How SW-RAID detects new disks

How SW-RAID detects new disks

[Rabeeh Khoury]

Hi list,

I have a question if Linux SW RAID stack can detect the presence of a 
new disk (say new SCSI disk attached to the system in runtime) 
automatically ?

If it can detect, how it does so ? Does a RAID daemon always scans SCSI 
subsystem and for new disks attached ? (seems fantasy ?)

Regards,
Rabeeh

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Re: How SW-RAID detects new disks

[Neil Brown]

On Sunday May 19, rabeeh@galileo.co.il wrote:
> Hi list,
> 
> I have a question if Linux SW RAID stack can detect the presence of a 
> new disk (say new SCSI disk attached to the system in runtime) 
> automatically ?

No, it cannot.  You would need some user-space tool to detect new
disks and decide what to do with them.  Adding them to a raid might be
one option.

NeilBrown