From: Goffredo Baroncelli <kreijack@gmail.com>
To: Martin Steigerwald <Martin@lichtvoll.de>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH 0/5] [RFC] RAID-level terminology change
Date: Sun, 10 Mar 2013 15:11:40 +0100 [thread overview]
Message-ID: <513C949C.6080009@gmail.com> (raw)
In-Reply-To: <201303101223.56805.Martin@lichtvoll.de>
Hi Martin,
On 03/10/2013 12:23 PM, Martin Steigerwald wrote:
> Hi Hugo,
>
> Am Samstag, 9. März 2013 schrieb Hugo Mills:
>> Some time ago, and occasionally since, we've discussed altering the
>> "RAID-n" terminology to change it to an "nCmSpP" format, where n is the
>> number of copies, m is the number of (data) devices in a stripe per copy,
>> and p is the number of parity devices in a stripe.
>>
>> The current kernel implementation uses as many devices as it can in
>> the striped modes (RAID-0, -10, -5, -6), and in this implementation,
>> that is written as "mS" (with a literal "m"). The mS and pP sections are
>> omitted if the value is 1S or 0P.
>>
>> The magic look-up table for old-style / new-style is:
>>
>> single 1C (or omitted, in btrfs fi df output)
>> RAID-0 1CmS
>> RAID-1 2C
>> DUP 2CD
>
> What does the "D" in "2CD" mean? Its not explained above, unless I miss
> something.
This means DUP (two copy on the same disk); I understand that only
reading the code.
>
>
--
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 14:10 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 [this message]
2013-03-10 21:36 ` Hugo Mills
2013-03-10 21:45 ` Harald Glatt
2013-03-10 22:59 ` Goffredo Baroncelli
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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