On 2013-07-02, Randolph Maa?en <[email protected]> wrote:
> 2013/7/2 Grant Edwards <[email protected]>
>> I still haven't figured out why my drives suddenly started getting
>> discovered in varying orders. [...]
>>
>> It looks like my options are:
[...]
>
>> 5) For the drive with the root parition on it switch from a DOS
>> parition table to a GPT partition table and use the
>> root=PARTUUID=<whatever> kernel option.
>
> You don't need to switch to GPT for that.
All the references Google can find for me say that you have to use a
GPT partition table if you want to specify a boot partition using
root=PARTUUID=<partition-uuid>.
Does the root=PARTUUID option work for you?
Can you point to some documentation on how you can use
root=PARTUID=<partition-uuid> with an DOS/MBR partition table?
> I have a DOS partitioned disk and "blkid" prints the LABEL and UUID
> for each partition.
Anybody can write a program to gnerate and print a UUID for a
partition. What matters is what the _kernel_ thinks the partition
UUID is.
I added some printk() calls to the kernel mount code to print out the
parition UUIDs. They don't match the UUIDs printed by blkid:
kernel blkid
sector UUID UUID
sda1 64 0004c99d-01 66E1C3CF7C012A2E
sda2 209715264 0004c99d-02 e9a3eb9e-10d0-4075-aacf-018219cf77a3
sda3 211812416 <null> n/a
sda4 <n/a> <n/a> n/a
sda5 211812480 0004c99d-05 ab4724ab-9030-4217-8582-00f0abe1a48e
sda6 421527744 0004c99d-06 n/a
sda7 429916416 0004c99d-07 13c0fbde-db8a-4784-861a-b3f4e4cdd8f5
sda8 639631680 0004c99d-08 d0f87d87-002c-4d12-b5f3-193d9b0bebee
sda9 849346944 0004c99d-09 03c479f0-ecf8-4060-885b-b350368deee8
sda10 1059062208 0004c99d-0a 60acb3d3-ce8e-48ce-b197-858bc51a74ea
sda11 1268777472 0004c99d-0b n/a
sda12 1478492736 0004c99d-0c n/a
sda13 1688208000 0004c99d-0d n/a
sda14 1897923264 0004c99d-0e n/a
IOW, it appears that the "blkid" program is either just making stuff
up or its the filesystem UUID rather than the partition UUID. I
suspect the latter, since I notice that blkid doesn't print a UUID for
paritions that don't have filesystems.
One might think that one could use root=PARTUUID=0004c99d-06 instead
of root=/dev/sda5, but the kernel will reject any partition UUID
strings shorter than 36 characters.
--
Grant Edwards grant.b.edwards Yow! ... I see TOILET
at SEATS ...
gmail.com
