Mounting a raw partition

[aballant]

Hi,

I need to urgently mount a raw fs partition. I've tried the following...


>mount -F raw /dev/rdsk/c2t1d0s2 /cemf/db
mount: operation not applicable to FSType raw

also

>mount /dev/rdsk/c2t1d0s2 /cemf/db
mount: operation not applicable to FSType raw

> mount /dev/rdsk c2t1d0s2 /cemf/db
Usage:
mount [-v | -p]
mount [-F FSType] [-V] [current_options] [-o specific_options]

All fail, any help please,

cheers,
Andrew



cheers,
Andrew

 

[julianbarnett]

I don't really get what you are trying to do. Mount is only applicable to partitions that have had filesystems created on them. Raw partitions are just that - areas of native disc accessed directly by an application, usually a DB, bypassing the OS idea of a filesystem.

The term raw device on the other hand is not the same thing - it is simply the way the OS sees he disk as buffered on unbuffered, dsk versus rdsk. Mount in your example is failing because it does not work on the raw device - you need to use .../dsk/... e.g. mount /dev/dsk/c2t1d0s2 /cemf/db. However this will also fail if a filesystem has not been constructed on the underlying partition.

The only utilities I can think of that will work on raw paritions access it at the block level - e.g. dd to copy data from one disk to another or to tape.

 

[julianbarnett]

I guess this is a Cisco EMF Objectstore databes from the name - in that case the release notes specifically warn against attempting to mount the device.

"Note: The disk where you create the raw partition should not be mounted. ObjectStore requires that the device is not referenced in /etc/vfstab, commenting out the line with the device is not enough. Consult your Systems Administrator if you are not sure how to do this."

 

[aballant]

Hi Julian,

Thanks this has completely answered my question,


many thanks,
Andrew


cheers,
Andrew