[Fedora-livecd-list] persistence testing howto

[Mike Dickson]

Ran that and yes the snapshot area filled up BEFORE the errors.  Let me
know what I can do....

MikeD

On Thu, 2008-01-03 at 16:31 -0600, Douglas McClendon wrote:

> Mike Dickson wrote:
> > Guys,
> > 
> > I got a LiveCD + Persistence usb drive running from your scripts, but 
> > got I/O errors if I tried to do a yum update.
> > 
> > Before that I was able to vi test.txt and put some text in and it 
> > survived a reboot.
> > 
> > What can I do to address the i/o errors?
> 
> My first question/explanation would be that you filled up the snapshot 
> device.  This is quite possible, as a yum install involves creating 
> several copies of the actual files you end up installing.
> 
> The way to see if this is what is happening would be to have another 
> terminal open, and periodically watch the output of "dmsetup status". 
> As new blocks are written to the rootfs snapshot device, you will see 
> the snapshot filling up.
> 
> If you get these IO errors even before the snapshot fills up, please try 
> to post some more detailed output.
> 
> In general, as discussed there are pros and cons with this method, and a 
> unionfs method.  I do think there are ways to work around the cons of 
> this method in such a way that it is useful.  For instance, I'll play 
> around and see if I can prescribe a process of using yum that will get 
> it to create all of its intermediate files in a native tmpfs (/dev/shm 
> or the like) instead of the rootfs, so that they don't eat into the 
> snapshot space.  Likewise, now that I have my first actual tester, maybe 
> I'll figure out some other creative ways to improve the method (I have 
> some ideas I need to experiment with...).
> 
> Thanks,
> 
> -dmc
> 
> 
> 
> > 
> > MikeD
> > 
> > "Messsage from syslogd at localhost <mailto:syslogd at localhost> at
> >   kernel: journal commit i/o error"
> > 
> > 
> > On Wed, 2008-01-02 at 04:07 -0800, Mike Dickson wrote:
> >> I have some time now.  I am attempting this tonight and tomorrow.  I 
> >> will let you know.
> >>
> >> MikeD
> >>
> > 
> > 
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> > 
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