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(itstool) path: sect3/para
892/8920
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At the prompt asking for a root file system to mount, any device that contains a valid root file system can be entered. If <filename>/etc/fstab</filename> is set up correctly, the default should be something like <literal>ufs:/dev/gvinum/root</literal>. A typical alternate choice would be something like <literal>ufs:da0d</literal> which could be a hypothetical partition containing the pre-<filename>vinum</filename> root file system. Care should be taken if one of the alias <literal>a</literal> partitions is entered here, that it actually references the subdisks of the <filename>vinum</filename> root device, because in a mirrored setup, this would only mount one piece of a mirrored root device. If this file system is to be mounted read-write later on, it is necessary to remove the other plex(es) of the <filename>vinum</filename> root volume since these plexes would otherwise carry inconsistent data.
Only Primary Bootstrap Loads
If <filename>/boot/loader</filename> fails to load, but the primary bootstrap still loads (visible by a single dash in the left column of the screen right after the boot process starts), an attempt can be made to interrupt the primary bootstrap by pressing <keycap>space</keycap>. This will make the bootstrap stop in <link xlink:href="@@URL_RELPREFIX@@/doc/en_US.ISO8859-1/books/handbook/boot.html#boot-boot1">stage two</link>. An attempt can be made here to boot off an alternate partition, like the partition containing the previous root file system that has been moved away from <literal>a</literal>.
Nothing Boots, the Bootstrap Panics
This situation will happen if the bootstrap had been destroyed by the <filename>vinum</filename> installation. Unfortunately, <filename>vinum</filename> accidentally leaves only 4 KB at the beginning of its partition free before starting to write its <filename>vinum</filename> header information. However, the stage one and two bootstraps plus the bsdlabel require 8 KB. So if a <filename>vinum</filename> partition was started at offset 0 within a slice or disk that was meant to be bootable, the <filename>vinum</filename> setup will trash the bootstrap.
Similarly, if the above situation has been recovered, by booting from a <quote>Fixit</quote> media, and the bootstrap has been re-installed using <command>bsdlabel -B</command> as described in <link xlink:href="@@URL_RELPREFIX@@/doc/en_US.ISO8859-1/books/handbook/boot.html#boot-boot1"/>, the bootstrap will trash the <filename>vinum</filename> header, and <filename>vinum</filename> will no longer find its disk(s). Though no actual <filename>vinum</filename> configuration data or data in <filename>vinum</filename> volumes will be trashed, and it would be possible to recover all the data by entering exactly the same <filename>vinum</filename> configuration data again, the situation is hard to fix. It is necessary to move the entire <filename>vinum</filename> partition by at least 4 KB, in order to have the <filename>vinum</filename> header and the system bootstrap no longer collide.

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(itstool) path: sect3/para
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