Data Domain DD400 Series, User Manual

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Chapter 9: File System Management 81
Statistics and Basic Operations
Display File System Space Utilization
The display shows the amount of space available for and used by restorer file system components.
•
The /ddvar line gives a rough idea of the amount of space used by and available to the log and
core files. Remove old logs and core files to free space in this area.
•
The Pre-compression line shows the amount of virtual data stored on the restorer. Virtual data
is the amount of data sent to the restorer from backup servers. Do not expect the amount shown
in the
Pre-compression line to be the same as the amount displayed with the
filesys show
compression
command, Original Bytes line, which includes system overhead.
•
The Data line shows the actual physical space used by and available for data storage. Warning
messages go to the system log and an email alert is generated when the Use% figure reaches
90%, 95%, and 100%. At 100%, the restorer accepts no more data from backup servers. You
must run a
filesys clean
operation to reclaim disk space. If Use% is always high, use the
filesys clean show-schedule
command to see how often the operation runs
automatically, then use
filesys clean schedule
to run the operation more often.
Also consider reducing the data retention period or splitting off a portion of the backup data to
another restorer.
•
The If 100% cleaned line is an estimate of actual physical space used, and physical space
available for data storage if you run the
filesys clean start all
operation to clean
100% of the file system. The estimate is based on the most recent
clean
operation. On a
replica, no estimate appears.
•
The Meta Data line tracks space used for the internal file descriptions that the restorer creates
for all stored files. Warning messages go to the system log and an email alert is generated
when the
Use% figure reaches 90%, 95%, and 100%. At 100%, the restorer accepts no more
data from backup servers. From the backup server, you must expire or purge backup images to
create free space for meta data.
•
The Index line tracks space used for internal restorer operations. Warning messages go to the
system log and an email alert is generated when the Use% figure reaches 90%, 95%, and
100%. At 100%, the restorer accepts no more data from backup servers. To create free space
for the index:
- From the backup server, expire or purge backup images.
- On the restorer, run the
filesys clean start
operation.
•
The Estimated compression ratio line gives a rough idea of data compression efficiency. The
estimate is based on the most recent
clean
operation and changes if the compressibility of
data sent to the restorer changes. Note that the compression calculation includes the metadata
and index space as part of the total storage space. On a replica, no estimate appears.
•
The Estimate based on line displays the date for the most recent clean operation. The date is in
the format YYYY/MM/DD .