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Bug #13389

closed

After persistent L2ARC import, cache device has constant 8KB/sec load

Added by Adam Stylinski over 1 year ago. Updated over 1 year ago.

Status:
Closed
Priority:
Normal
Assignee:
Dan McDonald
Category:
zfs - Zettabyte File System
Start date:
Due date:
% Done:

100%

Estimated time:
Difficulty:
Medium
Tags:
Gerrit CR:

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).

Files

persist_l2arc_008_pos.txt (7.54 KB) persist_l2arc_008_pos.txt stdout of passing test Jason King, 2021-02-22 07:13 PM
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