[CentOS] Software Raids Questions (I have only ever used hardware?)

[aurfalien at gmail.com]

craig, u can grow via md which is what u do first, then grow the fs.

ex;

mdadm --grow ... to add a drive

then,

mdadm --add ... to gorw the raid onto it

then,

pvresize ... to grow your filesystem onto it.

atleast this is how i've dun it.


On Sep 27, 2009, at 2:07 PM, Craig White wrote:

> On Sun, 2009-09-27 at 21:49 +0100, James Bensley wrote:
>> 2009/9/27  <aurfalien at gmail.com>:
>>> you must format those drive to the desired fs after raiding them
>>
>> Those where my initial thoughts, damn it!  Hmm, going to have to  
>> bring
>> a sand box server home from work, oh the hassle.
>> Thanks for the confirmation though.
>> ...
>>> md (software raid mechanism or watever u wanna call it) allows u to
>>> grow so if your raid is formatted with an fs that allows u to grow,
>>> then u r good to go (lvm will allow u to grow).
>>
>> This was also my current belief, again thanks for confirming that.
> ----
> you will not be able to add more physical drives to an existing RAID-5
> array. You can however, add new available storage space (RAID or  
> drives)
> to an existing LVM partition with some of the LVM commands.
>
> Just so we are clear...
>
> RAID is physical drives.
> LVM is a partitioning scheme.
>
> Craig
>
>
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