On Mon, May 26, 2008 at 11:46:07PM +0200, Justin Albstmeijer wrote: > I'm setting up a redundant aoe target with drbd. > These two aoe target servers export both the same drbd device through > aoe at the same time using a drbd primary/primary setup. > > Initially I assumed I had to run the aoe (qoaed/vblade) in o_direct mode > to be sure all writes would be replicated realtime. > But is this really necessary? Is vblade or qaoed buffering writes? > Initial test show a big decrease in performance when using o_direct on > a drbd device... > I'm assuming the drbd buffers are also replicated...
Usually if vblade reads and writes to /dev/whatever, the Linux kernel's page cache will cache the data from /dev/whatever in RAM, so that writes are buffered, reads might be satisfied from RAM, etc. -- Ed L Cashin <[EMAIL PROTECTED]> ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Aoetools-discuss mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/aoetools-discuss
