sslug-teknik team mailing list archive

[Frank Damgaard <frda@xxxxxx>]

On Tue, Sep 03, 2002 at 10:03:34 +0200, Jesper Wisborg Krogh wrote:

> >Måske - har du support for SCSI tape-drev i din kerne ? Prøv
> >"modprobe st".
> >
> Det lader til, at det er problemet. modprobe giver bare et blankt svar.

Det er normalt. "modprobe" skriver kun noget ved fejl.
(faktisk mange kommandolinier programmer skriver kun noget ved
 fejl)

Brug "lsmod" til at se om st modulet er loadet.


> >Hvad siger output fra "cat /proc/scsi/scsi" efter den kommando ?
> >
> Den lister kun cd-rom drevet. Igen en indikation, at det kræver en 
> rekompilering af kernen.

Du har vel huske at sætte Device-ID på tapedrever til passende
værdi, og terminere korrekt på din SCSI bus osv...
Husk at hvis tapedrevet er slukket ved load af scsi modul (ofte ved boot)
så vil tape drevet ikke findes i listen.
Enten hav den tændt ved boot eller brug i så fald en rescan af SCSI bus. 
(Se SCSI programming Howto) .

...snip.. (SCSI programming Howto).....
  4.3.1.  Dynamically insert and remove SCSI devices

  If a newer kernel and the /proc file system is running, a non-busy
  device can be removed and installed 'on the fly'.

  To remove a SCSI device:

       echo "scsi remove-single-device a b c d" > /proc/scsi/scsi

  and similar, to add a SCSI device, do

       echo "scsi add-single-device a b c d" > /proc/scsi/scsi

  where

             a == hostadapter id (first one being 0)
             b == SCSI channel on hostadapter (first one being 0)
             c == ID
             d == LUN (first one being 0)

  So in order to swap the /dev/sgc and /dev/sgd mappings from the
  previous example, we could do

       echo "scsi remove-single-device 0 0 4 0" > /proc/scsi/scsi
       echo "scsi remove-single-device 0 0 5 0" > /proc/scsi/scsi
       echo "scsi add-single-device 0 0 5 0" > /proc/scsi/scsi
       echo "scsi add-single-device 0 0 4 0" > /proc/scsi/scsi

  since generic devices are mapped in the order of their insertion.

  When adding more devices to the scsi bus keep in mind there are
  limited spare entries for new devices. The memory has been allocated
  at boot time and has room for 2 more devices.

...snip....


-- 
mvh Frank Damgaard  |