linux-raid.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* RAID0 size bug (?)
@ 2010-10-08 22:56 Janos Haar
  2010-10-08 23:45 ` Neil Brown
  0 siblings, 1 reply; 4+ messages in thread
From: Janos Haar @ 2010-10-08 22:56 UTC (permalink / raw)
  To: linux-raid

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 


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: RAID0 size bug (?)
  2010-10-08 22:56 RAID0 size bug (?) Janos Haar
@ 2010-10-08 23:45 ` Neil Brown
  2010-10-09 19:09   ` Janos Haar
  0 siblings, 1 reply; 4+ messages in thread
From: Neil Brown @ 2010-10-08 23:45 UTC (permalink / raw)
  To: Janos Haar; +Cc: linux-raid

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?

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


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: RAID0 size bug (?)
  2010-10-08 23:45 ` Neil Brown
@ 2010-10-09 19:09   ` Janos Haar
  2010-10-09 20:01     ` Neil Brown
  0 siblings, 1 reply; 4+ messages in thread
From: Janos Haar @ 2010-10-09 19:09 UTC (permalink / raw)
  To: Neil Brown; +Cc: linux-raid


----- 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 


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: RAID0 size bug (?)
  2010-10-09 19:09   ` Janos Haar
@ 2010-10-09 20:01     ` Neil Brown
  0 siblings, 0 replies; 4+ messages in thread
From: Neil Brown @ 2010-10-09 20:01 UTC (permalink / raw)
  To: Janos Haar; +Cc: linux-raid

On Sat, 9 Oct 2010 21:09:16 +0200
"Janos Haar" <janos.haar@netcenter.hu> wrote:

> 
> ----- 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?

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 


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2010-10-09 20:01 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-10-08 22:56 RAID0 size bug (?) Janos Haar
2010-10-08 23:45 ` Neil Brown
2010-10-09 19:09   ` Janos Haar
2010-10-09 20:01     ` Neil Brown

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).