Comment # 1 on bug 1183990 from Carlos Robinson

I forgot to paste some command output when the disk is "busy" - interesting
lines are marked with arrows (not necessarily from the same day, it takes some
time to copy paste):

iotop:

Total DISK READ :       0.00 B/s | Total DISK WRITE :     368.01 K/s
Actual DISK READ:       0.00 B/s | Actual DISK WRITE:     269.56 K/s
  TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
25530 be/4 root        0.00 B/s  332.85 K/s  0.00 % 97.58 %
[kworker/u64:1+flush-8:32]  <==
25104 be/4 root        0.00 B/s    4.69 K/s  0.00 %  1.41 %
[kworker/8:1-events]
 1408 be/3 root        0.00 B/s   11.72 K/s  0.00 %  1.25 % [jbd2/sdc10-8]
25944 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.04 %
[kworker/0:2-events]
25637 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.04 %
[kworker/0:0-events]
11191 be/4 cer         0.00 B/s   18.75 K/s  0.00 %  0.00 % firefox -P Small
[localStorage DB]


atop:

PRC |  sys    0.84s   |  user   1.73s   |  #proc    625  |   #zombie    1  |  
no  procacct  |
CPU |  sys      10%   |  user     29%   |  irq       1%  |   idle   1065%  |  
wait     96%  |
CPL |  avg1    0.86   |  avg5    0.45   |  avg15   0.41  |   csw   102167  |  
intr   58821  |
MEM |  tot    31.3G   |  free   13.2G   |  cache   2.8G  |   buff    1.4G  |  
slab    1.2G  |
SWP |  tot   100.0G   |  free   94.8G   |                |   vmcom  29.4G  |  
vmlim 115.7G  |
LVM |     cr_cripta   |  busy      1%   |  read       0  |   write      2  |  
avio 34.0 ms  |
DSK |           sdc   |  busy     99%   |  read       0  |   write    399  |  
avio 24.9 ms  | <==
NET |  transport      |  tcpi      11   |  tcpo      17  |   udpi       0  |  
udpo       0  |
NET |  network        |  ipi       12   |  ipo       17  |   ipfrw      0  |  
deliv     12  |
NET |  eth0      0%   |  pcki      13   |  pcko      18  |   si    1 Kbps  |  
so    1 Kbps  |



  PID SYSCPU USRCPU  VGROW  RGROW  RUID     EUID     ST EXC   THR S CPUNR  CPU 
CMD        1/6
10990  0.06s  0.22s     0K   172K  cer      cer      --   -    64 S     7   3% 
Web Content
10799  0.08s  0.19s     0K     0K  cer      cer      --   -    81 S     5   3% 
firefox
11012  0.02s  0.23s     0K   -84K  cer      cer      --   -    60 S     8   2% 
Web Content
 9585  0.03s  0.20s     0K     0K  root     root     --   -     1 S     0   2% 
iotop
11096  0.04s  0.18s  1024K  1784K  cer      cer      --   -    58 S     2   2% 
Web Content
 4288  0.19s  0.00s 14356K     0K  root     root     --   -    21 S     3   2% 
X