On Wed, Nov 14, 2007 at 08:59:27AM +0100, [EMAIL PROTECTED] wrote: > On Tue, Nov 13, 2007 at 02:03:54PM +0000, Bruce McAlister wrote: > > [EMAIL PROTECTED] wrote: > > > Hello, > > > > > > we are using hardware array and its vendor recommends the following > > > setting in > > > /etc/system: > > > set sd:sd_max_throttle = <value> > > > or > > > set ssd:ssd_max_throttle = <value> > > > > > > > To find out a little more of what this feature does, have a read here: > > > > http://www.opensolaris.org/jive/thread.jspa?threadID=12523&tstart=0 > > Thank you for the url. There is even more at: > http://forums.hds.com/index.php?showtopic=528&hl=sd_max_throttle > > I am looking for a way to monitor how it influences the whole io traffic. > The same way as when using ufs_LW/ufs_HW. When number of writes exceed > value of ufs_HW, the writes are deffered until only ufs_LW bytes are > outstanding _and_ (what is more important !) the kernel variable > ufs_throttles is increased. Maybe there is something similar in sd > driver world ? > > Or to put it simply: can I monitor (s)sd queue (number of waiting > requests in queue) using DTrace ?
Or to make it even simplier: I would like to monitor all (or most ?) events described at http://wikis.sun.com/display/StorageDev/The+Solaris+OS+Queue+Throttle Or at least to monitor how IO requests are getting into (sd) queue for specyfic LUN, how long is queue at the moment, when IO is removed from queue, etc. I belive it is possible (what is impossible for DTrace ? ;-)) ) but ... Regards przemol -- http://przemol.blogspot.com/ ---------------------------------------------------------------------- Zobacz ocenzurowany wywiad z Jaroslawem Kaczynskim! Kliknij >>> http://link.interia.pl/f1c4c _______________________________________________ dtrace-discuss mailing list [email protected]
