[Ocfs2-users] About DISK space of OCFS2.
ohue.hidetoshi at jp.fujitsu.com
ohue.hidetoshi at jp.fujitsu.com
Sun Oct 18 21:00:14 PDT 2009
Hi Tao
Thank you for your quick reply.
I learnt to do pre allocation.
So,I copied file(1byte) each 1file until the change occurs to the result of "df".
I learnt to change of each 8192K byte in the "df" command.
Thank you.
Hide
>Date: Mon, 19 Oct 2009 09:46:50 +0800
>From: Tao Ma <tao.ma at oracle.com>
>Subject: Re: [Ocfs2-users] About DISK space of OCFS2.
>Hi ohue,
> ocfs2 is a cluster file system, so in order to speed up the process and
>avoid cluster lock, we do some preallocation in some system
>files(local_alloc files and inode_alloc files). And df is used to
>indicate the fs statistics for the whole volume.
>
>In your case, the ocfs2 volume have already allocated enough inodes and
>disk spaces to this mounted node, so when you create a new file this
>node will try to allocate inodes and disk spaces from its own
>inode_alloc and local_alloc. And if it succeeds, you won't see any disk
>change for the whole volume.
>
>Hope I explain it clearly.
>
>Regards,
>Tao
>
>ohue.hidetoshi at jp.fujitsu.com wrote:
>> Hi ALL
>>
>> I have a question about DISK space of OCFS2.
>> I copy a file by a "cp" command after check the DISK space by "df -k" command.
>> There is no change when I cheked the DISK space by "df -k"command again.
>>
>> I show below an procedure.
>> -------------------------------------------------------------------------------
>> root at CPU_N:/fm/bbb> ls -l
>> total 3
>> -rwxr-xr-x 1 root root 89 Jan 3 16:01 qmount.sh
>> -rwxr-xr-x 1 root root 137 Jan 3 16:01 qumount.sh
>> -rwxr-xr-x 1 root root 435 Jan 3 16:01 set_if.sh
>> -rwxr-xr-x 1 root root 97 Jan 3 16:01 shtest.sh
>> -rwxr-xr-x 1 root root 468 Jan 3 16:01 syslog_chg.sh
>> -rwxr-xr-x 1 root root 46 Jan 3 16:01 testtest.sh
>>
>> root at CPU_N:/fm/bbb> df -k
>> Filesystem 1K-blocks Used Available Use% Mounted on
>> /dev/sda4 6594680 150216 6444464 3% /fm
>>
>> root at CPU_N:/fm/bbb> cp set_if.sh set_if.cpy
>>
>> root at CPU_N:/fm/bbb> sync
>>
>> root at CPU_N:/fm/bbb> df -k
>> Filesystem 1K-blocks Used Available Use% Mounted on
>> /dev/sda4 6594680 150216 6444464 3% /fm
>>
>> root at CPU_N:/fm/bbb> ls -l
>> total 4
>> -rwxr-xr-x 1 root root 89 Jan 3 16:01 qmount.sh
>> -rwxr-xr-x 1 root root 137 Jan 3 16:01 qumount.sh
>> -rwxr-xr-x 1 root root 435 Jan 3 16:04 set_if.cpy
>> -rwxr-xr-x 1 root root 435 Jan 3 16:01 set_if.sh
>> -rwxr-xr-x 1 root root 97 Jan 3 16:01 shtest.sh
>> -rwxr-xr-x 1 root root 468 Jan 3 16:01 syslog_chg.sh
>> -rwxr-xr-x 1 root root 46 Jan 3 16:01 testtest.sh
>> -------------------------------------------------------------------------------
>>
>> *The version is the following.
>> Linux-2.6.21.7
>> ocfs2-tools-1.2.3
>>
>>
>> Do you know a reason and a solution?
>> Please give it for me.
>>
>> Hide
>>
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