HP Integrity NonStop Service Information Bedienungsanleitung PDF herunterladen (Seite 7)

DP2 FCHECK User’s Guide August 25, 2005

Hewlett-Packard Development Company L.P.

NTL Support and Service Library

6. Disk Scan Checks

When you use the –SCAN option, the validation examines the data on

both drives of the mirrored pair and ensures that the blocks have valid

checksums. If both the primary and mirror drives contain invalid

checksums, an error is reported for the file in question. If one drive has a

valid checksum and the other drive has an invalid checksum, the good

data is rewritten to the drive with the invalid data and the checking

continues. If neither drive contains invalid checksums, the data is

compared and any mismatch results in an error reported to the user,

which identifies the location of the mismatch.

To limit the scan to the primary or the mirror drive, use the –PRIMARYSCAN

or –MIRRORSCAN option in the place of the –SCAN option. When you

specify either of these options, the scan validates checksums on the

specified drive. If the other drive is available, it is used for checksum error

recovery if the checksum is valid on that drive.

When you use the –FASTSCAN option, the validation only compares the

data on the two drives of the mirrored pair. Any mismatch is reported to

the user.

You can specify –FULLSCAN to perform both scan validation and data

validation. When you use –FULLSCAN, the scan validation is performed

first, followed by the structure validation.

Note: Neither the –SCAN nor the –FASTSCAN option performs the

structured data validation.

Scan validation is performed for all file types, including unstructured files.

FCHECK errors displayed during a scan validation include:

Checksum 300

Medium 311

Compare 313

FCHECK might also report other errors, but they are typically related to

path loss or a down drive. Check Event Management Service (EMS) logs

for disk subsystem events related to such errors.

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HP Integrity NonStop Service Information Bedienungsanleitung Seite 7