Which kernel config option shows hda as sda?

durwin · 10-25-2007, 10:19 AM

I know the new kernel releases show ide devices as sd (versus hd). This is fine, but I am forced to customize our installation and am starting with defconfig. I found this initial configuration does not have the mapping of hd devices to sd.

My question is, in the kernel configuration, what must I enable to get this mapping back? I am using 2.6.23 source.

Regards,

Durwin

The_JinJ · 10-25-2007, 10:42 AM

Think this is right - was reading about this the other day - think it's persistent block device names

Quote:

Don't know the option name - all I know is that some kernel releases ago IDE drives moved to a new "architecture" called libata, common with SATA. If it's enabled, they're sdX, if they use a legacy option, it's hdX.

Also

http://wiki.archlinux.org/index.php/..._device_naming

durwin · 10-25-2007, 01:35 PM

There is this entry in menuconfig.

CONFIG_SCSI_SAS_ATA:

Builds in ATA support into libsas. Will necessitate
the loading of libata along with libsas.

Symbol: SCSI_SAS_ATA [=n]
Prompt: ATA support for libsas (requires libata)
Defined at drivers/scsi/libsas/Kconfig:33
Depends on: SCSI && SCSI_SAS_LIBSAS && (ATA=y || ATA=SCSI_SAS_LIBSAS)
Location:
-> Device Drivers
-> SCSI device support
-> SCSI Transports
-> SAS Domain Transport Attributes (SCSI_SAS_LIBSAS [=m])

I tried it, but it did not show hd as sd.

hottdogg · 11-25-2007, 01:21 PM

This is one that still tickles me,unanswered mystery of linux kernel,lol...
maybe kernel hackers and linux uber-geeks know the answer.
Tried centos 5 and arch linux 2007.8 while ago, both use sdX for my pata harddisks.
Currently using slackware 12 with stock kernel 2.6.22 , uses hdX instead.
So slackware 12 still uses that mysterious legacy option, right? whatever...

it's nice if someone could give correct answer,though

--edit--
did some browsing,
getting clearer
but i'm still not sure which config option in .config.

jay73 · 11-25-2007, 02:31 PM

Hmm, it appears that Suse 10.3 has an option to select the desired mode. I actually wrote it down while installing but now I can't find it anymore.

Whether it will actually mean that you get hd instead of sd is something that I don't know. You will be able to access more than 15 partitions, though, which implies that it does behave like it did with the older driver.

hal8000b · 11-27-2007, 03:15 PM

Quote:

Originally Posted by jay73

Hmm, it appears that Suse 10.3 has an option to select the desired mode. I actually wrote it down while installing but now I can't find it anymore.

Whether it will actually mean that you get hd instead of sd is something that I don't know. You will be able to access more than 15 partitions, though, which implies that it does behave like it did with the older driver.

Hi, I can help you here as I multiboot Suse 10.3.
The libata library does indeed relabel any IDE hard drives from hdx to sdx, however in addition it places a limit of the first 15 scsi partitions.

This is of course useless if you have more than 15 partitions as anything after 15 is ignored.

The temporay fix for Suse 10 is to add
hwprobe=-modules.pata

to the boot prompt, or append the text to the end of your grub prompt, for a permanent solution.