RAID0 size bug (?)
am 09.10.2010 00:56:38 von Janos Haar
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
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
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)
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
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Re: RAID0 size bug (?)
am 09.10.2010 01:45:16 von NeilBrown
On Sat, 9 Oct 2010 00:56:38 +0200
"Janos Haar" 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?
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
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Re: RAID0 size bug (?)
am 09.10.2010 21:09:16 von Janos Haar
----- Original Message -----
From: "Neil Brown"
To: "Janos Haar"
Cc:
Sent: Saturday, October 09, 2010 1:45 AM
Subject: Re: RAID0 size bug (?)
> On Sat, 9 Oct 2010 00:56:38 +0200
> "Janos Haar" 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
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Re: RAID0 size bug (?)
am 09.10.2010 22:01:27 von NeilBrown
On Sat, 9 Oct 2010 21:09:16 +0200
"Janos Haar" wrote:
>
> ----- Original Message -----
> From: "Neil Brown"
> To: "Janos Haar"
> Cc:
> Sent: Saturday, October 09, 2010 1:45 AM
> Subject: Re: RAID0 size bug (?)
>
>
> > On Sat, 9 Oct 2010 00:56:38 +0200
> > "Janos Haar" 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?
No.
Try
man 4 md
and read the section in 'RAID0'.
NeilBrown
>
> >
> > 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
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