Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Thu, Nov 10, 2016 at 03:15:40PM +0000, pillai bs wrote: > On Tue, Nov 01, 2016 at 07:02:02AM +0000, pillai bs wrote: > > > Hi Experts, > > > > > > > > > Is there a possible way to monitor CPU Util for the drbd resource. > > > Actually am getting cent percent utilization even i dont have much > > > load. > > > > > > Am maintaining my setup with three blocks one for Data, other for > > > configurations and the other for logs which was logically mounted. > > > > DRBD version? > > My DRBD Version is "8.3.11 " You want to learn to quote. It will make your life in the 'net much easier. > %100 util does not mean it cannot take any more. "I aggree" > It only means that "most of the time" a new request is submitted before > previous requests have been completed, or maybe "back to back" with the > completion. > > Here "back to back" u meant it is synchronizing ?? No. I mean a new requet will be sumitted before previous requests have been completed, or immediately after, leaving no time for the device to be "idle". Nothing to do with resync. I tried to explain what "utilization" is in this context. > My question is > why the "drbd2" alone utilizing CPU more than drbd1/drbd0 > SInce it is logicaly mounted, why not the actual "dm-9" shows very minimal util of CPU. That "%util" column you see in iostat output is NOT cpu, but *device* utilization, and just measures the fraction of time the device has had "in-flight IO". Also, it is very likely that this is simply wrong, because the the "in-flight" counter looks wrong. Let's do this the other way around: * do you have any problems with performance, or just with those statistics, which are likely simply wrong? * do statistics improve, if you upgrade your DRBD to a version that is less than five years old? > Depending on usage patterns, and network and IO backend latencies, > 100% util may even be expected. -- : Lars Ellenberg : LINBIT | Keeping the Digital World Running : DRBD -- Heartbeat -- Corosync -- Pacemaker DRBD® and LINBIT® are registered trademarks of LINBIT __ please don't Cc me, but send to list -- I'm subscribed