Raw Devices 2006-10-09 - By C'est Pierre
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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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