Invalid block headers backup to a Quantum VTL with dedup enabled

Troubleshooting

Problem

Invalid block header errors received when using a Quantum VTL with Quantum instream dedup enabled.

Symptom

ANR9999D_1464158388 ComBlockHeaderValid(pvrgts.c: 6287) Thread<355355>: Invalid block header read from volume volname. (magic=0000, ver=0, Hdr blk=0 <expected ####>)

The magic, ver and HDR blk values were all reported as 0.

Environment

Quantum DXi8500 VTL Firmware 2.1.0 (6552-44258 Build40) with Quantum dedup enabled.

Resolving The Problem

Update write_max_sync_delay=3600000 in /opt/DXi/bpw/bin/bpwutil

In /etc/init.d/bpwd Add the following to the TUNABLES
-Xwrite_max_sync_delay=3600000

The original setting was 5000 milliseconds. This value controls when bpwd will decide that blockpool is taking too long to write a page and will therefore write to the commit log instead.

[{"Product":{"code":"SSGSG7","label":"Tivoli Storage Manager"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Server","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF016","label":"Linux"}],"Version":"All Supported Versions","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}}]

Historical Number

1638410

Product Synonym

IBM Spectrum Protect

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Document Information

Modified date:
17 June 2018

UID

swg21982881

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