Re: Resizing Raid 1 partitions
Aaron Toponce wrote:
> On 05/19/2010 12:47 PM, Erwan David wrote:
>> Hi,
>>
>> I have a setup with 2 disks and following raid setting:
>>
>> sda1+sdb1 -> md0, /
>> sda2+sdb2 -> md1 swap
>> sda3+sdb3 -> md2 /home
>>
>> I'd like to resize partitions to get more space on md2 and less on md0.
>>
>> What would bea good way to achieve this ?
>
> The "best" way to acheive this would be to use LVM above your software
> RAID. At that point, it would be very painless, compared to what is
> ahead of you now. If you're curious, here would be the steps:
>
> mdadm -C /dev/md0 -n 2 -l 1 -a yes /dev/sd{a,b}
> pvcreate /dev/md0
> vgcreate home /dev/md0
> lvcreate -L 1G -n swap home
> lvcreate -L 10G -n root home
> lvcreate -l 100%FREE -n home home
>
> Then, for giving more space to home, and less to root, boot off a live
> CD, and (assuming you're using ext3/4):
>
> e2fsck /dev/home/root
> resize2fs /dev/home/root 6G
> lvreduce -L 6G /dev/home/root
> lvextend -L +4G /dev/home/home
> resize2fs /dev/home/home
>
> That's it! However, because you chose not to use LVM, you will need to
> boot of a live CD that supports Linux software RAID, rebuild the array,
> and perform the resizing there. I'm not sure if GParted supports this or
> not. Worth checking out, however.
>
> I would personally recommend backing up your data, and reinstalling,
> with LVM on top of your software RAID. You still have the redundancy,
> and you have the awesome flexibility of resizing volumes with great ease.
>
Thanks. But I would have preferred avoiding full reinstall...
I found this tutorial
http://www.howtoforge.com/how-to-resize-raid-partitions-shrink-and-grow-software-raid
I will try first.
--
Erwan
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