[Spacewalk-list] rhn_check is generating toomuch I/O hence Spacewalk Client Add took 38 minutes time [ O/S OEL5 version ]

[Avi Miller]

Hi,

Spacewalk does not create the SQLite databases that yum uses, so the first thing yum has to do is rebuild those databases on the client and this is particularly time-consuming on virtual OL5 guests. 

Are these machines subscribed to ol5_latest? If so, I would strongly recommend replacing that channel with a combination of ol5_u11_base and ol5_u11_patch from ULN instead. Those two channels are significantly smaller and will be much easier for the client to rebuild during an rhn_check run.

Alternatively, you can bind mount /var/cache/yum to a RAM disk so that the disk usage is non-existant. This will also dramatically improve performance.

Hope that helps,
Avi

> On 30 Mar 2016, at 8:13 PM, Malla Reddy Madupu <mmreddys at yahoo.com> wrote:
> 
> Hi Guys
> 
> Greatly appreciated for your time.
> 
> I have a issue during spacewalk client add to the spacewalk master server.
> 
> We have staging server where all the VMs are connected to the Oracle SAN storage (Entry Level)
> 
> When i am trying to add the client to the spacewalk server, there's too much I/O generating the rhn_check process some times it's writing more than 50M data, this process is mainly reading/ writing kjournald and Audit. because of this system process  reached to 100% waiting 80%. The client is completely not responding hence over the monitoring system HOST DOWN alert appeared.
> 
> I have tried with --norhnsd option, still no luck. Is there a way to minimize the rhn_check process? is there a way to stop generating too much I/O?
> 
> Could you please suggest some idea here?
> 
> But noticed there's a huge difference with the OEL6. it took roughly 5min time to add the clinet. 
> 
> Guys, pelase help me to address this issue, your help is very much appreciated. Thank you all for you time
> Best Regards
> Malla
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--
Oracle <http://www.oracle.com>
Avi Miller | Product Management Director | +61 (3) 8616 3496
Oracle Linux and Virtualization
417 St Kilda Road, Melbourne, Victoria 3004 Australia

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