From: ching <lsching17@gmail.com>
To: Liu Bo <bo.li.liu@oracle.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: enquiry about defrag
Date: Tue, 11 Sep 2012 07:21:05 +0800 [thread overview]
Message-ID: <504E75E1.5060304@gmail.com> (raw)
In-Reply-To: <504DE6B3.2010900@oracle.com>
On 09/10/2012 09:10 PM, Liu Bo wrote:
> On 09/10/2012 08:19 PM, ching wrote:
>> On 09/09/2012 08:05 PM, ching wrote:
>>> On 09/09/2012 05:11 PM, Fajar A. Nugraha wrote:
>>>> On Sun, Sep 9, 2012 at 2:49 PM, ching <lsching17@gmail.com> wrote:
>>>>> On 09/09/2012 08:30 AM, Jan Steffens wrote:
>>>>>> On Sun, Sep 9, 2012 at 2:03 AM, ching <lsching17@gmail.com> wrote:
>>>>>>> 2. Is there any command for the fragmentation status of a file/dir ? e.g. fragment size, number of fragments.
>>>>>> Use the "filefrag" command, part of e2fsprogs.
>>>>>>
>>>>> my image is a 16G sparse file, after defragment, it still has 101387 extents, is it normal?
>>>> Is compression enabled? If so, yes, it's normal.
>>>>
>>> compression with lzo.
>>>
>>> thanks. i will retry with compression disabled when 3.6 is stable.
>> i just realize that it is possible to control compression per file by file attribute
>>
>> http://radudi.com/index.php/2011/08/31/using-btrfs-per-file-and-per-directory-compression/
>>
>> when i try to follow example above, no file attribute is shown (my mount option is rw,noatime,compress-force=lzo,space_cache,inode_cache)
>>
>> $lsattr -V Linux.raw_image
>> lsattr 1.42.5 (29-Jul-2012)
>> ---------------- Linux.raw_image
>>
>> is there any official resource/web page for control compression per file by file attribute?
>>
> FYI, git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
>
>> --
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>>
>
may i ask a stupid question, if i remove my "compress-force=lzo" option, will compression disabled for new written data?
next prev parent reply other threads:[~2012-09-10 23:21 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-09 0:03 enquiry about defrag ching
2012-09-09 0:30 ` Jan Steffens
2012-09-09 7:49 ` ching
2012-09-09 9:11 ` Fajar A. Nugraha
2012-09-09 12:05 ` ching
2012-09-10 12:19 ` ching
2012-09-10 13:10 ` Liu Bo
2012-09-10 23:21 ` ching [this message]
2012-09-11 1:28 ` Li Zefan
2012-09-11 11:12 ` ching
2012-09-10 9:23 ` Alex Lyakas
2012-09-11 11:12 ` ching
2012-09-11 11:45 ` David Sterba
2012-09-11 23:33 ` ching
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