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Chapter 2: DXi6902 Service Menus
Blockpool Verify and Blockpool Corruption Actions
52
Quantum DXi6902 User’s Guide
N: Verifying cluster tree (fast) (3% complete)
4
When running a blockpool verification script, watch for the
following messages:
W: Cluster 107 contains corrupt data
5
This message when seen during a blockpool verification, indicates
that while checking the specified cluster, there was a discrepancy
between the stored CRC and the calculated CRC of some data in the
cluster, which could indicate bit rot. The corruption message
indicates that one or more blocklets are corrupted in a cluster. There
may be multiple clusters containing corrupted blocklets, in which
case you will see multiple messages.
Detecting Blob
Corruption
If blocklet corruptions are detected, you must find out which BLOBs (if
any) are affected by these corrupted blocklets.
1
At the command prompt type:
/hurricane/blockpool/bin/blockpool verify
+Dblob_datNlocal@localhost &
This operation takes some time to complete, but it can be done in
parallel with other operations. For example, if you've stored 100TB into
the blockpool, even if that has reduced to 10TB, the operation will still
take approximately = 3 days to verify if the system is idle.
The result of this BLOB data verify will be messages in the following
form:
BLOB <tag> is corrupt. <explanation>
These individual BLOB tags can then be mapped back to VTL carts or
NAS files (using deduputil). These carts or files are not able to be
retrieved (or replicated) until repaired, however they can be deleted.
If you see no corrupt BLOB messages (but you did see corrupt blocklet
messages), the corrupt blocklets are orphaned. For example, they are
not referenced by any BLOBs. In this case, there is nothing to do, it is
safe to leave them in the blockpool.
Summary of Contents for DXi6902
Page 1: ...Field Service Manual Quantum DXi6902 with DXi 3 0 0_69 Software 6 68164 01 Rev A...
Page 8: ...Contents viii Quantum DXi6902 User s Guide...
Page 16: ...Tables xvi Quantum DXi6902 User s Guide...
Page 24: ...Preface xxiv Quantum DXi6902 User s Guide...
Page 242: ...Appendix A DXi6902 Cabling Diagrams 218 Quantum DXi6902 User s Guide...