On Wed, Mar 26, 2003 at 04:57:11PM -0800, Barton Robinson wrote: > Without PAV, having Linux issue 3 I/Os to the same physical > volume will NOT help performance. If one of those I/O must > be satisified by activity to a real disk, all of the remaining I/O > queued on the device will wait, even those with data residing > in cache who could be satisfied immediately.
(I think I'm just going to hire Alan Altmark to explain what I'm trying to say -- I can't seem to express myself very well these days. Alan seems to be good at explaining me...8-() My original point was to break up the big minidisks or full volumes into smaller pieces that you can move around to avoid the problem of blocking on a single I/O to a device. Since VM PAV support is still not in the cards, the technique does help simulate the same effect, and thus, is an improvement over fullpack minidisks or dedicated volumes. -- db
