If you don't have a filesystem there shouldn't be a buffer cache to deal
with, but you could always open("/dev/sdaf", O_DIRECT);
You'll be responsible for your own seeking and stuff to get to the right
place.
(also see deprecated man 8 raw)
On 7/17/2012 11:28 AM, Andrew Hume wrote:
i have two linux servers each of which has the same piece of SAN
attache dto it as a LUN. that is, svra:/dev/sdbd is the same volume
(or more exactly WWN) as svrb:/dev/sdaf.
what i want to do is write something on svra to /dev/sdbd
and then be able to read it on svrb from /dev/sdaf.
in principle this should work, but on Linux the buffer
cache always inserts doubt. how do i reliably probe
/dev/sdaf for new content? there is no filesystem involved;
i am just talking about raw disk blocks.
thanks in advance.
andrew
------------------
Andrew Hume (best -> Telework) +1 623-551-2845
[email protected] <mailto:[email protected]> (Work) +1
973-236-2014
AT&T Labs - Research; member of USENIX and LOPSA
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