From: cinap_lenrek@gmx.de
To: 9fans@9fans.net
Subject: Re: [9fans] Thinkpad T61 Installation Experience
Date: Thu, 17 May 2012 18:00:09 +0200 [thread overview]
Message-ID: <f350de69a2df1fb900b5f1f54cd12826@rei2.9hal> (raw)
In-Reply-To: <D2A5C7470D67A54FACE86B838946D49D14E466F852@NJ4MSGSCR02.markit.partners>
no. lets look at a cwfs config.
filsys main c(/dev/sdC0/fscache)(/dev/sdC0/fsworm)
filsys dump o
filsys other (/dev/sdC0/fsother)
main is composed from fscache and fsworm. the cache contains the current
working set of blocks.
when data is requested and its not in the cache, it is read from
the worm and copied to the cache.
when you write new files, they are allocated in the cache. every day,
the filesystem runs a dump process wich copies the blocks that are in
the cache but not written to worm (dirty blocks) to the worm. and then
flags them as dumped so they can be replaced for other data in the cache.
its like a write cache to accumulate changes before they get written
to stable storage (worm).
only blocks that are new or got modified are dumped. this is like a
incremental backup. just that its not just backup, its the main
storage.
just read the fs paper erik linked. it explains it mutch better and
in more detail.
--
cinap
next prev parent reply other threads:[~2012-05-17 16:00 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-16 12:24 Burton Samograd
2012-05-16 12:32 ` Bruce Ellis
2012-05-16 12:49 ` Burton Samograd
2012-05-16 13:00 ` Peter A. Cejchan
2012-05-16 14:43 ` Martin Harriss
2012-05-16 15:00 ` Skip Tavakkolian
[not found] ` <CAJSxfmLZE3aNGmMusb=ZJAwn1AZEHuDxCeXJrRLADn+WV0KUEw@mail.gmail.c>
2012-05-16 15:02 ` erik quanstrom
2012-05-16 16:06 ` Charles Forsyth
2012-05-16 13:14 ` David du Colombier
2012-05-16 13:23 ` sl
2012-05-16 16:19 ` Burton Samograd
2012-05-16 16:34 ` cinap_lenrek
2012-05-17 12:39 ` Burton Samograd
2012-05-17 13:12 ` Jack Norton
2012-05-17 13:29 ` Burton Samograd
2012-05-17 14:01 ` erik quanstrom
2012-05-17 15:37 ` cinap_lenrek
2012-05-17 15:45 ` Burton Samograd
2012-05-17 16:00 ` cinap_lenrek [this message]
2012-05-18 21:13 ` [9fans] The creepy WORM. (was: Re: Thinkpad T61 Installation Experience) Nemo
2012-05-18 22:22 ` Bakul Shah
2012-05-18 22:45 ` Francisco J Ballesteros
2012-05-20 3:13 ` Bakul Shah
2012-05-20 8:37 ` Charles Forsyth
2012-05-20 8:38 ` Charles Forsyth
2012-05-20 10:07 ` Francisco J Ballesteros
2012-05-17 15:48 ` [9fans] Thinkpad T61 Installation Experience erik quanstrom
[not found] ` <D2A5C7470D67A54FACE86B838946D49D14E466F852@NJ4MSGSCR02.markit.pa>
2012-05-17 15:57 ` erik quanstrom
2012-05-17 16:09 ` David Romano
2012-05-17 16:26 ` erik quanstrom
2012-05-17 19:43 ` [9fans] +t and bind (Was Re: Thinkpad T61 Installation Experience) David Romano
2012-05-18 14:48 ` Ethan Grammatikidis
[not found] ` <CAM8pOuM+TDRPjkiWPENr_5qA0Mi5R=-ytmQSA1_ruUmQ54YbGw@mail.gmail.c>
2012-05-17 13:11 ` [9fans] Thinkpad T61 Installation Experience erik quanstrom
2012-05-17 13:28 ` Burton Samograd
2012-05-17 14:08 ` erik quanstrom
2012-05-17 14:49 ` Burton Samograd
2012-05-16 13:51 ` Nicolas Bercher
2012-05-16 14:05 ` erik quanstrom
2012-05-16 14:25 ` Charles Forsyth
2012-05-16 14:31 ` David du Colombier
[not found] ` <CAOw7k5jBKN2bxUov=Dagn1aL6nA_OORN+G8iPnkOzvf8mbScyw@mail.gmail.c>
2012-05-16 14:34 ` erik quanstrom
2012-05-16 14:18 ` David du Colombier
2012-05-16 14:21 ` cinap_lenrek
2012-05-16 14:36 ` erik quanstrom
2012-05-16 13:44 ` Nicolas Bercher
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