Hi Pierre,
just personal curiosity: what's the advantage to have 47 partition on the
same disk?
If you are still using the ASM then you can simply use a single partition
(or device).
Tablespaces are already divided inside that device optimizing the space
usage.

Regards
Fabrizio

On 10/9/06, C'est Pierre <cestpierre@(protected):
>
> Hello all,
>
> First, I am sys-administrator, not a DBA, so excuse me if I am no
> precise with some tech. aspects of Oracle.
>
> I am in the process of installing a new RAC cluster. Our previous one,
> went smoothly, but we used ASMLib, which we aren't using now. Problem:
> I created 47 partitions on a scsi disk presented to the server thru a
> fibre channel card. These are sda1 thru sda47. However, only the 15
> first (except one, which is the extended one - sda4) are usable.
>
> I wrote the /etc/raw, mapping sda's to raw's just as the dba sugested
> for organizational purposes (they aren't sequential, e.g raw51 maps
> to sda28).
>
> I then made this line of bash to create all device nods that weren't
> there (and even those that were...just in case):
>
>   for i in `seq -f %g 1 47`; do echo mknod sda$i b 8 $i ; done
>
> Problem: I can't access past sda16, I get this error:
>
> dd: opening `/dev/sda16': No such device or address
>
> when I look at dmesg and /proc/partitions, I only get to see the first
> 15 partitions there (or 16, if you count with 'sda')
>
> sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 sda9 sda10 sda11 sda12
> sda13 sda14 sda15 >
>
> I've googled for this problem and it seems there's a limitation on
> scsi disks of 16 partitions per device. Is this true? if so, what is
> the solution for this problem? how can I make 47 raw partitions?
>
> I can still ask our storage administrator to divide this disk into
> several disks and then we will group partitions 16 partitions on each,
> but this isn't a good solution. Another alternative solution which our
> dba presented, was adding ocfs 2 support and make it dance with the
> devil by the pale moonlight ;-)
>
> Let me know your thoughts and especially solutions!!
>
> Also, your thoughts on ocfs or not as a side note would be apreciated.
>
> Thank you
>
> Pierre
>
> P.S: I'm not french but I love french bread! ;)
>
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