Hi,
On Tue, 19 Oct 1999 20:12:20 -0700, "Tom Livingston" <[EMAIL PROTECTED]>
said:
>> Has anyone else tried raw-io with md devices? It works for me but the
>> performance is quite bad.
> This is a recently reported issue on the linux-kernel mailing list.
> The jist of it is that rawio is using a 512 byte blocksize, where raid
> assumes a 1024. This was only first reported a couple of days ago
> (10/16)
Yep. It's not clear just yet exactly how best to fix this --- the
hacked patch which forces the raw IO blocksize to 1024 will break
applications which (legitimately) expect to be able to perform 512-byte
IOs on the raw device. I'll let people know once we've figured out how
to get 512-byte IOs working on raid decently.
--Stephen
