Re: [Xen-API] Problems on retrieving performance statistics

[Frisco Ho <frisco.ho@xxxxxxxxxxxxxxxx>]

Hi Jonathan,

For question 2, Is there any way I can directly access to the RRD files on the host?

Your said: "No, they only exist in memory."

Just want to clarify, due to some reason if the host is shutting down unexpectedly.

1. Since the RRD are in the memory, those statistic will be lost?

2. When the host is recover, VM will try to load the back up in /var/xapi/blobs/rrds? or will start from scratch to accumulate new data?

Frisco Ho

On Wed, Sep 15, 2010 at 9:01 PM, Jonathan Ludlam <Jonathan.Ludlam@xxxxxxxxxxxxx> wrote:

Hi Frisco,

On 15 Sep 2010, at 03:50, Frisco Ho wrote:

Hi All,

I am a newbie on XEN API. I know that the API provide some way to gather xen cloud platform performance statistics.

Basically a http handler ( http://wiki.xensource.com/xenwiki/XAPI_RRDs ), however due to some reason I need to access the statistics on the local host running VM and do not want to use the http handler.

What I asking is:

1. Is there any CLI command that I can get the statistics just like the http handler

xe vm-data-source-query - but it's quite inefficient.

2. Is there any way I can directly access to the RRD files on the host?

No, they only exist in memory.

 

According to the Xen Cloud Platform SDK document, "RRDs are resident on the server on which the VM is running, or the pool master when the VM is not running. The RRDs are also backed up every day."

So where is the path of RRD exactly locate on the host?

They're stored in /var/xapi/blobs/rrds - but these are only for backup, and don't contain current data.

--
Frisco Ho

<ATT00001..txt>

Jon

--
Frisco Ho
Software Developer  | Bit Exchange Systems Ltd.
Unit 533, Building 9, Enterprise Place, Hong Kong Science Park, Shatin.

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