Götz Reinicke wrote:
This is because of the sequence in which the cards are seen/configured on the PCI bus, as well as the scsi bus ID sequence. The scsi ID is not the only thing it looks at to decide what name it gives the drive.
Alexander Dalloz schrieb:
Am Do, den 29.04.2004 schrieb Götz Reinicke um 12:07:
Hi,
I have an Dell PE 1650 Server with an internal perc 3/di SCSI RAID Controller hosting a RAID 1 and an Adaptec 29160 Controller hosting an external Hardware RAID-Box.
If I boot, and try to install Fedora, the external RAID is seen as sda, the internal RAID as sdb.
How can I change this order, so that the internal RAID is sda and the external RAID is sdb? Any ideas?
Regards
Götz Reinicke
Just change the SCSI ID of the RAID arrays/drives. The lowest is sda, the second... Remembering your previous post about difficulties with an external SCSI driver array of SATA drives I guess you can specify the SCSI ID for the whole external box.
I do have different IDs, 0 for the internal RAID, 1 for the external RAID-Box. The later is attached to a different SCSI Controller.
But the external Box is seen as sda :-(
The general rule to decide what device gets what name is first configured controller, scsi id sequence on that bus, then next configured controller, scsi id sequence on that bus, etc.
Thus, you can have a controller in pci slot 1 and another in slot 3. If the controller in slot 3 is configured first its drives take precedence over those on the controller in slot 1.
If you have devices on a single controller, AFAIK they will always get configured in id sequence.
This can become a problem if you leave gaps in the scsi IDs then later add another device that fills that ID slot. the drives at the later IDs will get the name changed.
For example, you have a single scsi drive at ID 4. this will by default be named sda. Then you add another drive at ID 0. Now that new drive will be sda and the original becomes sdb. This effect can be a bit disconcerting at times if not expected.
so long... ...Götz
