[plug] Good RAID Howto

[Shannon Carver]

Yea, Ben's right.  I'm not sure if you're familiar with IDE devices 
under linux but they're always hda/hdb (first channel, master/slave, two 
devices), hdc/hdd, etc etc).

So all devices listed as sda, are in fact the one drive, or logical 
drive (in your case, sda would be the initial RAID array.

Are there any sd* listed devices in dmesg?

Regards

Shannon

Ben Jensz wrote:

> Unless you're already running hardware RAID on the current drives in 
> the system, then sda will be a single physical drive, and sda1, sda2 
> etc are partitions within that physical drive.
>
> If you're running proper hardware RAID, then the drives in whatever 
> RAID level they are in will appear as one physical drive (i.e. sda 
> could be multiple drives, but one drive is presented to the OS as it's 
> been made into a single RAID drive).  But the additional drives you've 
> added in this case aren't sda5-7.
>
> They will be something like sdb, sdc, sdd etc.
>
>
> / Ben
>
>
> Kai Jones wrote:
>
>> Running "dmesg | grep sd" gives the following:
>>
>> Attached scsi disk sda at scsi0, channel 1, id 0, lun 0
>> SCSI device sda: 71127040 512-byte hdwr sectors (36417 MB)
>>  sda: sda1 sda2 < sda5 sda6 sda7 >
>>
>> I'm guessing this means sda, sda1 and sda2 are the active RAID1 and 
>> sda5, 6 and 7 are spares because it doesn't yet know the 3 x 73 gig 
>> disks are plugged in and waiting ?
>>
>> Cheers
>> Kai
>>
>
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