Solved: Re: [lug] Kernel reorders SCSI drives.
David L. Anselmi
anselmi at anselmi.us
Tue Oct 31 22:41:38 MST 2006
David L. Anselmi wrote:
> I updated my rules to make my drives sataa, satab, and usba. Well, the
> USB drive gets renamed just fine (it matches on product since I have
> more than one but they get named the same). The SATA drives show up as
> sda and sdb--matching on serial isn't working for them.
Happily, I'm an idiot. Well, at least udev is smarter than I am.
So a little digging and I find that the SATA drives don't have a serial
attribute in sysfs like the USB drive does so my rules weren't matching.
Turns out a scsi_id program puts that info into the environment.
Moving my renaming rules after the scsi_id program and using its
environment solves the problem--I can have the sd? names I want even
though the kernel reorders randomly.
udevtest told me what I needed, if I'd been smart enough to understand
its output. Also udevinfo -a shows what isn't available to match. And
--query=all shows the kernel name (regardless of changes, which match
the block minor numbers).
I think it would be nice if the kernel cared more about hardware
arrangement than timing on boot. But since udev can actually get around
it I won't complain.
Thanks for listening.
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