How does DW Spectrum recycle recorded media?
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Related Digital Watchdog VMS Apps: DW Spectrum
Software Version: All Versions
Last Edit: August 23, 2024
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When does DW Spectrum overwrite data?
Storage Recycling is a required function to allow Spectrum to maintain recently recorded data.
If the available space of Local Disks/NAS/iSCSI is less than the reserved space(default 50GB), DW Spectrum will start to delete/clean the oldest files, allowing Spectrum to archive the data that is actively written.
When Server detects that the available space of the storage is less than the reserved space, meaning that there is no space for new files, DW Spectrum will delete the oldest 1-minute file, then check the space again, until there is enough space for new files.
DW Spectrum records raw files up to 1-minute length, while deleting the oldest 1-minute file to regain the free space. The recycling process happens every minute.
How much data is overwritten?
Since DW Spectrum will only overwrite old data at the rate new information is written, it will overwrite at the rate of the incoming data to be recorded.
This is dependent on variables such as the number of cameras as well as the bitrate. For example, if you have 100 cameras recording 8Mbps bitrate per camera -- you will have deleted ~ 600 MBs recycled per minute. DW Spectrum will recycle the size which is equal to the size recording coming into the storage. If the storage is full and the recording comes in with the size of 600 MB, then DW Spectrum will delete 600MB of your oldest footage to allot the necessary space for the new recordings.
Regardless of varied throughputs (for example, motion recording vs continuous), the process of archive recycling will maintain at the rate of the incoming data.
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