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