On Thu, 6 Feb 2003, Nico Morrison wrote:
> Hello,
>
> I have upgraded the 'bad' machine with the latest 'up2date' kernel, but it
> is possible that GRUB is still loading the older kernel. Our sysadmin at the
> dayacentre says the console shows the old kernel kernel-2.4.7-10
>
> This might have happened because the first kernel upgrade I did on this
> machine I did manually by downloading the .rpm & installing it locally.
>
> Now I know to use /use/sbin/up2date instead but ......
You may need to add an entry to /etc/grub.conf that looks something like:
title Red Hat Linux (2.4.19)
root (hd0,0)
kernel /vmlinuz-2.4.19 ro root=/dev/hda7
I believe grub picks defaults to booting the first entry it finds, someone
correct me if I'm wrong, I'm not all too familiar with grub...
> How do I tell from the machine (SSH) which kernel it is actually running?
uname -a
> Thanks - sorry to be so ignorant.
No problem :)
> Regards,
> Nico Morrison
> nico.morrison@micronicos.com
> ___________________________________________
> Micronicos Limited - London, UK.
> Tel: +44 20 8870 8849 Fax: +44 20 8870 5290
> ___________________________________________
>
> From: Stephen C. Tweedie [mailto:sct@redhat.com]
> Sent: 05 February 2003 10:13
> To: Nico Morrison
> Cc: 'Andrew Morton'; ext3 users list
> Subject: RE: On very different journalling activity on 2 servers.
>
>
> Hi,
>
> On Wed, 2003-02-05 at 08:45, Nico Morrison wrote:
>
> > [root@ns5 nico]# /sbin/hdparm /dev/hda
> > /dev/hda:
> > using_dma = 0 (off)
>
> > Does this mean that dma is in fact off?
>
> Yes.
>
> > Looks like is ON on the server that has no problems and OFF on the one
> with
> > loadsa journalling?
>
> Yes.
>
> > What do we need to do & is it safe to turn DMA ON on a busy working public
> > internet server?
>
> You don't.
>
> The trouble is, the kernel usually has a reason for not being in DMA
> mode. If it can negotiate DMA, it will; but the older of your two
> systems did not do so, so either that older kernel doesn't know how to
> drive the IDE controller in DMA mode safely, or it has detected an error
> on the IDE bus and has backed off to non-DMA mode automatically. In
> both cases, forcing DMA on manually is not recommended.
>
> I'd suggest that you upgrade the 7.2 box to the current errata kernel,
> which is the same across all the 7.* releases. That should give you the
> same updated IDE drivers as the 7.3 box has, and will hopefully get you
> running DMA properly. If it doesn't, then you're going to have to check
> the logs to see why DMA isn't being negotiated.
>
> Cheers,
> Stephen
>
>
>
> _______________________________________________
>
> Ext3-users@redhat.com
> https://listman.redhat.com/mailman/listinfo/ext3-users
>
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