Shadow set problem finally solved

Well, I have posted about a shawdow set problem that I had: Hard
errors in the error log only during a shadow set merge or ANAL/DISK/
SHAD that were apparently not in blocks allocated to files.

This is a 2 disk shadowset on a DS10 running 7.3.2.

I got 2 new disks to replace the old ones.

I swapped out one disk and merged it in. But I got the same errors on
the new disk at exactly the same LBAs!

Then I swapped the other disks and merged it in. I got the same
errors on it at the same LBAs!

To be exact, I get a few more errors on the source disk for the merge,
probably due to retries, but all at the same 4 LBAs on both disks.

Here's what I think happened: Had one bad disk that had parity errors
(or a glitch that established some parity errors). Once those errors
were established, they are just copied from disk to disk every time I
merged a shadowset.

One thing I don't know is why ANAL/DISK/SHAD/BLOCKS=FILE hits these
parity errors, since all other tests indicate that the reported LBAs
are not in a file. ANAL/DISK/READ reported no errors, and DFU
indicates that the LBAs are not in a file.

To get rid of these errors I am in the process of trying this:

1. Broke a disk out of the shadow set and did an image save and
compress on it.

2. Booted on that disk and remerged the shadow set.

That merge is in progress. I will see if I have any errors on it.
.

Relevant Pages

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