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....
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.
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. .
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