[9fans] How to mount a P9 partition?

[Jonas Amoson]

Hello!

I am trying to access files that I have on a harddrive

on which the Plan 9 installation refuses to boot. I am

now booting from a new harddisk (sdC0) and would like

to mount the file system of the problematic disk (now

sdD0) in a directory (say /n/olddisk). I have succeeded

to mount CD:s (sdD1) by starting  9660srv and mounting

it from /srv:

9660srv -f /dev/sdD1/data

mount /srv/9660 /n/cdrom

My guess is that I have to start a file server in a similar

fashion, and it does not complain when I write:

fossil/fossil -f /dev/sdD0/fossil

I was expecting some new entry named /srv/fossil that I

could mount in a directory, but that does not seem to

how it works. Running "ls /dev/sd*" gives the following:

/dev/sdC0/9fat

/dev/sdC0/ctl

/dev/sdC0/data

/dev/sdC0/fossil

/dev/sdC0/nvram

/dev/sdC0/plan9

/dev/sdC0/raw

/dev/sdC0/swap

/dev/sdD0/9fat

/dev/sdD0/ctl

/dev/sdD0/data

/dev/sdD0/fossil

/dev/sdD0/nvram

/dev/sdD0/plan9

/dev/sdD0/raw

/dev/sdD0/swap

/dev/sdD1/ctl

/dev/sdD1/raw

/dev/sdctl

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[Iruata Souza]

fossil/fossil -f /dev/sdD0/fossil -c 'srv fossil'

this should post /srv/fossil as you want. then you can proceed to
mounting as you did with the cd.

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[Jonas Amoson]

> fossil/fossil -f /dev/sdD0/fossil -c 'srv fossil'

Thanks for the advice! It complained about security, and

have yet to learn how it works, but adding the option -A

after 'srv' made it happier. So what I wrote was:

fossil/fossil -f /dev/sdD0/fossil -c 'srv -A fossil'

mount /srv/fossil /n/olddisk

This seemed to work out very fine, but I soon relised that

the content of /n/olddisk now was the filesystem on sdC0,

instead of sdD0 as one might have expected?

/Jonas

<-----Ursprungligt Meddelande----->
  From: Iruata Souza [iru....@gmail.com]
Sent: 19/2/2010 3:48:35 PM
To: 9f...@9fans.net
Subject: Re: [9fans] How to mount a P9 partition? 

fossil/fossil -f /dev/sdD0/fossil -c 'srv fossil'

this should post /srv/fossil as you want. then you can proceed to
mounting as you did with the cd.

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[erik quanstrom]

> This seemed to work out very fine, but I soon relised that
> the content of /n/olddisk now was the filesystem on sdC0,
> instead of sdD0 as one might have expected?

if these are actually sata drives, without a detailed
motherboard manual or creative interpretation of the
silkscreening on the motherboard in addition to some
information on how bios is mapping sata ports, there's
no telling where you're drive will end up.

if you run in ahci mode, you can eliminate the bios
mapping problem. then you'll be back to the previous
situation where you only need to know how the ports on
the motherboard are numbered.

generally the motherboard manual will tell you which
ports are which. that failing, sometimes you can see enough
of the silkscreening to tell you which port is which.

- erik

[Jonas Amoson]

I interpret you as:

(1) the commands that I issued should work, at least

on some machines.

(2) the reason they don't work might depend on HW.

The machine is an old Dell Pentium III and the disks

are regular PATA-drives. I also tried to mount sdC0

with the same outcome.

/jonas

<-----Ursprungligt Meddelande----->
  From: erik quanstrom [quan...@quanstro.net]
Sent: 19/2/2010 6:01:57 PM

To: 9f...@9fans.net
Subject: Re: [9fans] How to mount a P9 partition? 

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