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From: Austin S Hemmelgarn <ahferroin7@gmail.com>
To: Timothy Normand Miller <theosib@gmail.com>
Cc: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: So, wipe it out and start over or keep debugging?
Date: Tue, 18 Aug 2015 11:56:42 -0400	[thread overview]
Message-ID: <55D355BA.40500@gmail.com> (raw)
In-Reply-To: <CAK7bmU8uXvAcqWZbJs_Hv5LxG0R9_+pG-ecj1k8Np2q_+yNK_w@mail.gmail.com>

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On 2015-08-18 11:10, Timothy Normand Miller wrote:
> I ran the following command.  It spent a lot of time creating a
> 1672450048 byte file.  Then it stopped writing to the file and started
> using 100% CPU.  It's currently doing no I/O, and it's been doing that
> for a while now.  Is that supposed to happen?
>
Not normally, I've seen this happen sometimes before for a short period 
when it hits a group of blocks that don't compress well, but that 
usually goes away after a few seconds.  I think this is probably a bug. 
  However, it isn't unusual for a big filesystem to have a really small 
image produced if it contains mostly big files (btrfs-image just copies 
the metadata, not the actual file data, so even without compression, it 
usually will take up less space than the filesystem being imaged).



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  reply	other threads:[~2015-08-18 15:57 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-15 21:46 So, wipe it out and start over or keep debugging? Timothy Normand Miller
2015-08-17 11:43 ` Austin S Hemmelgarn
2015-08-17 18:52   ` Timothy Normand Miller
2015-08-18 11:21     ` Austin S Hemmelgarn
2015-08-18 13:30       ` Timothy Normand Miller
2015-08-18 15:10         ` Timothy Normand Miller
2015-08-18 15:56           ` Austin S Hemmelgarn [this message]
2015-08-18 21:09       ` Chris Murphy
2015-08-18 21:10         ` Timothy Normand Miller
2015-08-20 11:35         ` Austin S Hemmelgarn

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