On Fri, Apr 24, 2009 at 02:14:43PM -0400, Donald Williams wrote: > Have you tried increasing the disk readahead value? > #blockdev --setra X /dev/<multipath device> > > The default is 256. Use --getra to see current setting. > > Setting it too high will probably hurt your database performance. Since > databases tend to be random, not sequential.
I would think that the databases would open the disks with O_DIRECT bypassing the block cache (And hence the disk readahead value isn't used at all). --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
