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On 2013-07-02, Randolph Maa?en <r.maassen60@×××××.com> wrote: |
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> 2013/7/2 Grant Edwards <grant.b.edwards@×××××.com> |
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|
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>> I still haven't figured out why my drives suddenly started getting |
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>> discovered in varying orders. [...] |
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>> |
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>> It looks like my options are: |
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[...] |
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> |
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>> 5) For the drive with the root parition on it switch from a DOS |
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>> parition table to a GPT partition table and use the |
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>> root=PARTUUID=<whatever> kernel option. |
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> |
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> You don't need to switch to GPT for that. |
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All the references Google can find for me say that you have to use a |
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GPT partition table if you want to specify a boot partition using |
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root=PARTUUID=<partition-uuid>. |
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Does the root=PARTUUID option work for you? |
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Can you point to some documentation on how you can use |
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root=PARTUID=<partition-uuid> with an DOS/MBR partition table? |
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> I have a DOS partitioned disk and "blkid" prints the LABEL and UUID |
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> for each partition. |
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Anybody can write a program to gnerate and print a UUID for a |
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partition. What matters is what the _kernel_ thinks the partition |
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UUID is. |
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I added some printk() calls to the kernel mount code to print out the |
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parition UUIDs. They don't match the UUIDs printed by blkid: |
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|
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kernel blkid |
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sector UUID UUID |
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|
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sda1 64 0004c99d-01 66E1C3CF7C012A2E |
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sda2 209715264 0004c99d-02 e9a3eb9e-10d0-4075-aacf-018219cf77a3 |
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sda3 211812416 <null> n/a |
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sda4 <n/a> <n/a> n/a |
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sda5 211812480 0004c99d-05 ab4724ab-9030-4217-8582-00f0abe1a48e |
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sda6 421527744 0004c99d-06 n/a |
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sda7 429916416 0004c99d-07 13c0fbde-db8a-4784-861a-b3f4e4cdd8f5 |
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sda8 639631680 0004c99d-08 d0f87d87-002c-4d12-b5f3-193d9b0bebee |
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sda9 849346944 0004c99d-09 03c479f0-ecf8-4060-885b-b350368deee8 |
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sda10 1059062208 0004c99d-0a 60acb3d3-ce8e-48ce-b197-858bc51a74ea |
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sda11 1268777472 0004c99d-0b n/a |
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sda12 1478492736 0004c99d-0c n/a |
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sda13 1688208000 0004c99d-0d n/a |
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sda14 1897923264 0004c99d-0e n/a |
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IOW, it appears that the "blkid" program is either just making stuff |
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up or its the filesystem UUID rather than the partition UUID. I |
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suspect the latter, since I notice that blkid doesn't print a UUID for |
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paritions that don't have filesystems. |
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One might think that one could use root=PARTUUID=0004c99d-06 instead |
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of root=/dev/sda5, but the kernel will reject any partition UUID |
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strings shorter than 36 characters. |
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-- |
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Grant Edwards grant.b.edwards Yow! ... I see TOILET |
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at SEATS ... |
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gmail.com |
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