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RE: On very different journalling activity on 2 servers.



Hello Andrew,

Thanks again ....

So to summarise:
1. Can take the server down (say on a Sat morning) and try turning on DMS
access - but you say this is pretty unsafe.
2. Can upgrade the kernel to match the other machine.
Current:
	Good server (7.3) (DMA yes):	kernel-2.4.18-18.7.x
	Bad server (7.2) (DMA no):	kernel-2.4.18-18.7.x

So they both use currently the same kernel ....

There IS an upgrade available but since they both currently use the same
kernel - will upgrading help?

What would you recommend?

Regards,
Nico Morrison
nico morrison micronicos com
___________________________________________
Micronicos Limited  -  London, UK.
Tel: +44 20 8870 8849 Fax: +44 20 8870 5290
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-----Original Message-----
From: Andrew Morton [mailto:akpm digeo com]
Sent: 05 February 2003 08:53
To: Nico Morrison
Cc: ext3-users redhat com
Subject: Re: On very different journalling activity on 2 servers.


Nico Morrison <nico morrison micronicos com> wrote:
>
> Does this mean that dma is in fact off?

Yes.

> So on that server is it saying dma is on?

Yes.

> What do we need to do & is it safe to turn DMA ON on a busy working public
> internet server?

`hdparm -d 1' will force DMA on.  No, it is not safe to do on a busy server.

It is said to be quite unsafe.

If you can schedule some downtime to try that and to test it carefully then
maybe.  But upgrading the kernel to match the well-behaving machine sounds
wiser.





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