From: Goffredo Baroncelli <kreijack@gmail.com>
To: Harald Glatt <mail@hachre.de>
Cc: Hugo Mills <hugo@carfax.org.uk>,
Martin Steigerwald <Martin@lichtvoll.de>,
linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH 0/5] [RFC] RAID-level terminology change
Date: Sun, 10 Mar 2013 23:59:56 +0100 [thread overview]
Message-ID: <513D106C.4000806@gmail.com> (raw)
In-Reply-To: <CAFWF=amgMRcBaoTXZiFSEQnJkmayf7SPXddktbGuvN0q3qd7UA@mail.gmail.com>
On 03/10/2013 10:45 PM, Harald Glatt wrote:
> I've noticed through my own tests that on a single device I can
> corrupt around 5% of the data completely before btrfs fails. Up to
> that point both filesystem as well as data integrity stays at 100%.
> However the default layout for one disk seems to be having the data
> once, the metadata DUP and the system DUP too.
How make you the corruption ? Does btrfs return wrong data ? How is
calculated the 5% ?
> Having these 5% isn't
> mentioned anywhere... Is this a value that could maybe be manipulated
> and could it be introduced into a naming scheme like this? Also where
> do the 5% redundancy come from?
On a single device, the metadata are DUPlicated but the data have only 1
copy.
This means that if you corrupt the 1 copy of the metadata, btrfs
survives using the other copy. Instead if you corrupt the data btrfs
return an error.
> --
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>
--
gpg @keyserver.linux.it: Goffredo Baroncelli (kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D 17B2 0EDA 9B37 8B82 E0B5
next prev parent reply other threads:[~2013-03-10 22:00 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-09 20:31 [PATCH 0/5] [RFC] RAID-level terminology change Hugo Mills
2013-03-09 20:31 ` [PATCH 1/5] Use nCmSpP format for mkfs Hugo Mills
2013-03-09 20:31 ` [PATCH 2/5] Move parse_profile to utils.c Hugo Mills
2013-03-09 20:31 ` [PATCH 3/5] Convert balance filter parser to use common nCmSpP replication-level parser Hugo Mills
2013-03-09 20:31 ` [PATCH 4/5] Change output of btrfs fi df to report new (or old) RAID names Hugo Mills
2013-03-09 20:31 ` [PATCH 5/5] Add man page description for nCmSpP replication levels Hugo Mills
2013-03-10 14:01 ` Goffredo Baroncelli
2013-03-10 17:20 ` Hugo Mills
2013-03-10 17:52 ` Goffredo Baroncelli
2013-03-09 21:38 ` [PATCH 0/5] [RFC] RAID-level terminology change Harald Glatt
[not found] ` <CAFWF=am4ki529Zez4123gYk3BD+Z9RONRpAK7NZe=skHzcdMiw@mail.gmail.com>
2013-03-09 21:46 ` Hugo Mills
2013-03-09 22:25 ` Roger Binns
2013-03-10 1:44 ` Hugo Mills
2013-03-10 5:41 ` Roger Binns
2013-03-10 6:29 ` Harald Glatt
2013-03-10 6:37 ` Harald Glatt
2013-03-10 11:31 ` Martin Steigerwald
2013-03-10 11:48 ` Roger Binns
2013-03-10 22:04 ` Hugo Mills
2013-03-11 0:21 ` Roger Binns
2013-03-27 4:27 ` Brendan Hide
2013-03-27 5:24 ` Roger Binns
2013-03-10 11:23 ` Martin Steigerwald
2013-03-10 14:11 ` Goffredo Baroncelli
2013-03-10 21:36 ` Hugo Mills
2013-03-10 21:45 ` Harald Glatt
2013-03-10 22:59 ` Goffredo Baroncelli [this message]
2013-03-10 22:06 ` Harald Glatt
2013-03-10 23:06 ` Diego Calleja
2013-03-10 15:43 ` Goffredo Baroncelli
2013-03-10 22:24 ` Hugo Mills
2013-03-10 22:42 ` Harald Glatt
2013-03-10 23:40 ` sam tygier
2013-03-10 23:49 ` Hugo Mills
2013-03-11 14:14 ` David Sterba
2013-03-10 23:55 ` sam tygier
2013-03-11 8:56 ` Hugo Mills
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