Re: Re: Can Archiver Appliance Store 50Hz Waveform Data?

[Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>]

On Tue, 8 Jul 2025 at 06:29, lvhh at sari.ac.cn <lvhh at sari.ac.cn> wrote:

The BPM waveform size is 1024*4, with a sampling rate of 50Hz.

That's 4kByte per update - or do you mean 1024 * 4 doubles = 32kByte?

Assuming 32kByte @ 50Hz that would be ~1.6MByte/s, which comfortably fits on a 100MBit connection. Network bandwidth is not an issue.

 

The waveform data is stored using 'aa'. I've tested it at 10Hz, and it stores normally, but I haven't tried 50Hz—I'm not sure if it can store that fast.

Assuming your AA is running on a server-type machine with enough memory and a fast disk, I would not expect an issue.

But you should definitely test this: Run an IOC where a thread creates fake data in a waveform record of the required size. Make the fake data a pattern that allows you to easily detect a missing update in the archived data (like a counter). Let it run and archive for a day, then increase the rate, until you see updates missing. As long as your production setup stays well below that tested limit, you're good.

Cheers,
~Ralph