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DP2 FCHECK User’s Guide
August 25, 2005
2. Data Scrubbing
As a general guideline, run FCHECK periodically to ensure that data is
valid and consistent. You can initiate FCHECK routinely during nonpeak
periods to cover entire volumes or limit it to critical data sets.
When you run the FCHECK utility without a --SCAN option, and without the
--SIZE option, a full validation of the structures is performed for any target
structured files. The validation is typically performed in response to certain
application errors, especially error 59 and includes key-sequenced B-tree
consistency and block header and trailer validation. Data scrub can be
an intense operation, requiring significant CPU and I/O cycles to validate
the data. Consider disk scrub for routine scrubbing requirements, with ad-
hoc or less routine data scrub to validate key data sets.
FCHECK also allows you to validate unstructured files with data scrub to
ensure that such files are readable. Use disk scrub instead if the only files
in the set are unstructured files.
3. Disk Scrubbing
For mirrored volumes, HP recommends using the –SCAN option for
periodic disk scrubbing. You can use NETBATCH or a similar product that
automatically initiates one or more FCHECK validation scan operations
during nonpeak periods. For example, you might execute this command
for key disk volumes once each night or weekend:
FCHECK –SCAN –FINDBAD –VOL $DATA
HP strongly recommends that you perform the scan before you remove
(SCF STOP) one-half of a mirrored pair. In addition to the –SCAN option,
FCHECK supports the –SCANPRIMARY and –SCANMIRROR options:
FCHECK –SCANMIRROR –FINDBAD –VOL $DATA
If a checksum error is detected on the specified drive, the driver attempts
to read the data on the nonscanned drive. If that data has a valid
checksum, the driver automatically rewrites the data to the drive with the
defective data. Otherwise, the scan does not read the data on the drive
that was not specified.
Hewlett-Packard Development Company L.P.
3 of 13 NTL Support and Service Library
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