Bd0 - - 0 0 0 0 logs - - - - - - c15tE4D25CFBDE0F0100d0 40K 54.5G 0 0 0 0 cache - - - - - - c5t2d0 4.98G 88.1G 0 0 0 7.96K ------------------------- ----- ----- ----- ----- ----- -----
extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 1.6 0.0 113.3 0.0 0.0 0.0 0.2 0 0 c15tE4D25CFBDE0F0100d0 0.1 0.2 2.5 3.9 0.0 0.0 1.5 0.2 0 0 rpool1 0.0 1.1 0.1 45.2 0.0 0.0 0.0 0.3 0 0 c5t2d0 0.1 0.9 3.4 28.3 0.0 0.0 0.2 0.9 0 0 c5t4d0 0.1 0.9 3.6 28.3 0.0 0.0 0.1 0.9 0 0 c5t5d0 0.1 0.9 3.7 28.2 0.0 0.0 0.1 0.4 0 0 c5t1d0 0.1 0.9 3.6 28.2 0.0 0.0 0.0 1.0 0 0 c8t50014EE057470E4Bd0 0.1 0.9 3.4 28.2 0.0 0.0 0.0 1.0 0 0 c8t50014EE0ABA3B6B9d0 0.1 0.9 3.9 28.2 0.0 0.0 0.0 0.4 0 0 c8t50014EE6034B2CC7d0 0.1 0.2 2.5 3.9 0.0 0.0 0.0 0.2 0 0 c8t5001B44F00970028d0 0.6 8.1 21.8 327.8 0.1 0.0 11.1 0.7 0 0 sqlpool extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 c5t2d0 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.3 0 0 sqlpool extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 c5t2d0 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 sqlpool extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 c5t2d0 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 sqlpool extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 c5t2d0 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.3 0 0 sqlpool extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.2 0 0 c5t2d0 0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.3 0 0 sqlpool
For the sake of not slowly killing the flash, it'd be nice to get to the bottom of this at some point (even if it is cheap TLC).
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