Re: [cobalt-developers] Hardware Raq4r mirroring Disk!

["Adam Thompson" <adamt@xxxxxxxxxx>]

> From: "Carlos F. Moreno" <cmoreno@xxxxxxxxxxxxx>
> Subject: [cobalt-developers] Hardware Raq4r mirroring Disk!
>

> We have a Cobalt RaQ4r, and we need to know the specifications to
other
> disk for mirror.
>
> My Cobalt RaQ4 have:
>
> Segate U10
> Model ST320423A
> 16,383 Cyl - 16 HDS - 63 Sect - LBA 40,011,300      20.4 GB
>
> And I buy: (because the Cobalt Raq4 segate model was discontinue)
>
> Segate U Series 5
> Model ST320413A
> 16,383 Cyl - 16 HDS - 63 Sect - LBA 39,102,336      20 GB
>
> On Cobalt Raq4 manual (page 170.), specify the features
>
> The only deference between the cobalt specification and my disk was
the
> Ultra ATA/33 (it was discontinued, and my RaQ4 have Ultra ATA/66) and
I
> have Ultra ATA/100.

You will need to use a disk with at least the same number of LBA sectors
as the disk you are replacing.  You can use a larger disk without ill
effect, the extra capacity will be unused.  I would get the next largest
disk available in the same product family, which I think is a 30Gb disk.

The linux md driver will refuse to mirror a partition of a given size to
a partition of smaller size - it is physically impossible to do so.

-Adam Thompson
 Qunara
 adamt@xxxxxxxxxx
 (204) 925-3256 - office
 (204) 932-0069 - fax