Hp StoreAll Storage User Manual download pdf (Page 156)

KICKOFF_TIME=Wed Jul 18 05:18:12 2012

STOP_TIME=Mon Jul 23 14:36:59 2012

NUM_JOB_ERRORS=0

NUM_FILES_VALIDATED=1000000

NUM_FILES_SKIPPED=0

NUM_CONTENT_INCONSISTENCIES=0

NUM_METADATA_INCONSISTENCIES=0

Viewing and comparing hash sums for a file

If a validation scan summary file reports inconsistent hash sums for a file and you want to investigate

further, use the showsha (SHA test utility) and showvms (Validation Express Query lookup utility)

commands to compare the current hash sums with the hash sums that were originally calculated

for the file.

The showsha command calculates and displays the hash sums for a file. For example:

# /usr/local/ibrix/sbin/showsha rhnplugin.py

Path hash: f4b82f4da9026ba4aa030288185344db46ffda7b

Meta hash: 80f68a53bb4a49d0ca19af1dec18e2ff0cf965da

Data hash: d64492d19786dddf50b5a7c3bebd3fc8930fc493

The showvms command displays the hash sums stored for the file. For example:

# /usr/local/ibrix/sbin/showvms rhnplugin.py

VMSQuery returned 0

Path hash: f4b82f4da9026ba4aa030288185344db46ffda7b

Meta hash: 80f68a53bb4a49d0ca19af1dec18e2ff0cf965da

Data hash: d64492d19786dddf50b5a7c3bebd3fc8930fc493

last attempt: Wed Dec 31 17:00:00 1969

last success: Wed Dec 31 17:00:00 1969

changed: 0

In this example, the hash sums match and there are no inconsistencies. The 1969 dates appearing

in the showvms output mean than the file has not yet been validated.

Handling validation scan errors

When a validation scan detects files having hash values inconsistent with their original values, it

displays an alert in the events section of the GUI. However, the alert lists only the first inconsistent

file detected. It is important to check the validation summary report to identify all inconsistent files

that were flagged during the scan.

When there are inconsistencies, it is necessary to determine whether the cause is file corruption

or checksum corruption. Compare the file checksum with the backup file:

/usr/local/ibrix/sbin/showsha <fileFromBackup>

Checksum corruption:

If the checksums of the <filesystem/file> and <fileFromBackup> are identical, the

.archiving directory may have been corrupted (a checksum corruption). If this is the case, you

must restore the checksums:

• If only a few files are inconsistent and you want to postpone restoring the checksums, you can

back up the files with a checksum inconsistency, delete those files from the file system, and

restore the backed up files to the file system.

• If many checksums are corrupted, there may be a hardware failure. To restore the checksums,

complete the following procedure:

IMPORTANT: This procedure should be performed only under the guidance of HP Support.

1. Create a backup of the existing .archiving directory for future reference.

2. Replace the faulty hardware.

156 Managing data retention

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