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Re: Sata controller order

In article <9R3QW-3ap-69@gated-at.bofh.it>,
 Ron Johnson <ron.l.johnson@cox.net> wrote:

> Hash: SHA1
> On 01/29/08 12:09, Stuart Gall wrote:
> > Hello,
> > I have a problem with 4.0r2 (although it is probably not exclusive to 
> > that release)
> > 
> > On a number of systems with multiple sata controllers the controllers 
> > come up in different orders (randomly on boot) the order is always the 
> > same in lilo but gets changed sometimes by the time the kernel loads.
> > This has the effect of juggling the drives so mount does not work.
> > 
> > I have seen this problem in a number of places on the net, the usual 
> > solution posted is to mount by label rather than by drive.
> > 
> > This is possible for EXT2/EXT3 but it is not possile AFAIKS for swap. 
> Swap partitions *can* have labels.  You can also mount by UUID.

Yes swap partitions can have labels, yes you can mount ext2/ext3 
filesystems bu UUID. But it does not work for swap.

At least that is my interpretation of man fstab. And no matter what I 
try in fstab I cant mount swap by label or UUID.

Can you give me an example of what my fstab entry should look like

LABEL=swap  swap swap defaults 0 0
Does not work.

> > Also the reason these systems have multiple sata controllers is that 
> > they have a raid partition. So also I am not sure how the md device 
> > would handle having its disks moved around.
> > 
> > Is there some way to force a particular controller, and hence disk, 
> > ordering on the kernel ?
> > 
> > For the moment, if these systems have to be shutdown. On reboot if the 
> > order is wrong we get dumped to ramfs then we just ctrl-alt-delete 
> > repeatedly until the order comes right and the system boots.
> > 
> > I can not understand why the order would be random.
> > 
> > I am using irqpoll kernel flag to boot these systems, otherwise we get 
> > sda lost interrupt, not sure if that is relevant.
> > 
> - --
> Ron Johnson, Jr.
> Jefferson LA  USA
> "I'm not a vegetarian because I love animals, I'm a vegetarian
> because I hate vegetables!"
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