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From: Jonas Schnelli <dev@jonasschnelli.ch>
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Date: Mon, 25 Jan 2016 17:12:01 +0100
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Subject: Re: [bitcoin-dev] Bitcoin Core 0.12.0 release candidate 1 available
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
> Why is the minimum storage quota of 550 MiB necessary for pruning
> nodes if the block data is not served to other nodes ? Could the
> client just do transaction verification and transaction relaying
> and only keep the block(s) being verified on disk ?
>
We try to allow reorgs ~288 blocks deep also in pruning:
- From code comments:
Require that user allocate at least 550MB for block & undo files
(blk???.dat and rev???.dat)
At 1MB per block, 288 blocks = 288MB.
Add 15% for Undo data = 331MB
Add 20% for Orphan block rate = 397MB
We want the low water mark after pruning to be at least 397 MB and
since we prune in
full block file chunks, we need the high water mark which triggers the
prune to be
one 128MB block file + added 15% undo data = 147MB greater for a total
of 545MB
Setting the target to > than 550MB will make it likely we can respect
the target.
</jonas>
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