Re: O_DIRECT for block device

[Avi Kivity]

Karthik Sarangan wrote:

> I have a scsi hdd configured at /dev/sdb.
>
> open("/dev/sdb", O_DIRECT) succeeds.
> A 'read' or 'write' returns -1 and errno is EINVAL.
>
> How to read and write data to it? They do not seem to work. I have a 
> 262144 byte buffer for data transfer.

make sure your buffer is aligned on a 512 byte boundary.
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