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тАО06-22-2006 09:12 PM
тАО06-22-2006 09:12 PM
Does it matter (performanswise or other) on which cluster node I activate vfast? (Or on which node I enable e.g. defragment?)
The system is two clustered ES80 running Tru64 5.1 PK5. Except for 2 local disks on each node, the disks are on an EVA5000 shared between the nodes.
Thanks,
├Цrjan
Solved! Go to Solution.
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тАО06-22-2006 09:13 PM
тАО06-22-2006 09:13 PM
Re: vfast on clusters
> The system is two clustered ES80 running Tru64 5.1 PK5
That should be Tru64 5.1b PK5
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тАО06-22-2006 10:28 PM
тАО06-22-2006 10:28 PM
SolutionAt least that is what a small experiment showed. And that's what would make sense too.
So it doesn't matter where you give the command, but the activity will be on the node that is the CFS server.
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тАО06-23-2006 12:44 AM
тАО06-23-2006 12:44 AM
Re: vfast on clusters
What triggered my question is that I started to see, on one node, one of the kernel threads use close to 100% CPU (as shown by ps -o pcpu -m -p "kernel-pid"). This started a short time after I activated vfast and enabled defragment.
After playing around with the cfs SERVER attribute for the file systems and deactivating/reactivating vfast on the domains everything seems to be back to normal.
Any known bugs related to vfast in 51b PK5?
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тАО06-23-2006 12:51 AM
тАО06-23-2006 12:51 AM
Re: vfast on clusters
If you want to make sure, you could load pfm (sysconfig -c pfm) and then run kprofile. If the top routines are in the msfs space, then it's AdvFS.
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тАО06-23-2006 07:11 PM
тАО06-23-2006 07:11 PM
Re: vfast on clusters
After stopping vfast on 2 of the domains everything went back to normal. (CPU usage for "kernel idle" back to 20-25%)
I did run kprofile and there are a couple of "msfs" routines high up in the list. The results from both with and without the problem are in the attached file.
(I will raise a support case through our local support company)
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тАО06-23-2006 07:29 PM
тАО06-23-2006 07:29 PM
Re: vfast on clusters
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тАО06-23-2006 07:40 PM
тАО06-23-2006 07:40 PM
Re: vfast on clusters
If the system is supposed to use only "idle" time to run vfast, I would expect the %CPU of the "kernel idle" process to stay the same before and after deactivating vfast.
What happened is that it went from 105% to 25%.
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тАО06-23-2006 07:53 PM
тАО06-23-2006 07:53 PM
Re: vfast on clusters
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тАО06-23-2006 08:10 PM
тАО06-23-2006 08:10 PM
Re: vfast on clusters
If I understand you correctly, vfast is supposed to use only othewise idle time to do its work. So, the %CPU of "kernel idle" should not change between vfast running on three domains or on a single one, and either the system would be "idle doing nothing" or "idle doing vfast".
Do I miss something here?