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# Overview of CondCore/CondHDF5ESSource
## CondHDF5ESSource
CondHDF5ESSource is an EventSetup source that can read conditions data from an HDF5 file. The full configuration options for the module can be obtained by doing the standard
```
> edmPluginHelp -p CondHDF5ESSource
```
In general, one will specify the file to read and the global tag stored within that file to use. E.g.
```python
globalTag = cms.ESSource("CondHDF5ESSource", filename = cms.string("JobConditions.h5cond"), globalTag = cms.string("SomeTag") )
```
## Utilities for creating an HDF5 conditions file
### conddb2hdf5.py
This utility reads from the conditions database and writes a specified global tag into to the file. The full range of options can be seen by doing
```
> conddb2hdf5.py --help
```
The simplest way to use the utlity is to specify a global tag and the output file name
```
> conddb2hdf5.py SomeTag --output JobConditions.h5cond
```
NOTE: it can take many hours to dump all the conditions from a global tag stored in the DB.
### condhdf5tohdf5.py
This utility reads from one hdf5 conditions file and writes a specified global tag into a new hdf5 file. The full range of options can be seen by doing
```
> condhdf5tohdf5.py --help
```
The simplest way to use the utlity is to specify the input file, a global tag and the output file name
```
> condhdf5tohdf5.py OriginaFile.h5cond SomeTag --output JobConditions.h5cond
```
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