Panic while creating UFS fs on vn(4) for initrd

Matthew Dillon dillon at
Mon Oct 4 15:30:50 PDT 2010

    Hrm.  I don't think you can create an 8 TB UFS1 filesystem.  The
    limitation for UFS is 2TB, and even that might be a bit dangerous
    because ufs uses 32 bit filesystem block numbers.  Theoretically
    it is based on the UFS frag which is usually 1K or 2K, and negative
    block numbers are used to index meta-data, so (2^31) * 1K = 2TB.

    I don't quite know why it crashed... the VCHR is missing its cdev
    pointer (it is NULL for some reason), but it could be related to the
    size of the backing store you tried to create the UFS filesystem with.

					Matthew Dillon 
					<dillon at>

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