[ale] kjournald?

[Jim Kinney]

Is it one journal write per file or per inode used per file?
On Sep 19, 2011 4:24 PM, "David Tomaschik" <david at systemoverlord.com> wrote:
> On Mon, Sep 19, 2011 at 3:19 PM, John Heim <john at johnheim.net> wrote:
>>        What (if anything) does it mean if iotop shows that the process
>> doing the most disk I/O is kjournald? Actually, on 4 partitions that I
have
>> on an ISCSI array, the kjournald process is the top I/O on each.
>>
>> I'm thinking of setting the noatime option in my fstab.
>
> It means that the journal on those disks is being written to a lot.
> Typically, you'll see this with lots of small writes. Each write
> requires the following:
>
> 1) Write change to journal.
> 2) Write change to filesystem.
> 3) Mark change as done in journal.
>
> So that's 2 journal writes for every FS write.
>
>
> --
> David Tomaschik, RHCE, LPIC-1
> System Administrator/Open Source Advocate
> OpenPGP: 0x5DEA789B
> http://systemoverlord.com
> david at systemoverlord.com
>
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