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File Layout

FMDS stores data using multiple archive files. These files are stored in the following directory: <rootdrive>:ttdatfilesfmdssafe

FileDescription

SafeStore.dat

A database that stores all of the data collected by FMDS. When FMDS is running, this is a read-only file.

Warm.h5

A file that stores accumulated FMDS data. FMDS flushes accumulated data to this file every five minutes or every 250000 records, whichever comes first.

Like the SafeStore.dat, the Warm.h5 file is a read-only file. It will only be writable by the automatic flushing process

Warm.h5.backup

A backup file FMDS creates prior to flushing the accumulated data to the Warn.h5 file to ensure data is not lost.

archive_YYYY-MM-DD-000n.h5

An archived file FMDS creates once the Warm.h5 exceeds 150MB (by default). A typical archive file name is: archive_2009-05-04-0002.h5, which is the second archive created on May 4, 2009.

Archive files are never opened writable except when deleting stores using FMDSFileMonkey.