From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Liu Hui" <onlyflyer@gmail.com>
Subject: Re: A bug with multiple devices?
Date: Wed, 31 Dec 2008 09:17:01 +0800
Message-ID: <2c3b11250812301717q7d54a8cdt6417d32468ea2eee@mail.gmail.com>
References: <49597D06.1050806@cn.fujitsu.com> <495AC6AC.4000302@cn.fujitsu.com>
Mime-Version: 1.0
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Cc: linux-btrfs@vger.kernel.org
To: "Shen Feng" <shen@cn.fujitsu.com>
Return-path: <linux-btrfs-owner@vger.kernel.org>
In-Reply-To: <495AC6AC.4000302@cn.fujitsu.com>
List-ID: <linux-btrfs.vger.kernel.org>

mkfs.btrfs -m raid1 just means 'meta data' works as raid1

You should try mkfs.btrfs -d raid1

This maybe help:
mkfs.btrfs [-A <offset>] [-b <size>] [-l <size>] [-n <size>] [-l
<label>] [-s <size>] [-m raid0|raid1|raid10|single] [-d
raid0|raid1|raid10|single] <device>

2008/12/31 Shen Feng <shen@cn.fujitsu.com>:
>
>
> on 12/30/2008 09:44 AM, Shen Feng wrote:
>> Hi,
>>
>> I create a raid-1 btrfs with the following command.
>>
>> [root@localhost ~]# fdisk -l /dev/sdb
>>
>> Disk /dev/sdb: 320.0 GB, 320072933376 bytes
>> 255 heads, 63 sectors/track, 38913 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>> Disk identifier: 0xb44829ea
>>
>>    Device Boot      Start         End      Blocks   Id  System
>> /dev/sdb1               1        4863    39062016   83  Linux
>> /dev/sdb2            4864        9726    39062047+  83  Linux
>> /dev/sdb3            9727       38905   234375905+   f  W95 Ext'd (LBA)
>> /dev/sdb5            9727       14590    39063374   83  Linux
>> /dev/sdb6           14590       19453    39068690+   7  HPFS/NTFS
>> /dev/sdb7           19454       29178    78116031   83  Linux
>> /dev/sdb8           29179       31610    19535008+  83  Linux
>> /dev/sdb9           31611       34041    19526976   83  Linux
>> /dev/sdb10          34042       36473    19535008+  83  Linux
>> /dev/sdb11          36474       38904    19526976   83  Linux
>>
>> [root@localhost ~]# mkfs.btrfs -m raid1 /dev/sdb8 /dev/sdb9 /dev/sdb10 /dev/sdb11
>> adding device /dev/sdb9 id 2
>> adding device /dev/sdb10 id 3
>> adding device /dev/sdb11 id 4
>> fs created label (null) on /dev/sdb8
>>       nodesize 4096 leafsize 4096 sectorsize 4096 size 74.50GB
>> Btrfs v0.16-29-g0d53b21
>>
>> [root@localhost ~]# mount -t btrfs /dev/sdb8 /mnt/btrfs[root@localhost ~]# df
>> Filesystem           1K-blocks      Used Available Use% Mounted on
>> ...
>> /dev/sdb8             78123968        28  78123940   1% /mnt/btrfs
>>
>
> More test:
>
> [root@localhost btrfs]# df -h /dev/sdb8
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sdb8              75G   28K   75G   1% /mnt/btrfs
> [root@localhost btrfs]# dd if=/dev/zero of=/mnt/btrfs/file bs=1024 count=1024
> 1024+0 records in
> 1024+0 records out
> 1048576 bytes (1.0 MB) copied, 0.0481317 s, 21.8 MB/s
> [root@localhost btrfs]# sync
> [root@localhost btrfs]# df -h /dev/sdb8
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sdb8              75G  1.1M   75G   1% /mnt/btrfs
>
> With raid-1, the used space may be double (about 2.2M), I think.
>
>
>
>> I think the partition size is no correct since this is a raid-1 partition.
>> The size should be half.
>> Is this a bug?
>>
>> -Shen
>> --
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>>
>
> --
> Best Regards,
> --------------------------------------------------
> Shen Feng
> Development Dept.I
> Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
> 8/F., Civil Defense Building, No.189 Guangzhou Road,
> Nanjing, 210029, China
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-- 
Thanks & Best Regards
Liu Hui
--