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On Fri, Apr 26 2013, Andrea Conti wrote: |
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> Hi, |
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> |
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>> EXT3-fs (sda5): error: couldn't mount because of unsupported optional |
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> features (240) |
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> |
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>> /dev/sda5 / ext4 noatime,discard 0 1 |
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> |
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> When first mounting the root filesystem the kernel has no access to |
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> /etc/fstab and therefore by default tries mounting it with all available |
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> FS drivers until one succeeds. ext3 (or ext4 in ext3 mode) is tried |
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> before ext4 and you get that error when it fails because the filesystem |
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> is using ext4-only features such as extents. |
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> |
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> You can avoid that by adding "rootfstype=ext4" to the kernel command line. |
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> |
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>> Since all my fs are ext4 I could remove ext3 support from the kernel |
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>> (3.5.4). Is that the recommended procedure? |
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> |
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> You can remove ext2/ext3 support even if you still have ext2/ext3 |
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> filesystems around; the ext4 driver is backwards compatible and can |
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> handle those with no problems. You just have to make sure that |
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> CONFIG_EXT4_USE_FOR_EXT23 is set in your kernel configuration. |
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> |
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> HTH |
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> andrea |
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Thanks. I didn't know about rootfstype. |
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allan |
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