From: Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
To: Clemens Eisserer <linuxhippy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-nilfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: Does nilfs2 do any in-place writes?
Date: Wed, 15 Jan 2014 14:52:19 +0400 [thread overview]
Message-ID: <1389783139.3913.23.camel@slavad-ubuntu> (raw)
In-Reply-To: <CAFvQSYSzpX_WpUi9KpGj0pZvzhw2mfzzOqcgdj9ripXAjipmtw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
On Wed, 2014-01-15 at 11:44 +0100, Clemens Eisserer wrote:
> Hi,
>
> Recently my raspberry pi destroyed a 32GB SD card after only 4 days,
> because that cheap SD card seemed to have issues with wear-leveling.
> The areas where the ext4 journal was stored were no longer read- or writeable.
>
> I wonder which write-access patterns nilfs2 does exhibit.
> Are there any frequent in-place updates to statically positioned data
> structures (superblock, translation tables, ...) or is the data mostly
> written sequentially?
>
The main approach of NILFS2 is COW (copy-on-write) policy. It means that
all data and metadata are written in log manner. Only superblocks are
placed in fixed positions and updated there. First superblock is located
in the volume begin, second one in the volume end.
With the best regards,
Vyacheslav Dubeyko.
> Thank you in advance, Clemens
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next prev parent reply other threads:[~2014-01-15 10:52 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 10:44 Does nilfs2 do any in-place writes? Clemens Eisserer
[not found] ` <CAFvQSYSzpX_WpUi9KpGj0pZvzhw2mfzzOqcgdj9ripXAjipmtw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-15 10:52 ` Vyacheslav Dubeyko [this message]
2014-01-15 11:44 ` Clemens Eisserer
[not found] ` <CAFvQSYTG6HBVc9iodYyvCejwf889jiwOPsVb1Hi8cDrR9pOGeg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-15 12:01 ` Vyacheslav Dubeyko
2014-01-15 15:23 ` Ryusuke Konishi
[not found] ` <20140116.002353.94325733.konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2014-01-16 10:08 ` Vyacheslav Dubeyko
2014-01-17 22:55 ` Ryusuke Konishi
[not found] ` <20140118.075519.43661574.konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2014-01-20 11:54 ` [writable snapshots discussion] " Vyacheslav Dubeyko
2014-01-18 0:00 ` Ryusuke Konishi
[not found] ` <20140118.090008.194171715.konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2014-01-28 9:25 ` [static superblock discussion] " Vyacheslav Dubeyko
[not found] ` <1390901114.2942.11.camel-dzAnj6fV1RxGeWtTaGDT1UEK6ufn8VP3@public.gmane.org>
2014-01-29 12:44 ` Andreas Rohner
[not found] ` <52E8F7A7.8010505-hi6Y0CQ0nG0@public.gmane.org>
2014-01-29 13:19 ` Vyacheslav Dubeyko
2014-01-29 18:18 ` Clemens Eisserer
[not found] ` <CAFvQSYSu5CGxs+K6bZUCtq17PrS_paX3bXBuLBRTba_XWYGgAg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-30 2:46 ` [PATCH 0/1] nilfs2: add mount option that reduces super block writes Andreas Rohner
[not found] ` <cover.1391048231.git.andreas.rohner-hi6Y0CQ0nG0@public.gmane.org>
2014-01-30 2:47 ` [PATCH 1/1] " Andreas Rohner
[not found] ` <75ceb45c464097ab556baacf2d15d6ae4b792bb2.1391048231.git.andreas.rohner-hi6Y0CQ0nG0@public.gmane.org>
2014-01-30 6:36 ` Vyacheslav Dubeyko
[not found] ` <127C78C3-9D47-439C-9639-263BC453D98D-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-01-30 6:02 ` Andreas Rohner
[not found] ` <52E9EB06.1000504-hi6Y0CQ0nG0@public.gmane.org>
2014-01-30 7:44 ` Vyacheslav Dubeyko
[not found] ` <8DBE8E18-F678-44B0-A6A6-5AFEC227AA86-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-01-30 6:52 ` Andreas Rohner
2014-01-30 9:48 ` Andreas Rohner
[not found] ` <52EA2002.1030809-hi6Y0CQ0nG0@public.gmane.org>
2014-01-30 11:27 ` Vyacheslav Dubeyko
[not found] ` <A6830DB2-DC73-4ACC-BE73-7A6EC1AC7C18-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-01-30 11:33 ` Andreas Rohner
[not found] ` <52EA38A3.8060107-hi6Y0CQ0nG0@public.gmane.org>
2014-02-01 19:05 ` Clemens Eisserer
2014-01-30 3:27 ` [PATCH 0/1] " Andreas Rohner
2014-01-30 5:29 ` Ryusuke Konishi
[not found] ` <20140130.142941.55837481.konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2014-01-30 5:59 ` Andreas Rohner
2014-01-30 6:29 ` Andreas Rohner
[not found] ` <52E9F13A.5050805-hi6Y0CQ0nG0@public.gmane.org>
2014-01-30 8:46 ` Ryusuke Konishi
2014-01-30 8:35 ` [static superblock discussion] Does nilfs2 do any in-place writes? Vyacheslav Dubeyko
[not found] ` <71B2806D-7CF2-4992-A588-EB73EADFFF9F-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-01-30 10:09 ` Clemens Eisserer
[not found] ` <CAFvQSYQ84_BsqVC_ZM77P92jkP+1dh7NexvZWg4mFE7B3wSK0A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-30 12:42 ` Vyacheslav Dubeyko
[not found] ` <AE0F313D-5934-452B-80AB-5D691AF8A4BE-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-01-30 13:09 ` Clemens Eisserer
[not found] ` <CAFvQSYQGDXmUit1zFZ9_LAjdLjxM-i_yR2L6pwFDX_BEdjdXxQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-30 13:32 ` Vyacheslav Dubeyko
2014-01-30 14:03 ` Clemens Eisserer
[not found] ` <CAFvQSYQ-qkXz677-obgHVN5fLQiF10-A=T2yNNAHKRcOGm_Pqw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-30 15:27 ` Vyacheslav Dubeyko
[not found] ` <720AFF13-6203-4A28-9850-3C2CAFF3B7BF-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-02-05 20:47 ` Clemens Eisserer
[not found] ` <CAFvQSYStT4uwxqtxATLbPOvHYjww=sw=C=f3vBi_qdu6MXAn5A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-02-07 6:43 ` Vyacheslav Dubeyko
2014-01-16 10:03 ` Clemens Eisserer
[not found] ` <CAFvQSYSC7+dd93pRH-uok9N+A_s=1VKrfGEppu3qRTg3q=CuXQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-16 10:10 ` Vyacheslav Dubeyko
-- strict thread matches above, loose matches on Subject: below --
2014-01-16 17:48 Mark Trumpold
2014-01-16 18:41 ` Clemens Eisserer
2014-01-17 6:31 ` Vyacheslav Dubeyko
2014-01-18 1:47 ` Ryusuke Konishi
[not found] ` <20140118.104703.356941870.konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2014-01-18 9:44 ` Clemens Eisserer
[not found] ` <CAFvQSYQZtf0fsfX_7zNHdw4hVo9VHggN9F0TYEi1Fwo2ZvS4Ng-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-01-18 16:25 ` Mark Trumpold
[not found] ` <CEFFE8EC.9A4A%markt-qk0wvQ0ghJwAvxtiuMwx3w@public.gmane.org>
2014-01-18 18:11 ` Vyacheslav Dubeyko
2014-01-18 11:45 ` Andreas Rohner
[not found] ` <52DA696D.6010206-hi6Y0CQ0nG0@public.gmane.org>
2014-01-18 23:08 ` Vyacheslav Dubeyko
[not found] ` <04877EE1-F5BF-41CE-AC92-CD9C3ED0B8A4-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>
2014-01-18 23:08 ` Andreas Rohner
[not found] ` <52DB098A.4010300-hi6Y0CQ0nG0@public.gmane.org>
2014-01-19 5:43 ` Ryusuke Konishi
[not found] ` <20140119.144345.373615211.konishi.ryusuke-Zyj7fXuS5i5L9jVzuh4AOg@public.gmane.org>
2014-01-19 14:11 ` Andreas Rohner
2014-01-16 19:40 Mark Trumpold
2014-01-17 19:19 Mark Trumpold
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