[Ocfs2-users] NEWBIE: constant disk access Q

Sunil Mushran Sunil.Mushran at oracle.com
Tue Sep 18 11:01:04 PDT 2007


That's the disk heartbeat. 1 block write and X blocks read every 2 secs.
X is the number of nodes defined in the cluster and a block is 512 bytes.
 
AJ Weber wrote:
> I just configured-up my first, two-node OCFS2 cluster with one 
> mount-point (sdb1).  (I know, hooray for you, newbie.)
>  
> I'm just noticing that there is almost-constant activity on sdb, even 
> when neither node is actually doing anything (obvious) with the 
> mount-point.  The OCFS2 cluster is started and running on both nodes, 
> but there are no procs or users using the fs, yet there's so much 
> "overhead"?
>  
> Is this common and to be expected?  Are there any "tuning parameters" 
> (other than number of nodes) that I should be aware of?  I'm just 
> surprised at how much disk activity is happening with nothing using 
> the disks, and am almost afraid of what happens when we get a 
> disk-intensive app using it from multiple nodes.
>  
> NOTE: This is not intended for a RAC install at this time.  Versions: 
> CentOS 4.5, OCFS2-1.2.5.
>  
> Thanks in advance for any advice/pointers/tips.
> -AJ
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