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

Matthias Schmidt matthias at
Mon Oct 4 23:34:39 PDT 2010

* Matthew Dillon wrote:
>     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 didn't try to do that :)  I just run "mkinitrd" to create a new
initrd, that's all.  According to the script it creates a 15 MB vn(4)

>     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.

Do not have the exact numbers here, but IIRC about 40GB.



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