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A bug in the algorithm?

 
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Quark



Joined: 05 Jul 2005
Posts: 4

PostPosted: Tue Jul 05, 2005 8:45 pm    Post subject: A bug in the algorithm? Reply with quote

Please read the topic by Andrzej Komisarski in PAR discussion forum, ICE ECC also fail on this sets
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ICE Graphics
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Joined: 31 Mar 2003
Posts: 430

PostPosted: Wed Jul 06, 2005 8:47 am    Post subject: Re: A bug in the algorithm? Reply with quote

Quark wrote:
Please read the topic by Andrzej Komisarski in PAR discussion forum, ICE ECC also fail on this sets

1. This is algorithm instability are very rare. For real test i never could cause what problem.
2. ICE ECC for header recovering using special algorithm witch is immune to this is instability.
3. v1.4 has a lot of new features. So, what algorithm for data recovery would be added later.
4. It's easy to solve problem with algorithm instability manually, if it occur. Just add new defect to data files.
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Quark



Joined: 05 Jul 2005
Posts: 4

PostPosted: Wed Jul 06, 2005 11:30 pm    Post subject: Reply with quote

Quote:
So, what algorithm for data recovery would be added later.
можно это по-русски и по-подробнее? (наверно имелось ввиду "that algorithm"?)

И есть ли вероятность исправить эту проблему, чтобы можно всегда было восстановить N поврежденных частей, используя любые N блоков восстановления?

Еще хотелось бы видеть более понятное сообщение в таких случаях
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PostPosted: Thu Jul 07, 2005 8:00 am    Post subject: Reply with quote

Quark wrote:
Quote:
So, what algorithm for data recovery would be added later.
можно это по-русски и по-подробнее? (наверно имелось ввиду "that algorithm"?)

Есть русский форум для "по русски". Here is only English
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Quark



Joined: 05 Jul 2005
Posts: 4

PostPosted: Thu Jul 07, 2005 9:25 am    Post subject: Reply with quote

Can you specify more information about this algorithm?

And is there a probability to correct this problem that it was always possible to recover N damaged parts, using any N recovery blocks?

Still it would be desirable to see more clear message in such cases
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PostPosted: Thu Jul 07, 2005 9:44 am    Post subject: Reply with quote

Quark wrote:
Can you specify more information about this algorithm?

Selection random recovery blocks for recovery.

Quark wrote:
And is there a probability to correct this problem that it was always possible to recover N damaged parts, using any N recovery blocks?

Is possible to guarantee recover any N damaged blocks, using any N+1 recovery blocks. Of course this is worst case, algorithm instability case. In 99.9% cases is possible to recover N blocks using only N recovery blocks.

Quark wrote:
Still it would be desirable to see more clear message in such cases

I told you before, what in v1.4 algorithm instability fix occur only for header recovering. For data recovering it's not implemented yet.
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Quark



Joined: 05 Jul 2005
Posts: 4

PostPosted: Thu Jul 07, 2005 9:56 am    Post subject: Reply with quote

Thanks for reply, hope it will be implemented in v1.5
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PostPosted: Fri Jul 08, 2005 10:09 am    Post subject: Reply with quote

Done. Algorithm instability is fixed
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