[CentOS] Re: software raid

[Les Mikesell]

Jeff Lasman wrote:
> On Sunday 01 April 2007 11:37 am, Les Mikesell wrote:
> 
>> The question is whether the kernel will notice the new drive when you
>> add it.  It might be possible to swap in an exact match and get away
>> with the setup detected at boot time but that doesn't sound very
>> healthy.  Can you hotswap a new SATA drive that wasn't present at
>> boot time and have the kernel notice the new drive device and its
>> partitions.
> 
> Thinking more about this ...
> 
> I most likely wouldn't have a drive "ready" as all our servers don't 
> have the same configuration.
> 
>> If the partitions are recognized, mdadm will be able to 
>> add them.
> 
> Could I create partitions on a new drive (fdisk) and then do either a 
> mount or remount?  And then start rebuilding the RAID?

Yes, but there is still the issue of whether the drive will be 
recognized at all when hotplugged.  Once the drive is assigned a device 
name by the kernel you will be able to fdisk it.  You don't need to 
mount  it because the md device will be mounted, not the disk partitions.

-- 
   Les Mikesell
    lesmikesell at gmail.com