The dCache statistic pages allow an insight into
the distribution of the different storage classes among the
dCache pools and the amount of data flowing into the pools from the
HSM as well as the amount of data fetched by the clients from the pools.
The numbers are calculated per day from midnight to midnight, except for
the most recent day where we compare midnight against the
the last full hour. For each day we provide the total amount of data
at the beginning of the day, at its end (midnight), the data which
has been flown into the pools from the HSM and the amount which has been
fetched by the clients. This numbers are given for all pools, for all
storage classes, for all storage classes within each pool and for
all pools occupied by a specified storage class as well as the
total daily amount for all pools and storage classes.
A typical table is given below. Each table entry corresponds to
a day, a storage class or a pool. (Here denoted a <key>).
An entry uses three different ways to represent
the four different values described above.
The values and colors are :
- GREEN The data amount when the day began
- VIOLET The amount of data which had been added during this day
- RED The data mount when the day ended and
- YELLOW The amount of data which had been fetched by dCache clients.
The display methods are :
- A bar diagram using the same normalization for each entry
in the table, making them comparable.
- The actual numbers in MBytes.
- Another bar diagram where each entry in the table is
individually normalized to 1.