When I start venus ,it can't get root volume name.And I don't know 
why it happens.the output is as following:
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 09:27:13 /usr/coda/LOG size is 548342 bytes
09:27:13 /usr/coda/DATA size is 2193368 bytes
09:27:13 Initializing RVM data...
09:27:13 ...done
09:27:13 Loading RVM data
09:27:13 starting VDB scan
09:27:13        1 volume replicas
09:27:13        0 replicated volumes
09:27:13        0 CML entries allocated
09:27:13        0 CML entries on free-list
09:27:13 starting FSDB scan (833, 20000) (25, 75, 4)
09:27:13        0 cache files in table (0 blocks)
09:27:13        833 cache files on free-list
09:27:14 starting HDB scan
09:27:14        0 hdb entries in table
09:27:14        0 hdb entries on free-list
09:27:14 Kernel version ioctl failed.
09:27:14 Initial LRDB allocation
09:27:14 Getting Root Volume information...
09:27:29 GetRootVolume: can't get root volume name!

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   Does someone can give me some suggestion?
   Thanks!
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