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Understanding the Monitor Servers Screen on the Web Console

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Tue, 07/19/2011 - 07:13
slath@citywire.co.uk
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Joined: 06/27/2011
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Hi,

I am just trying to get a better understanding of the Membase server monitor screen which I have attached a screenshot of below:

https://www.couchbase.org/forums/sites/default/files/u1001482/membase-se...

1. The first question is whether the details in the screenshot are Membase specific or are overall details for the servers/machines on which Membase is installed. i.e. is the SWAP usage figure referring to Membase or the machine?

2. Server 1 in the screenshot above has a ram usage that constantly sits above 95%. Is this something to worry about? It seems odd that server 2 is a lot lower and hovering around 70%. Both servers are identical spec, and cant see anything else running on one server that is not on the other.

The screenshot below shows that the cluster has just over 6GB RAM allocated to it. Both servers have 4GB RAM each. There is a large chunk of unallocated and unused memory on Membase. So I am not sure why server1 is sitting up at 90%...

https://www.couchbase.org/forums/sites/default/files/u1001482/membase-cl...

That all said, Membase still seems to be operating fine without any issue but any feedback on this will be appreciated

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Tue, 07/19/2011 - 15:19
perry
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Joined: 10/11/2010
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Hi there Slath, happy to help!

1 - It's a combination ;-) Swap/RAM/CPU usage are for the servers in general, items are Membase specific.
2 - The RAM usage can be a bit confusing sometimes. Linux will routinely use all of it's available RAM for cache/buffer. This doesn't mean that there's no RAM avialable, as that will be reclaimed when necessary. The reason for them being different has to do with the amount of network and disk IO traffic going on on each of them...nothing to be too concerned about.

I would be a bit more concerned with the swap usage, and would also recommend monitoring these systems via something other than Membase...cacti/nagios are good examples.

Let me know if that helps.

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