From: "Janos Haar" <janos.haar@netcenter.hu>
To: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: RAID0 size bug (?)
Date: Sat, 9 Oct 2010 21:09:16 +0200 [thread overview]
Message-ID: <0c3201cb67e5$7b064010$0400a8c0@dcccs> (raw)
In-Reply-To: 20101009104516.129c60e2@notabene
----- Original Message -----
From: "Neil Brown" <neilb@suse.de>
To: "Janos Haar" <janos.haar@netcenter.hu>
Cc: <linux-raid@vger.kernel.org>
Sent: Saturday, October 09, 2010 1:45 AM
Subject: Re: RAID0 size bug (?)
> On Sat, 9 Oct 2010 00:56:38 +0200
> "Janos Haar" <janos.haar@netcenter.hu> wrote:
>
>> Hello list,
>>
>> Maybe a known old bug, but i don't know.
>>
>> The size is wrong of the md8:
>>
>> [root@UNISTORE ~]# fdisk -l /dev/sdh
>>
>> Disk /dev/sdh: 750.1 GB, 750156374016 bytes
> ^^^^^^^^^
>> 255 heads, 63 sectors/track, 91201 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> So 750GB
>
>>
>> Disk /dev/sdh doesn't contain a valid partition table
>> [root@UNISTORE ~]# fdisk -l /dev/sdf
>>
>> Disk /dev/sdf: 500.1 GB, 500107862016 bytes
> ^^^^^^^^^
>> 255 heads, 63 sectors/track, 60801 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> This one is 500GB
>
>
>>
>> Disk /dev/sdf doesn't contain a valid partition table
>> [root@UNISTORE ~]# mdadm --detail /dev/md8
>> /dev/md8:
>> Version : 00.90.03
>> Creation Time : Sat Oct 9 06:36:36 2010
>> Raid Level : raid0
>> Array Size : 1220961088 (1164.40 GiB 1250.26 GB)
> ^^^^^^^^^^^
>
> 750GB + 500GB == 1250 GB
>
> So what is your problem?
Shouldn't be 2x500GB?
...because this is stripe, not linear array. :-)
I mean should be used the smallest drive's size, no?
>
> NeilBrown
>
>
>> Raid Devices : 2
>> Total Devices : 2
>> Preferred Minor : 8
>> Persistence : Superblock is not persistent
>>
>> Update Time : Sat Oct 9 06:36:36 2010
>> State : clean
>> Active Devices : 2
>> Working Devices : 2
>> Failed Devices : 0
>> Spare Devices : 0
>>
>> Chunk Size : 64K
>>
>> Number Major Minor RaidDevice State
>> 0 8 112 0 active sync /dev/sdh
>> 1 8 80 1 active sync /dev/sdf
>> [root@UNISTORE ~]#
>> [root@UNISTORE ~]# uname -a
>> Linux UNISTORE 2.6.28.10 #5 SMP Fri Jan 29 07:40:35 CET 2010 x86_64
>> x86_64
>> x86_64 GNU/Linux
>> [root@UNISTORE ~]# mdadm -V
>> mdadm - v2.5.4 - 13 October 2006
>> [root@UNISTORE ~]#
>>
>>
>> Cheers,
>> Janos
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2010-10-09 19:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-08 22:56 RAID0 size bug (?) Janos Haar
2010-10-08 23:45 ` Neil Brown
2010-10-09 19:09 ` Janos Haar [this message]
2010-10-09 20:01 ` Neil Brown
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