High I/O HDD usage by jbd2

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High I/O HDD usage by jbd2

Postby mackowiakp » May 4th, '21, 09:44

On one of the computers with M8 installed, the jbd2 process takes up 6% of I/O on the HDD, without doing something special. Just system is booted. It is dangerous because it is SSD HDD.
This process runs on a filesystem which is /home. Previously, it was similar on filesystem root, but I disabled (mask) systemd-journald and for the root partition the jbd2 process no longer takes up any significant part of the I/O on the HDD.
I have no idea what process causes such extensive modification of the filesystem journal. I tried to figure out something with "lsof", "iotop" but found nothing.
On other computers, this problem does not occur. And the one with which there is a problem has a "clean" M8 installation made during the upgrade from M7 (at least root).
What else can I check to find out what's so heavy on the I/O ? Any idea?
Below the output from the command "iotop -ao" :

Code: Select all
Total DISK READ :       0.00 B/s | Total DISK WRITE :     230.75 K/s
Actual DISK READ:       0.00 B/s | Actual DISK WRITE:       2.16 M/s
    TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND         
    778 be/3 root          0.00 B    268.00 K  0.00 %  5.81 % [jbd2/sda7-8]
 857822 be/4 root          0.00 B      0.00 B  0.00 %  0.09 % [kworker/1:0-events]
    505 be/3 root          0.00 B     36.00 K  0.00 %  0.01 % [jbd2/sda5-8]
    783 be/3 root          0.00 B     36.00 K  0.00 %  0.01 % [jbd2/sda8-8]
 803144 be/4 root          0.00 B      4.00 K  0.00 %  0.00 % encfs -S ~ciek/dir_v
1239569 be/4 maciek        0.00 B    168.00 K  0.00 %  0.00 % chrome --~PoolForeg]
1101074 be/4 maciek        0.00 B     20.00 K  0.00 %  0.00 % skypeforl~PoolForeg]
1216696 be/4 root          0.00 B      0.00 B  0.00 %  0.00 % [kworker/~onversion]
1255222 be/4 root          0.00 B      0.00 B  0.00 %  0.00 % [kworker/~s_unbound]
   2775 be/4 maciek        0.00 B     48.00 K  0.00 %  0.00 % ./insync start
   3362 be/4 maciek        0.00 B     92.00 K  0.00 %  0.00 % chrome
   3408 be/4 maciek        0.00 B      4.00 K  0.00 %  0.00 % chrome [HangWatcher]
   3414 be/4 maciek        0.00 B     28.00 K  0.00 %  0.00 % chrome [C~_IOThread]
   3444 be/4 maciek        0.00 B      4.00 K  0.00 %  0.00 % chrome [C~hread_Blo]
1255641 be/4 maciek        0.00 B      8.00 K  0.00 %  0.00 % chrome [T~PoolForeg]
 643579 be/4 maciek        0.00 B     12.00 K  0.00 %  0.00 % nextcloud
 645265 be/4 root          0.00 B      4.00 K  0.00 %  0.00 % encfs -S ~ciek/dir_v
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Re: High I/O HDD usage by jbd2

Postby doktor5000 » May 4th, '21, 17:43

~2,5 MB/s is considered heavy I/O while you have chrome, encfs, nextcloud and insync running ?

Also, regarding "It is dangerous because it is SSD HDD" - we're not really in the stone age of SSDs anymore, and a journal is not dangerous.
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Re: High I/O HDD usage by jbd2

Postby mackowiakp » May 4th, '21, 18:45

Yeah. But on other computers running the same applications, HDD I/O usage is close to "0".
Linux is like wigwam. No Windows, no Gates but Apache inside

WARNING ! The administrator has the right to refuse to install WINDOWS, invoking the conscience clause
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