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тАО02-02-2009 12:43 PM
тАО02-02-2009 12:43 PM
Recreating a CMS library
--
Brian Tillman
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тАО02-02-2009 01:01 PM
тАО02-02-2009 01:01 PM
Re: Recreating a CMS library
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тАО02-02-2009 01:04 PM
тАО02-02-2009 01:04 PM
Re: Recreating a CMS library
--
Brian Tillman
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тАО02-02-2009 04:24 PM
тАО02-02-2009 04:24 PM
Re: Recreating a CMS library
Grab the DBS_PATCH package and use the PATCH_DISK
utility to do the read/write that Jess is talking
about...
It is quite simple and I have used it a number of
times.
If you need any assistance with it I am available
at dbsneddon at bigpond dot com
Dave
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тАО02-02-2009 06:48 PM
тАО02-02-2009 06:48 PM
Re: Recreating a CMS library
The brute-force approach is to rewrite the bad block, which is what the other replies here point to. The data may well be bad; as mentioned below, the block-level ECC is flagging this.
I'd probably just try to use BACKUP to copy the file, and then RENAME the files around so that the copy was the current file. When the file gets deleted and/or rewritten, the block will be replaced.
There is a disk error here. These might be an occasional lost block, or this disk could be seeing additional problems. And volume shadowing or RAID is the only way to recover a block error.
" BACKUP is telling you that there might well be an error in the data
stored in the specific original disk sector involved -- this flag
indicates that BACKUP was not able to reliably read the data from
the disk, and flags the potential corruption.
Rewriting the faulty disk sector will trigger automatic bad block
recovery, and a good block will replace the faulty block."
"$ HELP/MESSAGE FORCEDERROR
FORCEDERROR, forced error flagged in last sector read
Facility: SYSTEM, System Services
Explanation: This message applies only to devices governed by the mass
storage control protocol (MSCP). The data in this sector is
copied from another sector that had unrecoverable read errors.
This data is written with the Forced Error Indicator set to
show subsequent readers that the data is questionable.
User Action: Be aware that the contents of the sector are only a close
approximation of the data. Use the Backup utility to make a
copy of the original file and recover its contents."
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тАО02-03-2009 08:44 AM
тАО02-03-2009 08:44 AM
Re: Recreating a CMS library
> I'd probably just try to use BACKUP to
> copy the file, and then RENAME the files
> around so that the copy was the current
> file. When the file gets deleted and/or
> rewritten, the block will be replaced.
So even though BACKUP complains, if the file is actually good, as seems to be indicated by the ability to use the CMS library and to verify the library, that the copied file should work, correct?
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тАО02-03-2009 09:17 AM
тАО02-03-2009 09:17 AM
Re: Recreating a CMS library
Anything that reads from that block will get the bad data. (Though I do hesitate to write "gets the same bad data" there. Different readers could well get different bad data.) BACKUP is simply telling you it got bad data. Whether or not the bad data or the bad block is relevant here is another discussion; there are cases where bit errors that don't matter can arise. On the other hand, bit errors can slam you. (The most recent data I've seen on reliability points to an average of three to six of these errors per terabyte, too.)
The above assumes the absence of a BACKUP bug.
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тАО02-03-2009 09:22 AM
тАО02-03-2009 09:22 AM
Re: Recreating a CMS library
http://64.223.189.234/node/1115
http://64.223.189.234/node/838