Deleting your network trending data files
Network trending has the possibility to produce large amounts of data that it stores on your hard drive. If your trending files are large, you may want to implement a management strategy so that you have the information that you need for as long as you need it, but that you delete information you no longer need.
If you allow network trending data to accumulate without a deletion strategy, you could experience the following problems:
The operating system drive runs out of free space (or free space becomes too low) and no new trending data is collected.
System performance is severely degraded because not enough space is available to the Windows paging file to remain efficient, if it exists at all in your hardware configuration.
If this Observer/GigaStor is feeding Apex, Apex might not receive the latest trending data because Observer could no longer collect new network trending on the full disk drive.
Tip! Each network trending file can grow to a maximum of 4 TB.
By default, the trending files are kept for each trending instance in C:\Program Files\Observer\NetworkTrending. You can delete them using Windows Explorer.
Additionally, Observer can automatically delete old trending data for you when you set Delete oldest trending data on the probe... in Network Trending > Network Trending on the Home tab. Then choose Settings > General to find the option. When this option is set, you will virtually never need to worry about filling up the C: drive with too much network trending data. However, only the oldest two (2) files are deleted for each new trending file that is created. Because at least one new trending file is created each day, this means that each day when a new trending file is created, the two oldest network trending files are deleted. This is a net deletion of one (1) network trending file per day. The files are deleted at midnight UTC; this option is not configurable. (See the current UTC time and determine your offset.) You will want to set the amount of trending days retained to no more than you can store on the target disk drive. See How to determine disk space requirements for network trending.
The purpose of this design is to maintain disk write performance that might otherwise degrade if multiple, large deletions are made each day. Remember, you can delete trending files manually at any time from C:\Program Files\Observer\NetworkTrending, which is the default storage location. The automated tool operates with disk write performance as its highest priority—so it should be used—but if you are confident and wish to delete multiple network trending files manually through Windows, you can. Be aware that you risk negatively impacting the new, incoming network trending data being collected at the very same time as when multiple network trending files are being deleted through Windows Explorer.
If you are using Apex, you can safely delete the trending files after the data has been transferred to Apex. If you are not using Apex, then delete the trending files only if you are certain you no longer need the data.