0.7 performance, attack of the seek? [Was: Re: [DRBD-user] 0.6vs. 0.7 3ware performance? [Was: Expectedsyncspeed for a 425gbvolume?]]

Todd Denniston Todd.Denniston at ssa.crane.navy.mil
Tue Apr 12 19:00:36 CEST 2005

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Nate Carlson wrote:
> 
> On Thu, 7 Apr 2005, Todd Denniston wrote:
> > In the systems that have been having trouble getting the speed they want
> > out of 0.7, has anyone tried putting the metadata on a separate physical
> > disk (not in the same RAID either)?
> 
> I just attempted putting the metadata on a loopback device where the loop
> file was located in a tmpfs partition (no other physical devices available
> in these boxes), and get the same poor performance. Is that an adequate
> test?

I would have expected it to be sufficient, though I was not expecting DRBD
to work with a loop device.
-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane) 
Harnessing the Power of Technology for the Warfighter



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