Re: 3ware raid question

[Jason Leach <jason.leach@gmail.com>]

Raz:
 
 The 3ware (at least my 9500S-8) keeps the info about the disk and how
it fits into the RAID array on the disk;  I think in the DCB is used
for this.  You can (and I have) unplug the disks, then connect them to
different ports and the array will still work fine.
 
 When you are adding a disk from a different array it probably has the
DCB from that array.  This is conflicting with your new array. I would
do as the Dan suggests, and clear the disk.
 
 Jason.

On 8/2/05, Dan Stromberg <strombrg@dcs.nac.uci.edu> wrote: On Tue,
2005-08-02 at 13:52 +0300, Raz Ben-Jehuda(caro) wrote:

> i have encountered a weired feature of 3ware raid.
> When i try to put inside an existing raid a disk which
> belonged to a different 3ware raid if fail. 
> Any idea anyone ?

Two thoughts:

1) Maybe test the disk in another machine and see if it's still good

2) Maybe wipe the disk clean in another machine with something like:

        dd if=/dev/zero of=/dev/sdb 

...but be very careful to get the right disk (IE, you may not
need /dev/sdb, you might need /dev/hdd or a number of other
possibilities).