2.5 Data Storage Requirements
Users are reminded to consider the large size of counts and flt files when allocating disk space for storing and reprocessing COS data. Additionally, corrtag files with a large number of events can be quite large. These images serve as intermediate or final calibration products from the pipeline and have the file sizes given in Megabytes in Table 2.13. Note that these sizes are per exposure, and an associated observation set may have several exposures.
Table 2.13: COS Pipeline Data Volumes per Exposure.
File Type | FUVA | FUVB | Total FUV | Total NUV | Calibrated File |
|---|---|---|---|---|---|
| 9 bytes per photon | 9 bytes per photon | 9 bytes per photon (20 MB per buffer dump) | 8 bytes per photon (18 MB per buffer dump) | |
| 39 bytes per photon | 39 bytes per photon | 39 bytes per photon (87 MB per buffer dump) | 26 bytes per photon (58 MB per buffer dump) | • |
| 64 MB | 64 MB | 128 MB | 2 MB | |
| 160 MB | 160 MB | 320 MB | 10 MB | • |
| 0.5 MB1 | 0.5 MB1 | 1 MB2 | <1 MB | • |
| N/A | N/A | N/A | 10 MB | • |
| 160 MB | 160 MB | 320 MB | 10 MB | • |
| 0.5 MB | 0.5 MB | 1 MB2 | <1 MB | • |
| N/A | N/A | <1 MB | <1 MB | • |
1 Values pertain to x1d_a or x1d_b files only. These files are temporary output products from calcos processing.
2 Values are in addition to amounts given for each segment.
Similarly, users are reminded of the large cumulative size of calibrated COS spectroscopic datasets. Table 2.14 provides volume estimates for calibrated COS datasets.
Table 2.14: COS Pipeline Data Volumes per Calibrated Exposure.
| Detector | FUV | NUV | ||
|---|---|---|---|---|
Observation Mode |
|
|
|
|
Pipeline-processed volume per exposure | 650 MB | 775 MB | 25–35 MB | 25–35 bytes |
Standard calibrated files1 | 325 MB | 325 MB | 15–25 MB | 15–25 MB |
1 Minimum volume delivery option over the internet.
2 Approximately 70 MB per BUFFER-TIME.
3 Approximately 52 MB per BUFFER-TIME.