On 24/04/2011, at 18:19, Andrey Chernov wrote:
> On Sun, Apr 24, 2011 at 09:23:08AM +0000, Alexander Motin wrote:
>> ATA device names in /etc/fstab or other places, make sure to update
>> them respectively (adX -> adaY, acdX -> cdY, afdX -> daY, astX -> saY,
>> - where 'Y's are the sequential numbers for each type in order of
>> - detection, unless configured otherwise with tunables, see cam(4)).
>> + where 'Y's are the sequential numbers starting from zero for each type
>> + in order of detection, unless configured otherwise with tunables,
>> + see cam(4)).
>
> Is there any way to guess resulting 'Y' numbers _before_ booting new
> kernel? I have remote machine with console access almost impossible (very
> hard for me).
>
> It seems something like
> vfs.root.mountfrom="ufs:/dev/ada0s1a ufs:/dev/ada1s1a ..."
> (up to max channels) helps to find root, but what about other mounted
> disks?
The best way is to change to use GPT IDs (/dev/gptid/xxx) if you are on a GPT
system) or UFS IDs (/dev/ufsid/xxx) if you can't.
gpart list will show the GPTID (rawuuid) and dumpfs will show the UFS ID.
The following shell snippet will generate the UFS ID for a given FS.
getfsid() {
line=`dumpfs 2> /dev/null $1 | head | grep superblock\ location`
if [ $? -ne 0 ]; then
return 1
fi
# dumpfs doesn't print leading 0s
eval `echo $line | sed -nEe 's/superblock location.*id.*\[ (.*) (.*)\
]/printf %0x $((0x\1 << 32 | 0x\2))/p'`
}
--
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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