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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 5 - Preparing Shared Storage

In the above, the emcpowera5 is bound with /dev/raw/rwa1 and /dev/raw/raw2 is bound with /dev/emcpowera6. These are SAN (EMC symmetrix) power-devices.

Size of such raw devices can be viewed in the file /proc/partitions. For example,

$ cat /proc/partitions | more
 232     0    8923200 emcpowera 268 0 536 190 0 0 0 0 0 190 140
 232     1          1 emcpowera1 4 0 8 0 0 0 0 0 0 0 0
 232     5    1028097 emcpowera5 18 0 36 20 0 0 0 0 0 20 20
 232     6    1028128 emcpowera6 22 0 44 10 0 0 0 0 0 10 10
 232     7    1028128 emcpowera7 22 0 44 10 0 0 0 0 0 10 0

The third field/column shows the Size of the device in KB. The column(1) represents the Major number and column(2) shows the minor number.

The actual size of partitions and the state of raw device bindings can also be determined using the following commands, respectively:

#fdisk l
#raw qa

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


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