[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: SAS scsibus target numbering
On Fri, Jul 27, 2012 at 07:35:19AM +1000, matthew green wrote:
> > I have a (mpt) SAS with seven discs connected.
> > The discs attach as sd0..sd6, but the SCSI target numbers are 0..5 and 7.
> > It appears to me that someone is skippig ID 6 for the controller.
> > It doesn't hurt too much, but it took me a while to find out why detaching
> > targets 2, 3, 4 and 5 worked and 6 didn't (of course, 7 worked).
> > Is there a reason for this behaviour?
> it's usual for the SCSI HBA to assign a targetID for itself.
> besides having to use a different number, is there any real reason
> you want to change them? perhaps a better solution would be to
> patch scsictl such that we can detach via autoconf name as well
> as scsi addresses. maybe we should do this anyway..
Depending on LSI firmware (I think), the LSI may re-number disks
depending on how they present themselves, uuid, etc. Some people like
this persistence (mainly Winders users, I imagine), it causes problems
To get around this, at work I used lsiutil to clear the NVRAM
settings. Otherwise, switching out all the LSI-attached disks in one
of the Open Connect Appliances made the drives present themselves as
da33 to da64, rather than da1 to da32 - under FreeBSD, obviously.
Main Index |
Thread Index |