----- Original Message -----
From: "Jay Shaughnessy" <jshaughn(a)redhat.com>
To: rhq-devel(a)lists.fedorahosted.org
Sent: Monday, July 15, 2013 4:24:00 PM
Subject: Re: Storage Node - Disk Space Metric
On 7/15/2013 4:46 PM, Stefan Negrea wrote:
>
> ----- Original Message -----
>> From: "Jay Shaughnessy" <jshaughn(a)redhat.com>
>> To: rhq-devel(a)lists.fedorahosted.org
>> Sent: Monday, July 15, 2013 11:34:51 AM
>> Subject: Re: Storage Node - Disk Space Metric
>>> 1) Should we include both metrics? Overall disk space use & data files
>>> disk
>>> space used? We could only hope that having the two metrics will make it
>>> easier for users to understand what they are.
>> I think two metrics is a good idea. We must have a way to easily alert
>> on a disk space consumption. The Iteration-3
>> Calculated.PartitionDiskSpaceUsedPercentage metric is useful
>> information: How much of my used disk space is due to my storage node?
>> But it's mainly useful to help understand if a disk space issue is or is
>> not due to the storage node. We need the Iteration-3
>> Calculated.PartitionDiskSpaceUsedPercentage metric for alerting on
>> excessive disk space for the storage node partitions. Of course we'd
>> need two names that describe the distinction. I think both metrics
>> should be on the same resource as they are related.
>>
> If we put the two metrics on the same resource (Cassandra Storage Service)
> how could we prevent confusion over the meaning of the two metrics?
>
> How about these two names: Calculated.DataDiskSpaceUsedPercentage &
> Calculated.SystemDiskSpaceUsedPercentage
Those names aren't bad. I think the descriptions will be important.
Making sure to point out that 'SystemDiskSpaceUsedPercentage' represents
the file system for which data is being written and is equal to (
'DataDiskSpaceUsedPercentage' + non-storage node data).
The name is very important because there is no description on the metrics values tab. The
description is shown only on the Schedules tab (I think that is what prompted John's
concerns).
John, having the two metrics on the same resource will make it somewhat intuitive that the
high percentage is not the space used by Cassandra.
>
>
> Thank you,
> Stefan Negrea
> _______________________________________________
> rhq-devel mailing list
> rhq-devel(a)lists.fedorahosted.org
>
https://lists.fedorahosted.org/mailman/listinfo/rhq-devel
_______________________________________________
rhq-devel mailing list
rhq-devel(a)lists.fedorahosted.org
https://lists.fedorahosted.org/mailman/listinfo/rhq-devel