* [9fans] duplicate scores in venti arenas
@ 2024-06-22 12:51 wb.kloke
2024-07-02 16:29 ` [9fans] " wb.kloke
0 siblings, 1 reply; 3+ messages in thread
From: wb.kloke @ 2024-06-22 12:51 UTC (permalink / raw)
To: 9fans
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Working on my data set, I found that there are several duplicate entries in the arenas.
I am confident that the data are consistent, though.
Which may be the circumstances, that this happens more than 1 time?
The arenas have been written by p9p venti server on my wdmycloud NAS.
Perhaps I should look at the times, when the blocks have been written.
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* [9fans] Re: duplicate scores in venti arenas
2024-06-22 12:51 [9fans] duplicate scores in venti arenas wb.kloke
@ 2024-07-02 16:29 ` wb.kloke
2024-07-06 20:01 ` wb.kloke
0 siblings, 1 reply; 3+ messages in thread
From: wb.kloke @ 2024-07-02 16:29 UTC (permalink / raw)
To: 9fans
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I now have a vague idea, what may have happened.
The really strange thing is that I did not write to this venti at all (at least not intentionally).
Now I tried to repair the config by deleting the last arena parttion, reformat a new one and buildindex from scratch.
After some time, when I used venti/copy to copy a tree to another venti, the last partition filled up again.
I noticed that the venti.conf stored in the first arena partition was not actualised. Is this the cause of the strange behaviour?
The http storage and index listings showed nothing which could alert me.
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* [9fans] Re: duplicate scores in venti arenas
2024-07-02 16:29 ` [9fans] " wb.kloke
@ 2024-07-06 20:01 ` wb.kloke
0 siblings, 0 replies; 3+ messages in thread
From: wb.kloke @ 2024-07-06 20:01 UTC (permalink / raw)
To: 9fans
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The main reason for the remaining mventi issues were, that I ignored the message about clump miscalculation in one arena. Why it is not really destructive in the original venti, I don't know.
So, if this message occurs, mventi will not serve the venti protocol.
Clump miscalculation indicates that the arena directory is not in sync with arena content. As the arena directory is only used for index rebuild and some external utilities, the most conservative option seems to delay the build of the directory till sealing of the arena. This avoids also useless writes to the arena partitions for the sake of SSD wear.
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