harddisk support

harddisk support

[mdaljeet]

Hi,

I do not know whether I should ask this question on this mailing list, but
it definitely has to do either with the kernel confiuration or kernel
support.

In the '/dev' tree, the device file entries for SCSI harddisks ranges from
'/dev/sda' to '/dev/sdp'. If I attach 17 scsi harddisks to a system, the
17th harddisk is shown  as '/dev/sdq' in '/proc/partitions' but there is no
entry in the '/dev' tree. If I try to access '/dev/sdq' either through
fdisk or through   any other simple C programs, it gives error saying, can
not open device '/dev/sdq'.

How can I access more than 16 harddisks?

Regards,
Daljeet.

Re: harddisk support

[Andreas Dilger]

Daljeet writes:
> In the '/dev' tree, the device file entries for SCSI harddisks ranges from
> '/dev/sda' to '/dev/sdp'. If I attach 17 scsi harddisks to a system, the
> 17th harddisk is shown  as '/dev/sdq' in '/proc/partitions' but there is no
> entry in the '/dev' tree. If I try to access '/dev/sdq' either through
> fdisk or through   any other simple C programs, it gives error saying, can
> not open device '/dev/sdq'.
> 
> How can I access more than 16 harddisks?

Use the MAKEDEV script to make the extra /dev/sd* entries.  Like:

cd /dev; MAKEDEV sdq sdr sds sdt sdu sdv sdw sdx sdy sdz sdaa ...

You can make up to 128 SCSI disks, all the way to /dev/sddx.

Cheers, Andreas
-- 
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert

Re: harddisk support

[Bernd Eckenfels]

In article <CA256A72.001BA0E4.00@d73mta01.au.ibm.com> you wrote:
> How can I access more than 16 harddisks?
Create the Device File with:

cd /dev ; MAKEDEV sdq
-or-
cd /dev ; mknod sdq b 65 0
mknod sdq1 b 65 1
...