Plus if i raid1 it then i only have two bootable disks..at least
this way i have 4 bootable disks..:)
No, you don't have 4. Please study the way a RAID10 array works.
On 03/07/2012 07:43 PM, Miguel Medalha wrote:
Plus if i raid1 it then i only have two bootable disks..at least
this way i have 4 bootable disks..:)
No, you don't have 4. Please study the way a RAID10 array works.
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We are talking about *software* /boot partition on RAID1! that can have any number of member partitions. And the rest of the disk here discussed is *software* "mdraid RAID10" with 1,2,3,4,... member partitions, not regular hardware RAID1+0!!
Please first read up on it, then comment.
On Mar 7, 2012, at 7:48 PM, Ljubomir Ljubojevic office@plnet.rs wrote:
We are talking about *software* /boot partition on RAID1! that can have any number of member partitions. And the rest of the disk here discussed is *software* "mdraid RAID10" with 1,2,3,4,... member partitions, not regular hardware RAID1+0!!
I think that line of discussion started when someone mentioned their Ubuntu with grub2 can do mdraid10 whole disk, /boot whatever.
Of course with whole disk or /boot mdraid10, you don't know which of the 4 drives (besides the first) is bootable (mdraid10 distributes copies), so you'll need to add MBR and grub to all 4 and swap them around until it booted.
In a 4 disk mdraid10 setup, even with grub2, the best method is still /boot as a 4 disk mdraid1 so any of the 4 can boot. Though you only need grub on the first two, cause if they are both out so is the mdraid10.
-Ross
On 03/08/2012 02:03 PM, Ross Walker wrote:
On Mar 7, 2012, at 7:48 PM, Ljubomir Ljubojevicoffice@plnet.rs wrote:
We are talking about *software* /boot partition on RAID1! that can have any number of member partitions. And the rest of the disk here discussed is *software* "mdraid RAID10" with 1,2,3,4,... member partitions, not regular hardware RAID1+0!!
I think that line of discussion started when someone mentioned their Ubuntu with grub2 can do mdraid10 whole disk, /boot whatever.
I am referring to OP question.
Of course with whole disk or /boot mdraid10, you don't know which of the 4 drives (besides the first) is bootable (mdraid10 distributes copies), so you'll need to add MBR and grub to all 4 and swap them around until it booted.
In a 4 disk mdraid10 setup, even with grub2, the best method is still /boot as a 4 disk mdraid1 so any of the 4 can boot. Though you only need grub on the first two, cause if they are both out so is the mdraid10.
Setting boot on other two should be done, so if someone mixes up cables system still boots. It's only 2-3 minutes more to do it right. I do not belive in half-done jobs, always bite me if I do that.
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Ljubomir Ljubojevic -
Miguel Medalha -
Ross Walker