Re: mdadm create size problem

[Herta Van den Eynde <herta.vandeneynde@cc.kuleuven.be>]

I was trying mdadm-1.11.0 which I picked up from
http://www.be.kernel.org/pub/linux/utils/raid/mdadm/mdadm-1.11.0.tar.gz
on Red Hat Advanced Server 2.1 most recent kernel update:
# cat /proc/version
Linux version 2.4.9-e.62enterprise (bhcompile@tweety.build.redhat.com) 
(gcc version 2.96 20000731 (Red Hat Linux 7.2 2.96-129.7.2)) #1 SMP Fri 
Apr 8 18:46:17 EDT 2005

Kind regards,

Herta

Tyler wrote:
> What version were you trying?  1.9.0 and 1.11.0 are considered the 
> latest stable versions i believe.
> 
> Regards,
> Tyler.
> 
> Herta Van den Eynde wrote:
> 
>> FWIIW, I reverted to mdadm-1.4.0-1, and that version creates the 
>> RAID1+0 just fine.
>>
>> Herta
>>
>> Herta Van den Eynde wrote:
>>
>>> OK, there's definitely something wrong here.  I ran a
>>> # mdadm --zero-superblock --force /dev/sdX
>>> followed by
>>> # dd if=/dev/zero of=/dev/sdX bs=64k
>>> where X=[g-in-p], and when I try to create a RAID 1 using two of these
>>> devices, it still sets the size to 139904K.  When I create a RAID 0
>>> using the same devices, mdadm does set the size correctly.
>>>
>>> # mdadm --create --verbose /dev/md6 --level=1 --raid-devices=2 /dev/sdh
>>> /dev/sdo
>>> mdadm: size set to 139904K
>>> mdadm: array /dev/md6 started.
>>>
>>> # mdadm --create --verbose /dev/md6 --level=0 --raid-devices=2 /dev/sdh
>>> /dev/sdo
>>> mdadm: chunk size defaults to 64K
>>> mdadm: array /dev/md6 started.
>>> # mke2fs -j -v  /dev/md6
>>> (...)
>>> # mount /dev/md6 /mnt; df /mnt
>>> Filesystem           1k-blocks      Used Available Use% Mounted on
>>> /dev/md6             141124600     32828 133923052   1% /mnt
>>>
>>> Is this a bug, or am I overlooking something?
>>>
>>> Herta
>>>
>>>
>>> Herta Van den Eynde wrote:
>>>
>>>> Red Hat AS 2.1 mdadm 1.11
>>>> I have two devices that used to be part of a now corrupt RAID10 
>>>> configuration.  When I try to reuse them to create a RAID1, it only 
>>>> uses about 1 third of the diskspace available.
>>>> # fdisk -l /dev/sdg
>>>>
>>>> Disk /dev/sdg: 255 heads, 63 sectors, 8924 cylinders
>>>> Units = cylinders of 16065 * 512 bytes
>>>>
>>>>    Device Boot    Start       End    Blocks   Id  System
>>>> /dev/sdg1             1      8924  71681998+  fd  Linux raid autodetect
>>>>
>>>> # fdisk -l /dev/sdn
>>>>
>>>> Disk /dev/sdn: 255 heads, 63 sectors, 8924 cylinders
>>>> Units = cylinders of 16065 * 512 bytes
>>>>
>>>>    Device Boot    Start       End    Blocks   Id  System
>>>> /dev/sdn1             1      8924  71681998+  fd  Linux raid autodetect
>>>>
>>>> # mdadm --create --verbose /dev/md5 --level=1 --raid-devices=2 
>>>> /dev/sdg /dev/sdn
>>>> mdadm: /dev/sdg appears to contain an ext2fs file system
>>>>     size=419520K  mtime=Mon May  2 17:04:04 2005
>>>> mdadm: /dev/sdn appears to contain an ext2fs file system
>>>>     size=419520K  mtime=Mon May  2 17:04:04 2005
>>>> mdadm: size set to 139904K
>>>> Continue creating array? n
>>>>
>>>> If I try to add the --size option, even a size that is 139904K or 
>>>> less, it tells me the size is invalid:
>>>>
>>>> # mdadm --create --verbose /dev/md5 --level=1 --raid-devices=2 
>>>> /dev/sdg /dev/sdn --size=139904K
>>>> mdadm: invalid size: 139904K
>>>>
>>>> I did reboot the system after fdisk'ing the devices.
>>>>
>>>> Do I need to low-level format these devices to be able to reuse them?
>>>>
>>>> Kind regards,
>>>>
>>>> Herta
>>>
>>>
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-- 
Herta Van den Eynde              -=- Toledo system management
K.U. Leuven - Ludit              -=- phone: +32 (0)16 322 166
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"I wish I were two little cats.  Then I could play together."
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