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Old 12-10-2009, 11:28 PM
Christopher Chan
 
Default raid10, centos 4.x

John R Pierce wrote:
> I just created a 4 drive mdadm --level=raid10 on a centos 4.8-ish system
> here, and shortly thereafter remembreed I hadn't updated it in a while,
> so i ran yum update...
>
> while installing/updating stuff, got these errors:
>
> Installing: kernel #######################
> [14/69]
> raid level raid10 (in /proc/mdstat) not recognized
> ...
> Installing: kernel-smp #######################
> [19/69]
> raid level raid10 (in /proc/mdstat) not recognized
>
>
> is this a problem? the raid10 'seems' to work....
>

If anaconda is doing the update here, I guess it is because anaconda in
4.x does not have raid10 personality support. The raid10 personality is
NOT the same as nested raid1+0. It is an entirely new module from Neil
Brown that has a poor choice of a name imho. It does things very
differently from what you expect from a nested raid1+0 array.
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Old 12-10-2009, 11:51 PM
John R Pierce
 
Default raid10, centos 4.x

Christopher Chan wrote:
> If anaconda is doing the update here, I guess it is because anaconda in
> 4.x does not have raid10 personality support. The raid10 personality is
> NOT the same as nested raid1+0. It is an entirely new module from Neil
> Brown that has a poor choice of a name imho. It does things very
> differently from what you expect from a nested raid1+0 array.
>

the update was a simple `yum update`

differently how? I expect to be striping two mirrors, all munged into
one unit, without generating intermediate MD devices which has always
seemed messy to me.

.
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Old 12-11-2009, 12:06 AM
Christopher Chan
 
Default raid10, centos 4.x

John R Pierce wrote:
> Christopher Chan wrote:
>> If anaconda is doing the update here, I guess it is because anaconda in
>> 4.x does not have raid10 personality support. The raid10 personality is
>> NOT the same as nested raid1+0. It is an entirely new module from Neil
>> Brown that has a poor choice of a name imho. It does things very
>> differently from what you expect from a nested raid1+0 array.
>>
>
> the update was a simple `yum update`
>
> differently how? I expect to be striping two mirrors, all munged into
> one unit, without generating intermediate MD devices which has always
> seemed messy to me.

http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10
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